Krell Industries Stereo Amplifier EVOLUTION TWO MONAURAL PREAMPLIFIER User Manual

EVOLUTION

EVOLUTION TWO

MONAURAL PREAMPLIFIER

OWNER’S REFERENCE

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Contents

List of Illustrations, page iv

A Letter from Dan D’Agostino, page 1

SECTION ONE: About Krell, page 3

The Krell Legacy, Revolutionary Krell CAST Technology,

Ensuring Maximum Performance, Definition of Terms

SECTION TWO: Unpacking and Placement, page 11

Opening the Evolution Two Shipping Carton

SECTION THREE: Quick Start, page 13

Connecting the Evolution to Your System,

Operating the Evolution Two

SECTION FOUR: Anatomy of an Evolution Two, page 15

Front Panel Description, Remote Control Description,

and Back Panel Description

SECTION FIVE: Connecting the Evolution Two to Your System, page 26

Input and Output Connections, Connection Steps,

Connections Using CAN Link

SECTION SIX: Evolution Two Operation, page 29

On/Off and Stand-by Operation, Play and Record,

Operation Using CAN Link

SECTION SEVEN: Customizing the Evolution Two, page 32

Navigation Conventions, Menu Functions

SECTION EIGHT: Questions and Answers, page 49

Troubleshooting System Noise

APPENDIX: CAN Link and Multiple Evolution Two Preamplifiers, page 51

WARRANTY, page 53

RETURN AUTHORIZATION PROCEDURE, page 55

SPECIFICATIONS, page 56

iii

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List of Illustrations

Figure 1, page 15

Evolution Two Preamplifier Chassis and

Power Supply Chassis Front Panels

Inset Evolution Two Preamplifier Channel: Front Panel View

Figure 2, page 16

Evolution Two Remote Control

Figure 3, page 22

Evolution Two Preamplifier Chassis and

Power Supply Chassis Back Panels

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A Letter from Dan D’Agostino

Dear Audio Enthusiast,

Thank you for your purchase of the Evolution Two preamplifier.

My new Evolution products represent a watershed in my design philosophy and in

my quest for audio components that deliver absolute truth in music reproduction.

The expanse of the Evolution Two monaural design has allowed me to explore

fully the advantages of current mode topologies. The resulting circuit utilizes no

feedback and has a bandwidth of 2 MHz.

I have always been fascinated by the artistry inherent in great musical performanc-

es, and my new Evolution Two preamplifier delivers the these performances in

their entirety, unaltered, to the amplifier. At the same time, the Evolution Two pre-

amplifier provides the flexibility and control necessary for the listener to thoroughly

enjoy a high performance audio system. It is my pleasure to make the Evolution

products available to you.

The preamplifier plays a vital role in audio playback. At no other point in the repro-

duction process is the music so vulnerable to change. The signal level at the pre-

amplifier stage is small, and is particularly susceptible to noise and distortion. In

order to solve this problem, the Evolution Two employs Krell Current Mode gain

stages from input to output, and Current Audio Signal Transmission (CAST)

receivers and transmitters. Unprecedented in Krell design history, these unique

topologies combine in the Evolution Two preamplifier to form a circuit that has no

audible sonic signature.

The Evolution Series represents a new direction for Krell, where breakthrough cir-

cuit topologies also represent the vanguard in convenience and control. Sophisti-

cated communication circuitry allows from two to eight preamplifiers to be linked

to a single master from which all user interface is accomplished. The Evolution

Two Monaural Preamplifier is designed to complement perfectly the Evolution One

Monaural Power Amplifier. Combine the Evolution One and Two with my new

LAT-1000 loudspeakers, and experience the extraordinary capabilities of an

Evolution System.

continued

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(A Letter from Dan D’Agostino continued)

I have some exciting news for you. Work on a new source component for the

Evolution Series is ongoing as of this writing. Possessed of the unique Evolution

technologies that power the amplifier and preamplifier, this Evolution source will

expose the real advantages of the latest recording formats while taking compact

disc playback to the next level. I encourage you to audition it as soon as it is

released.

Sincerely,

Daniel D’Agostino

Chief Executive Officer

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SECTION

ONE

About Krell

This section describes the Krell Legacy, the innovative features and technology of

the Evolution Two, and defines CAST and other key terms used in this reference.

The Krell Legacy

“I design every Krell component to set the standard

for workmanship, style, and performance.”

Dan D’Agostino

High-end audio is a demanding pursuit—an ongoing quest for excellence in music

reproduction that drives equipment manufacturers to strive for the absolute in

design and performance. With a keen understanding of this passionate drive, Krell

Industries, Inc., was founded in 1980.

Over the past 2-1/2 decades, Krell has earned a distinguished reputation for engi-

neering innovation and product excellence. The company’s history is replete with

product introductions that have deeply impacted the high-end audio industry. The

most discriminating audiophiles and product reviewers have consistently recog-

nized Krell components for standard-setting performance.

From the company’s inception to the present, Krell C.E.O. Dan D’Agostino has

continually “pushed the envelope” of performance in audio. His exploration of new

technologies, driven by his never-ending quest to elevate the standard of excel-

lence, has resulted in breakthrough audio designs. Evolution Two preamplifiers

build on this Krell legacy.

Dan D’Agostino remains committed to the development of new designs and tech-

nologies. And the Krell legacy will continue to evolve with products that deliver

innovative engineering, perfection in build quality, and outstanding audio perform-

ance.

continued

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(SECTION ONE: About Krell continued)

Revolutionary Krell CAST Technology

Current Audio Signal Transmission, termed CAST, is a revolutionary method of

connecting analog audio components for unparalleled sonic performance.

Innovative engineering combines the new Krell CAST circuitry with existing Krell

Current Mode technology to create entire CAST systems that reproduce music

with incredible range, tonality, and precision.

The Voltage Signal Transmission

and the Traditional Audio System

Traditionally, signal is transmitted in the voltage domain between two components.

In an audio system, each component is a discrete entity with unique characteris-

tics that act upon the musical signal independently. Each component is unaware

of the other components in the system. The cables that connect the components

also have their own electrical characteristics, which affect the sonic presentation

of the entire system. CAST transmission unifies individual components and inter-

connects into an electrically linked whole. The original signal remains unaltered

from source to speaker.

CAST Basics

Here is how a CAST audio system works. Internally, each CAST source transfers,

or amplifies, current using Krell Current Mode circuitry. This current signal is then

output using CAST circuitry. When the signal is received by a CAST input, Krell

Current Mode circuitry again takes over until the signal reaches the loudspeaker.

By maintaining the musical signal in the current domain from beginning to end, an

entire CAST system behaves as if it is one component. With CAST, circuit board

properties and signal transmission aberrations between components are eliminat-

ed. Cable impedances and their effects on the transmitted signal are non-existent.

How CAST and Krell Current Mode Interact

While CAST is a new method of transferring the musical signal between compo-

nents, its origin stems from Krell Current Mode, the technology developed to

transfer the musical signal within a component. CAST combined with Krell Current

Mode takes circuitry signal transmission to the next evolutionary level. In essence,

Krell Current Mode maintains the integrity of the signal within the component and

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CAST preserves the transmitted signal between components. Together, CAST and

Krell Current Mode technologies unify separate Krell components into a single

global circuit. Krell Current Mode technology enjoys bandwidth increases up to an

order of magnitude greater than their voltage based counterparts. This dramatic

increase in circuit bandwidth delivers near perfection in the audible band that typi-

cally suffers from phase distortions in voltage circuits.

CAST Cable Construction

A CAST system uses cables manufactured by Krell and other manufacturers spe-

cially licensed by Krell. Thin and flexible CAST cables are constructed with the

same build quality as other Krell components and are aesthetically matched to the

components that Krell manufactures. An all-metal body and locking connectors

with gold contacts are part of the standard no-compromise specification devel-

oped for every CAST cable made.

Evolution CAST

By employing radical current mirror circuitry, the Evolution components elevate the

CAST technology to another level. This advanced use of the technology increases

the linearity, transient speed, and bandwidth of the Evolution components while

reducing the distortion by an order of magnitude.

The Best Musical Performance

When you operate a CAST system, you will hear significant improvements in every

performance area: speed, precision, dynamic range, depth and width of the sound

stage, transient impact, tonal balance, harmonic distortion, and more. The goal for

CAST is the same company goal used for all Krell products. Krell strives for the

delivery of the best performance of a musical event for you, using the full expres-

sion of technology to date.

continued

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(SECTION ONE: About Krell continued)

Ensuring Maximum Performance

“My pursuit of excellence in sound reproduction and

my love of great musical performance fuels the ongoing

Evolution design effort at Krell.”

Dan D’Agostino

The product of breakthrough Krell technology, the Evolution Two Monaural

Preamplifier works in tandem with the Evolution One Monaural Power Amplifier to

provide a sound that is supremely dynamic and musical. Indeed, it is the sound of

the music itself.

Core Technologies

Zero Feedback Balanced Current Mode Design

The signal path is fully complementary and fully balanced from input to output. All

transistors operate in Class A mode. CAST inputs drive a newly designed current-

mode balanced input stage, which uses a unique topology able to reject com-

mon-mode input noise over an unusually wide bandwidth.

Single-ended and balanced inputs drive a dynamically-cascoded JFET buffer,

which has tremendous open-loop linearity and very high input impedance, to elim-

inate loading effects. The voltage signals are then converted into balanced current

signals, the form in which they remain through the remainder of the signal path.

The audio signal remains in the current domain throughout the entire preamplifier.

Only at the single-ended and voltage outputs is it converted back to the voltage

domain.

All signal gain is realized in the current domain using proprietary multiple-output

current mirrors with nearly 500 times the open loop linearity of other designs.

Negative feedback is not used anywhere in the Evolution Two preamplifier, nor is it

necessary. Open-loop distortion is typically less than 0.005% (50 parts per mil-

lion), and the open loop bandwidth extends to two megahertz. The result is an

extraordinarily wide and deep image, with an open, effortless sound.

The signal switching relays are hermetically sealed and use gold-plated bifurcated

contacts for maximum signal integrity. Where needed multiple relays are connect-

ed in a “T” configuration to virtually eliminate crosstalk from unselected inputs.

The volume setting can be adjusted and displayed either numerically, from 0 to

151, or in dB, from –inf to +12.0 dB.

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Fully Balanced Discrete Volume Control

The volume control is realized with a 16-bit balanced resistor ladder, which uses

low-resistance, high-linearity solid-state switches and discrete precision resistors.

Control signals for the switches are optically coupled for low noise and maximum

signal integrity. The bandwidth and transient response of the preamplifier circuitry

are virtually unaffected by the volume setting. As a result high frequencies sound

especially smooth and extended, and music seems to emerge from “jet black”

silence. The analog and digital signal paths are not interconnected. Where neces-

sary, digital control signals are optically coupled to analog circuits.

The Evolution Two has two buffered tape outputs: one linked to the main signal-

selection bus, and another with its own independent signal-selection bus. This

allows the option of listening to one source while recording another, or the option

of connecting two tape decks having different input signals. Both tape outputs

have single-ended and voltage outputs. Either the fourth single-ended input or the

third balanced input can be user-configured as a tape monitor input, allowing the

opportunity to use home or professional recording equipment.

Separate Power Supply

Housed in a separate chassis, the power supply makes use of extensive electrical

and magnetic shielding to keep radiated interference out of critical preamplifier cir-

cuits. Internal line conditioning circuitry filters RF noise on the AC power, and

compensates for asymmetric power waveforms and DC on the mains.

Power for the analog stages comes from a large 170 VA toroidal transformer. This

transformer drives four 8-amp bridge rectifiers and 39,600 microfarads of filter

capacitance. Each monaural preamplifier has as much power supply capability as

many stereo power amplifiers.

The main regulators for the analog stages are scaled-down versions of those used

to power the output stages of the Evolution One amplifier. Operating in current

mode, with fully complementary gain stages and output drivers, wide bandwidth,

low output impedance, and high current capability, the main regulators easily

exceed the requirements of the analog stages. The driver and output stages in the

main analog regulators use five pairs of 150 Volt, 8 Amp, 40 megahertz power

transistors.

A dedicated 90 VA toroidal transformer with three independent secondary wind-

ings powers the preamplifier's digital control circuitry. The regulators for the con-

continued

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(SECTION ONE: About Krell continued)

(Separate Power Supply continued)

trol circuitry team ultra-stable voltage reference chips with the same discrete high-

current driver and output transistors used in the main analog regulators. These

ample power reserves are brought to the Evolution Two via high reliability 12-pin

connectors with machined, gold plated, three-amp contacts.

Secondary voltage regulators for each analog stage in the Evolution Two provide

ultra-quiet, rock-solid supply rails, as well as complete isolation between all the

analog stages.

When the Evolution Two is placed in stand-by, all the analog circuitry continues to

operate at the same bias current; however, the main analog supply voltages

decrease by 30 percent. The result is a corresponding 30 percent reduction in

power consumption and heat without the need to wait for the electronics to

“warm up” before listening.

Advanced Microprocessor Control

and Custom Software

A user menu allows extensive customization of the preamplifier operation, includ-

ing (but not limited to) input names, input-specific gain trims, Theater Through-

put™, display brightness, and 12-volt triggers. Integration is supported via RS-

232,12 Volt trigger, and RC-5 inputs, as well as an IR transmitter for programming

a learning remote control.

A built-in digital network allows multiple preamplifiers to be linked together, blend-

ing the convenience of a single-chassis stereo preamplifier with the sonic perform-

ance obtainable only from individual monaural preamplifiers. Six or more preampli-

fier channels can be “daisy-chained” together and controlled simultaneously for

multi-zone or home theater applications. The digital link allows the user settings in

one preamplifier channel to be conveniently “cloned” to other linked preamplifier

channels. Similarly, upgraded software in one preamplifier channel can be installed

in other preamplifier channels using the digital link.

In the event that the DC level at any of the preamplifier channel outputs exceeds a

nominal level, sophisticated protection circuitry safely mutes the outputs, traces

the source of the excess DC, and displays a diagnostic message on the main dis-

play. On power-up, the microprocessor verifies that all the circuit boards in the

preamplifier channel are properly connected and are compatible with the version

of software installed.

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Definition of Terms

Following are the definitions of key terms used in this owner’s reference.

Configurations

CAN Link

The communication system that links multiple Evolution Two preamplifier channels

is a sophisticated system called a controller area network (CAN).

Linked Mode

In linked mode, functions including power, volume, balance, phase, record, mute,

and input selections are instantaneously transmitted between linked preamplifier

channels. Evolution Two preamplifiers use CAN Link to operate in linked mode.

Clone

A method of transmitting custom configurations between linked preamplifier chan-

nels.

Inputs and Outputs

Balanced

A symmetrical input or output circuit that has equal impedance from both input

terminals to a common ground reference point. The industry standard for profes-

sional and sound recording installations, balanced connections have 6 dB more

gain than single-ended connections and allow the use of long interconnect cables.

Balanced connections are completely immune to induced noise from the system

or the environment.

CAST and Evolution CAST

Krell Current Audio Signal Transmission, or CAST, is a proprietary Krell circuit tech-

nology for connecting analog components, transmitting the audio waveform

between components in the current domain rather than in the voltage domain. The

speed and bandwidth provided by Krell CAST and its circuitry update, Evolution

CAST, yield accurate, realistic music reproduction, enabling connected compo-

nents to perform as if they are all part of a single circuit.

Single-ended

A two-wire input or output circuit. Single-ended connections are not recommend-

ed for connections requiring long cable runs. Use care when using single-ended

connections, because the ground connection is made last and broken first. Turn

the system off/on prior to making or breaking single-ended connections.

continued

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(SECTION ONE: About Krell continued)

Preamplifier

Channel

Also termed preamplifier or preamplifier channel. A channel is one Evolution Two,

comprised of one preamplifier chassis and one power supply chassis.

Right-terminated channel

Any right preamplifier channel that is last in a chain of linked Evolution preampli-

fiers is referred to as right-terminated. There is only one RG-45 link cable connect-

ed to a right-terminated channel.

Transmitter

Also termed transmitter preamplifier. The transmitter is a right-terminated preampli-

fier channel that sends IR, RC-5, and RS-232 data to the other linked preamplifier

channel(s), or receiver(s).

Receiver

Also termed receiver preamplifier. Receivers are linked preamplifier channels that

receive IR, RC 5, and RS-232 data from a right terminated preamplifier channel, or

transmitter.

Operation

Off

When the stand-by/power LEDs and the backlight grid are not illuminated, the pre-

amplifier is off.

Stand-by

A low power consumption status that keeps the audio and regulator circuits at

idle. The stand-by/power LEDs are illuminated in red, when the preamplifier chan-

nel is in the stand-by mode. Krell recommends leaving the preamplifier in the

stand-by mode when it is not playing music.

Operation

When the backlight is illuminated in blue, the preamplifier is in the operational

mode and ready to play music.

Technology

Krell Current Mode

A proprietary Krell circuit topology in which the audio gain stages of a component

operate in the current rather than voltage domain. This unique technology provides

the component with exceptional speed, and a wide bandwidth.

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SECTION

TWO

Unpacking and Placement

This section describes the procedures for safely unpacking and placing your

Evolution Two Monaural Preamplifier. Each Evolution Two preamplifier channel is

shipped in 1 carton consisting of 2 chassis: 1 power supply chassis and 1 pream-

plifier chassis.

Opening the Evolution Two Shipping Carton

Each Evolution Two shipping carton measures 22.3 in. (56.6 cm) wide by 23.5 in.

(59.7 cm) high by 16.2 in. (41.1 cm) deep.

Preamplifier Chassis. Each preamplifier chassis measures 17.3 in. (43.8 cm) wide

by 3.7 in. (9.5 cm) high by 18.5 in. (47 cm) deep, and weighs 21 lbs. (9.5 kg).

Power Supply Chassis. Each power supply chassis measures 17.3 in. (43.8 cm)

wide by 3.7 in. (9.5 cm) high by 17.3 in. (43.8 cm) deep, and weighs 31 lbs.

(14 kg).

Left/Right Channel Orientation

Evolution Two preamplifier channels are assembled as left or right channels.

Preamplifier RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier

channels are assembled with white RCA connectors, and right preamplifier chan-

nels are assembled with red RCA connectors.

To Remove the Preamplifier Channel

from the Shipping Carton

1. Open a shipping carton and remove the top layer of foam. You see these

items:

1 Evolution Two preamplifier chassis

1 Evolution Two power supply chassis

1 AC Power cord

1 12-pin DC cable

1 RJ-45 control cable

1 remote control

2 AAA-size 1.5 Volt batteries for the remote

1 T-10 Torx wrench for the remote control

1 packet containing the owner’s reference and warranty card

continued

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(SECTION TWO: Unpacking and Placement continued)

(To Remove the Preamplifier from the Shipping Box continued)

2. Carefully remove the preamplifier chassis, power supply chassis, and acces-

sories from the box.

3. Place the the preamplifier chassis and power supply chassis in a safe location

and remove the protective plastic wrapping.

4. Place the power supply chassis where you intend to use the assembled pre-

amplifier.

Krell recommends that you place the preamplifier chassis on top of the power

supply chassis. You can make 2 identical preamplifier/power supply stacks, as

individual left and right channels, or one 4-chassis stack, with both channels

combined in one stack.

5. Repeat Steps 1-5 for the remaining preamplifier channel(s).

Placement

Before you install an Evolution Two preamplifier into your system, please follow the

guidelines in this section to select a location for your component. This will facili-

tate a clean, trouble-free installation.

The Evolution Two preamplifier does not require a special rack or cabinet for

installation. Each preamplifier channel measures 17.3 in (43.8 cm) wide by 7.3 in.

(18.5 cm) high by 18.5 in. (47 cm) deep.

The Evolution Two preamplifier requires at least 2 inches of clearance on each side

and at least two inches of clearance above the component to provide adequate

ventilation. Installation inside cabinetry may require additional ventilation.

AC Power Guidelines

The Evolution Two preamplifier has superb regulation and does not require a dedi-

cated AC circuit. Avoid connections through extension cords or multiple AC

adapters. High quality 15 amp AC strips are acceptable. The use of AC line condi-

tioning devices is not recommended. The features provided by these devices are

already on board the Evolution Two. For more information, see Separate Power

Supply, on page 7.

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SECTION

THREE

Quick Start

To access the full array of available functions for the Evolution Two Monaural

Preamplifier, please read the entire owner’s reference manual. The abbreviated

routine in this Quick Start section will allow you to connect and operate the

Evolution Two quickly and enjoy its basic functions.

Evolution Two preamplifier channels may be operated independently, or they may

be operated in linked mode, using CAN Link.

Connecting the Evolution Two to Your System

Position each power supply and preamplifier chassis where you intend to use

connected channels. Do do not move the chassis after they are connected.

1. Connect the power supply chassis and the preamplifier chassis with the 12-pin

DC cable provided, using the DC power connectors (47) on the back panels

(1-2).

IMPORTANT

Never connect two power supplies together.

2. In order to operate the Evolution Two preamplifier in linked mode, connect the

preamplifier channels together with the supplied RJ-45 control cable. In linked

mode, functions including power, volume, balance, phase, record, mute, and

input selections are instantaneously transmitted between linked preamplifier

channels.

When a system with linked preamplifier channels is powered on, left/right ori-

entation is established immediately, with no user intervention. For more infor-

mation on linked preamplifiers, see Appendix: CAN Link and Multiple

Evolution Two Preamplifiers, on page 51.

3. Neatly arrange and organize wiring to and from the Evolution Two preamplifier

and all components. Separate AC wires from audio cables to prevent hum or

other unwanted noise from being introduced into the system.

4. Connect the outputs of your source equipment to the appropriate CAST (34),

balanced (30), single-ended (31), or tape inputs (32, 33) on the Evolution Two.

5. Connect the appropriate main outputs (35-41) on the Evolution Two to your

amplifier.

continued

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(SECTION THREE: Quick Start)

(Connecting the Evolution Two To Your System continued)

6. On each preamplifier channel, connect the supplied AC power cord to the IEC

power cord receptacle (48).

7. On each preamplifier channel, plug the AC power cord into AC power. The

front panel display (15) scrolls through EVOLUTION 2 SOFTWARE VERSION, and the

red stand-by LEDs illuminate (4), indicating that the Evolution Two preamplifier

is in stand-by mode. The scrolling stops when the Evolution Two is ready to be

powered on.

Note

Use only the power cord provided with the preamplifier channel to make the connec-

tion to AC power. Operation with a power cord other than the one supplied by Krell

could induce noise, limit current, or otherwise impair the ability of the preamplifier chan-

nel to perform optimally.

Operating the Evolution Two (Linked Mode)

After the Evolution Two is connected to your system and to AC power, and the

front panel display (15) has stopped scrolling, begin operation:

1. Press the power button on either preamplifier chassis front panel or the pwr

key (3) on the remote control. The blue backlights illuminate, the red stand-by

LEDs (4) turn off, and the front panel displays read INITIALIZING. The front panel

displays show the factory default input: S-1, and level: -INF. The Evolution Two

is now in the operational mode.

2. With the Evolution Two preamplifier output muted or the volume fully attenuat-

ed, select a source manually using the front panel input select buttons or the

input select keys on the remote control (8, 9, 10, 11). Start playing the source.

Use the level control knob or level keys (16) to set the volume to a comfortable

listening level.

3. To return the Evolution Two preamplifier to the stand-by mode, press the

power button or pwr key.

Krell recommends leaving the Evolution Two in the stand-by mode when it is

not playing music.

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SECTION

FOUR

Anatomy of an Evolution Two

This section describes Evolution Two Monaural Preamplifier functions.

Figure 1 Evolution Two Preamplifier Chassis and Power Supply Chassis Front Panels

TAPE

PHASE

RECORD

POWER

ENTER

MUTE

3 4

10 11 12 13 14 16

17 18

1 Preamplifier Chassis

2 Power Supply Chassis

3 Power Button

Chassis

Power

4 Stand-by LED

5 Power Backlight

Remote

6 IR Sensor

Functions

Preamplifier

Functions

7 Infrared Transmitter LED

8 Single-ended Input

Selection Buttons

9 Balanced Input

Selection Buttons

10 CAST Input Selection Buttons

11 Tape Button and LED

12 Mute Button and LED

13 Record Button and LED

14 Phase Button and LED

15 Front Panel Display

16 Level Control Knob

17 Menu Button

Inset Evolution Two Preamplifier

Channel: Front Panel View

Display

Level

Navigate/

Customize

18 Enter Button

19 Preamplifier Chassis Feet

20 Power Supply Chassis Feet

continued

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(SECTION FOUR: Anatomy of an Evolution Two continued)

Figure 2 Evolution Two Remote Control

3 Power Key

8 Single-ended Input

Selection Keys

Power

Preamplifier

Functions

9 Balanced Input

Selection Keys

10 CAST Input

Selection Keys

11 Tape Key

12 Mute Key

13 Record Key

14 Phase Key

21 Main Bus Key

22 Balance Key

16 Level Keys

17 Menu Key

18 Enter Key

23 Pause Key

24 Play Key

Level

Navigate/

Customize

Functions

25 Stop Key

26 Track Forward

and Back Key

27 Search Forward

and Back Key

Amplifier

Functions

28 Amplifier Power Key

29 Meter Select Key

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Front Panel Description

See Figure 1 on page 15

Each Evolution Two Monaural Preamplifier channel is comprised of two chas-

sis, the preamplifier chassis and the power supply chassis. Front panel func-

tions and their descriptions follow.

Chassis

1 Preamplifier Chassis

The preamplifier chassis front panel provides power on, input and zone selec-

tion, level control, menu functions, and status display.

2 Power Supply Chassis

Powerful transformers, high quality regulators, and extensive electrical and

magnetic shielding are housed in a separate power supply for each preampli-

fier channel.

Power

3 Power Button or Key

Use this button or key to switch the Evolution Two between the stand-by and

operational modes.

4 Stand-by LED

The red stand-by LEDs on the preamplifier and the power supply illuminate

when the Evolution Two is plugged into a standard AC wall receptacle, indicat-

ing that the Evolution Two is ready to be switched to the operational mode.

The stand-by LEDs flash when remote control signals are received.

5 Power Backlight

The blue power backlight illuminates when the Evolution Two is in the opera-

tional mode.

Remote Functions on the Front Panel

6 Infrared Sensor

The infrared sensor receives commands from the Evolution Two remote con-

trol. For proper remote control operation, make sure the infrared sensor is not

covered or obstructed.

7 Infrared Transmitter LED

The stand-by LED (4) on the preamplifier chassis (1) flashes when the Evolution

Two sends signals via the infrared transmitter LED to a programmable remote

control, such as the Universal Krell Touch Screen Remote. See IR Out

Control, on page 40.

continued

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(SECTION FOUR: Anatomy of an Evolution Two continued)

Preamplifier Functions

8, 9, 10 Input Select Buttons or Keys

Use these buttons to select the corresponding rear panel input that is connect-

ed to a CAST (C-1, C-2, C-3), balanced (B-1, B-2, B-3), or single-ended (S-1,

S-2, S-3, S-4) analog source. The front panel display shows the selected input

and volume level.

There is no dedicated tape input connector on the Evolution Two. B-3 and S-4

may be selected for tape input.

11 Tape Button and LED, or Key

Use this button or key to select the corresponding rear panel input that is con-

nected to an analog tape source. Either B-3 or S-4 (32, 33) may be configured

as a tape input. When you configure either input, the other input is available as

a normal input. The red tape LED illuminates when the tape input is selected.

The front panel display (15) shows: TAPE and the main volume level. To cus-

tomize tape operation see Tape Input, on page 46.

12 Mute Button and LED, or Key

Use this button or key to mute the preamplifier channel output. To unmute,

press the mute button again. The red mute LED illuminates when mute is

selected. To customize mute operation see Mute, on page 42.

13 Record Button and LED, or Key

Use this button or key to select the desired input for the record bus. The red

record LED illuminates, when record is selected. The front panel display (15)

shows the selected record input and the main volume level. To return to the

main input display, press the record button again. See Play and Record, on

page 30.

14 Phase Button and LED, or Key

Use this button or key to invert the absolute polarity of the main output 180

degrees. The red phase LED illuminates, when phase is selected.

Display

15 Front Panel Display

The front panel display provides preamplifier channel status messages, includ-

ing input and record bus status, tape output status, volume level, balance off-

set, and menu selections.

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Level Control

16 Level Control Knob or Level Keys

Use this knob or keys to increase or decrease system volume level or, with the

balance key (22), to adjust balance. The level control knob or keys also select

menu options that customize the Evolution Two. See Customizing the

Evolution Two, on page 32.

Navigate/Customize

17 Menu Button or Key

Use this button or key to access the menu functions of the Evolution Two. For

more information, see Customizing the Evolution Two, on page 32.

18 Enter Button or Key

Use this button or key to configure the menu functions of the Evolution Two.

For more information, see Customizing the Evolution Two, on page 32.

continued

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(SECTION FOUR: Anatomy of an Evolution Two continued)

Remote Control Description

See Figure 2 on page 16

The Evolution Two Monaural Preamplifier remote provides all of the power, pream-

plifier, level control, and navigate/customize functions outlined under Front Panel

Description, pages 17-19. The remote control provides additional functions,

including CD functions and menu configuration, accessed using only the remote

control keys.

Battery Installation and Removal

The Evolution Two preamplifier remote control uses 2 AAA-size 1.5 Volt batteries.

Batteries are included with the shipment. To install the batteries:

1. Remove the remote control backplate, using the supplied T-10 Torx wrench.

2. Install the batteries, following the battery position diagram on the plastic bat-

tery receptacle.

3. Replace and secure the backplate.

Notes

Replace batteries when remote control function becomes intermittent.

Remove batteries if the remote control is not used for a long period of time. Battery leakage

can damage the remote control.

Preamplifier Functions

21 Main Bus Key

Use this key to select the input for the main bus output. The red main LED illu-

minates, when this function is selected. For more information, see Play and

Record, on page 30.

Level Control

22 Bal(ance Key)

Use this key, along with level keys or the level control knob (16) on the pream-

plifier chassis to balance left and right output levels. The front panel display

(15) shows the left and right balance offset.

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Compact Disc Functions

The compact disc keys of the Evolution Two remote control are functional with all

Krell compact disc players.

23 Pause Key

Use this key to temporarily suspend playing the current compact disc track.

Press pause again or press the play key (24), to resume playing the track at the

point pause was engaged.

24 Play Key

Use this key to begin compact disc playback.

25 Stop Key

Use this key to end compact disc playback.

26 Track Forward and Back Keys

Use these keys to select and begin playing the track that follows or precedes

the current track.

27 Search Forward and Back Keys

Press and hold these keys to scroll forward or backward through the current

track.

Note

For information on track programming functions, refer to the owner's reference of your

Krell compact disc player.

Amplifier Functions

28 Amp Pwr Key

Use this key to activate Krell amplifiers connected to your system.

29 Sel (Meter Select) Key

Use this key to select the meter range of the power meter scale on the front of

a Krell Evolution One power amplifier. Please refer to the Evolution One

Owner’s Reference, for more information.

continued

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(SECTION FOUR: Anatomy of an Evolution Two continued)

Figure 3 Evolution Two Preamplifier Chassis and Power Supply Chassis Back Panels

LINK

EVOLUUTION TWO

MAIN BUS

RECORD BUS

OUT OUT

INPUTS

TAPE OUTPUTS

MAIN OUTPUTS

POWER

39 40

37 38

35 36

EVOLUTION TWO

50/60 Hz

KRELL INDUSTRIES, INC.

45 CONNAIR ROAD

ORANGE, CT 06477-3650

USA

POWER

ANALOG

SUPPLY

FUSE

DIGITAL

SUPPLY

FUSE

PHONO POWER

MADE IN USA

NO USER SERVICEABLE PARTS INSIDE

46 47

Inputs

30 Balanced Inputs: B-1, B-2, B-3

31 Single-ended Inputs: S-1, S-2, S-3, S-4

32 Balanced Tape Input: B-3

33 Single-ended Tape Input: S-4

34 CAST Inputs: C-1, C-2, C-3

35 Main Bus Balanced Tape Output

Outputs

36 Main Bus Single-ended

Tape Output

37 Record Bus Balanced

Tape Output

38 Record Bus Single-ended

Tape Output

39 Balanced Main Output

40 Single-ended Main Output

41 CAST Outputs

42 RC-5 Input

Remote

43 RC-232 Input

44 12 VDC In/Out

Link Control

Phono

Power

45 CAN Link In/Out

46 Phono Power Port

47 DC Power Connector

48 IEC Power Cord Receptacle

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Back Panel Description

See Figure 3 on page 22

The Evolution Two Monaural Preamplifier back panel provides all input and output

connections, remote control inputs and outputs, and the power connection. Back

panel features and their descriptions follow.

Left/Right Channel Orientation

Evolution Two preamplifiers are assembled as left or right preamplifier channels.

Preamplifier RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier

channels are assembled with white RCA connectors, and right preamplifier chan-

nels are assembled with red RCA connectors.

Inputs

30 Balanced Inputs: B-1, B-2, B-3

The Evolution Two is equipped with 3 balanced analog source inputs with XLR

connectors.

31 Single-ended Inputs: S-1, S-2, S-3. S-4

The Evolution Two is equipped with 4 single-ended analog source inputs with

RCA connectors.

32, 33 Tape Inputs: B-3 and S-4

The Evolution Two is equipped with one balanced and one single-ended input,

for use with a tape source. Either input may be configured as the tape input,

from the menu (17). When you select the tape input (11), the other input

becomes a normal input, selectable using the front panel button or the remote

control key (8, 9).

34 C-1, C-2, and C-3 CAST Inputs

The Evolution Two is equipped with 3 CAST inputs with 4-pin bayonet connec-

tors, for use with Krell CAST-equipped input devices.

Outputs

35, 36 Main Bus Outputs

The Evolution Two is equipped with one balanced main bus output with XLR

connectors and one single-ended main bus output with RCA connectors. Use

the main bus outputs to record the input signal playing on the main outputs.

For more information, see Play and Record, on page 30.

continued

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(SECTION FOUR: Anatomy of an Evolution Two continued)

(Outputs continued)

37, 38 Record Bus Outputs

The Evolution Two is equipped with one balanced record bus output with XLR

connectors and one single-ended record bus output with RCA connectors. Use

the record bus outputs to record a input signal other than the signal playing on

the main outputs. For more information, see Play and Record, on page 30.

39, 40 Main Outputs

The Evolution Two is equipped with one balanced output with XLR connectors

and one single-ended output with RCA connectors.

41 CAST Outputs

The Evolution Two is equipped with two CAST preamplifier outputs with 4-pin

bayonet connectors, for use with Krell CAST-equipped amplifiers.

Remote Connections on the Back Panel

42 RC-5 In

Each Evolution Two preamplifier chassis (1) has an RC-5 remote input. The

RC-5 remote connector is used with a third party remote control system that

provides RC-5 (IR) data with the carrier intact, via a wired connection. A stereo

tip, ring, sleeve 1/8” mini connector is used in the following configuration: Tip =

RC-5 data, Ring = +5 V, Sleeve = GND.

43 RS-232

Each Evolution Two preamplifier chassis (1) has an RS-232 port that receives

messages from a computer-based control system, providing integrated control

of all preamplifier functions. The RS-232 input uses a 9-pin D-subminiature

connector. See the Evolution Two developer's reference, entitled RS-232 Port:

Sending Commands and Interpreting Data, for more information.

44 12 VDC In/Out (12 V Trigger)

Each Evolution Two preamplifier chassis (1) has 2 outputs that send and one

input that receives 12 VDC power on/off (12 V trigger) signals to and from

other Krell components and other devices that incorporate a 12 V trigger. This

allows you to turn other components on or off, or to and from stand-by,

through the remote control. When the Evolution Two is switched to operational

mode and is connected to other components through the 12 V trigger, it sends

a signal that will switch other components, allowing whole systems or parts of

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systems to be easily coordinated. For more information on customizing the 12 V

trigger, see Input Trigger, on page 39. Mono 1/8” mini connectors are used in

the following configuration: Tip = +12 V, Sleeve = GND.

Notes

When the Evolution Two is in the operational mode, the 12 V trigger provides 12 Volts

of DC output. When the component is in the stand-by mode or off, the DC output is

0 Volts.

A minimum of 30 mA is required to operate the 12 V trigger.

Consult the owner's reference of the components used in a custom installation to take

full advantage of the remote capabilities of the Evolution Two.

Link Control

45 CAN Link

Each Evolution Two preamplifier chassis (1) has 2 RJ-45 link connectors, con-

nected in parallel. These are used to operate preamplifier channels in linked

mode. For more information, see Connections Using CAN Link, on page 28,

Operation Using CAN Link, on page 31, and Link Control, on page 41.

Phono Stage Connector

46 Phono Power Port

Each power supply chassis (2) has a phono power port, for connecting the

preamplifier to a Krell KPE phono stage. Only one phono power port needs to

be connected to the KPE.

Power

47 DC Power Connector

Each preamplifier channel is equipped with two DC power connectors that

connect the preamplifier chassis and the power supply chassis, using the pro-

vided 12-pin DC power cable.

48 IEC Power Cord Receptacle

The IEC power connector, located on the power supply chassis (2), is for use

with the provided IEC standard 15 amp AC power cord.

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SECTION

FIVE

Connecting the Evolution Two

to Your System

This section describes Evolution Two Monaural Preamplifier connections and intro-

duces the CAN Link remote control option.

Input and Output Connections

Krell recommends using its proprietary Krell CAST system for unparalleled sonic

performance for connections between the Evolution Two preamplifier and other

CAST-equipped components. Krell CAST uses flexible interconnecting cables that

can be drawn through tight spaces and concealed.

The Evolution Two also offers balanced operation. The circuitry and connections

associated with balanced operation not only can minimize sonic loss but also are

immune to induced noise, especially for installations using long cables.

XLR Pin Configuration

Pin 1

Pin 2

Pin 3

Ground

Non-inverting (0 )

Inverting (180 )

Inputs and outputs are located on the Evolution Two back panels. Maintain the

correct left/right orientation, when hooking up your system.

Left/Right Channel Orientation

Evolution Two preamplifiers are assembled as left or right channels. Preamplifier

RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier channels are

assembled with white RCA connectors, and right preamplifier channels are

assembled with red RCA connectors.

Connection Steps

Position each power supply and preamplifier chassis where you intend to use the

connected channels. Do do not move the connected chassis after they are

assembled.

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The following steps describe how to connect an Evolution Two preamplifier to

your system:

1. Connect each power supply chassis and preamplifier chassis with the 12-pin

DC cable provided, using the DC power connectors (47) on the back panels

(1-2).

IMPORTANT

Never connect two power supplies together.

2. In order to operate the Evolution Two preamplifier in linked mode, connect the

preamplifier channels together with the supplied RJ-45 control cable. In linked

mode, functions including power, volume, balance, phase, record, mute, and

input selections are instantaneously transmitted between linked preamplifier

channels.

When a system with linked Evolution Two preamplifiers is powered on, left/right

orientation is established immediately, with no user intervention. For more

information on linked preamplifiers, see Appendix: CAN Link and Multiple

Evolution Two Preamplifiers, on page 51.

3. Neatly arrange and organize wiring to and from the Evolution Two preamplifier

and all components. Separate AC wires from audio cables to prevent hum or

other unwanted noise from being introduced into the system.

4. Connect the outputs of your source equipment to the appropriate CAST (34),

balanced (30), single-ended (31), or tape inputs (32, 33) on the Evolution Two.

5. Connect the appropriate main outputs (35-41) on the Evolution Two to your

amplifier.

6. On each preamplifier channel, connect the supplied AC power cord to the IEC

power cord receptacle (48).

7. On each preamplifier channel, plug the AC power cord into AC power. The

front panel display (15) scrolls through EVOLUTION 2 SOFTWARE VERSION, and the

red stand-by LEDs illuminate (4), indicating that the Evolution Two preamplifier

is in stand-by mode. The scrolling stops when the Evolution Two is ready to be

powered on.

Note

Use only the power cord provided with the preamplifier channel to make the connec-

tion to AC power. Operation with a power cord other than the one supplied by Krell

could induce noise, limit current, or otherwise impair the ability of the preamplifier chan-

nel to perform optimally.

continued

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(SECTION FIVE: Connecting the Evolution Two to Your System continued)

Connections Using CAN Link

The Evolution Two brings a new convenience to the operation of monaural pream-

plifiers, using a sophisticated, reliable control system called a controller area net-

work (CAN). Using CAN Link, any number of preamplifier channels may be linked

for multichannel playback. CAN Link enables all linked preamplifier channels to be

controlled from any single linked preamplifier channel in the system.

To Connect Multiple Evolution Two

Preamplifiers via CAN Link:

After the power supply chassis is connected to the preamplifier chassis with the

12-pin DC cable:

1. Connect one RJ-45 connector from either CAN Link connector (45) on the

back panel of any preamplifier chassis (1) to either CAN Link connector on any

other preamplifier chassis. The two preamplifier channels that are connected

are now linked.

2. Repeat Step 1 for each additional preamplifier channel you want to link. For

more information on linked preamplifier channels, see Appendix: CAN Link

and Multiple Evolution Two Preamplifiers, on page 51.

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SECTION

SIX

Evolution Two Operation

The Evolution Two Monaural Preamplifer is easy to operate. Instructions follow for

on/off and stand-by operation.

IMPORTANT

Always mute or fully attenuate the preamplifier level when switching sources.

Do not change input connections to the amplifier when the amplifier is on.

Use care when setting high playback levels. Always lower the volume level at the first

sign of loudspeaker distress.

On/Off and Stand-by Operation (Linked Mode)

When powering on any system, turn on amplifiers last. When powering down, turn

off amplifiers first.

After the Evolution Two is connected to your system and to AC power, and the

front panel display (15) has stopped scrolling, begin operation:

1. Press the power button on either preamplifier chassis front panel or the pwr

key (3) on the remote control. The blue backlights illuminates, the red stand-by

LEDs (4) turn off, and the front panel displays read INITIALIZING. The front panel

displays shows the factory default input: S-1, and level: -INF. The Evolution Two

is now in the operational mode.

2. With the Evolution Two preamplifier output muted or the volume fully attenuat-

ed, select a source manually using the front panel input select buttons or the

input select keys on the remote control (8, 9, 10, 11). Start playing the source.

Use the level control knob or level keys (16) to set the volume to a comfortable

listening level.

3. To return the Evolution Two to the stand-by mode, press the power button or

pwr key.

Krell recommends leaving the Evolution Two in the stand-by mode when it is not

playing music. Turn the Evolution Two off when the system is not being used for

an extended period of time.

continued

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(SECTION SIX: Evolution Two Operation continued)

To Turn Off Your System

1. Place the amplifiers in the stand-by mode.

2. Press the power button on the preamplifier chassis front panel or the pwr key

(3) on the remote control to switch the Evolution Two to the stand-by mode.

3. Turn off the amplifiers using the back panel power switch or by disconnecting

them from AC power.

4. Turn off the Evolution Two by unplugging the AC power cord from AC power.

Play and Record

The Evolution Two allows you to listen to one source through the main output (39

or 44), while recording a different source through the record bus output (37 or 38).

A main bus tape output (35, 36) is also available and allows for the connection of a

second recording device.

1. Press the power button (3) on the preamplifier chassis front panel (1) to switch

the Evolution Two from stand-by to the operational mode.

2. Press the input selection button on the preamplifier chassis front panel or the

input selection keys (8, 9, 10, or 11) on the remote control to select the source

that you want to listen to through the main outputs.

3. Begin playing the source. Use the level control knob on preamplifier chassis

front panel or the level keys (16) on the remote control to adjust the volume to

the desired listening level.

4. Press the record button on the preamplifier chassis front panel or the record

key (13) on the remote control. The red record LED illuminates on the preampli-

fier chassis front panel.

5. Press the input selection button or keys to select the source that you want to

record through the record bus output. This source can be different than the

source selected for the main bus outputs, in Step 2.

6. Press the record button or the main key (21) on the remote control, to return to

the main bus output.

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Operation Using CAN Link

When a system with linked Evolution Two preamplifier channels is powered on,

left/right orientation is established immediately, with no user intervention.

1. The input selections and the power, volume, balance, phase, record, and mute

adjustments you make on any preamplifier channel are instantly transmitted

between all linked preamplifier channels.

2. All configuration settings may be copied from any linked preamplifier channel

to all other linked preamplifier channels using the clone feature. See Clone, on

page 35.

For more information on linked preamplifiers, see Appendix: CAN Link and

Multiple Evolution Two Preamplifiers, on page 51.

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SECTION

SEVEN

Customizing the Evolution Two

The Evolution Two Monaural Preamplifier easy-to-use menu allows you to config-

ure the following functions. You can also use the menu to review version informa-

tion about the software, hardware, and firmware installed in the Evolution Two:

AC Mains, page 33

Backlight, page 33

Balance, page 34

Input Name, page 38

Input Phase, page 39

Input Trigger, page 39-40

Recall, page 44

RS-232 Control, page 44-5

Save, page 45

Channel Assign, pages 34-5 IR Out Control, page 40

Software Clone, page 45-6

Tape Input, page 46

Theater Mode, page 47

Volume Display, page 48

Clone, page 35-6

Link Control, page 41

Mute, page 42

Display, page 36-7

Info, page 37

Output Trigger, page 42-43

RC-5 Control, page 43

Input Level Trim, page 38

Navigation Conventions

Navigating the Evolution Two menu is straightforward and consistent throughout,

using four functions and the menu option BACK.

17 Menu Button or Key

To enter the menu, press the menu button on the preamplifier chassis front panel

or the menu key on the remote control. Once you are in the menu, you can press

the menu button or key to exit the menu.

16 Volume Knob or Level Keys

Use the volume knob on the preamplifier chassis front panel or the up and down

keys on the remote control to scroll forward and backward through the menu hier-

archy. Each menu list is a continuous loop.

18 Enter Button or Key

Press the enter button on the preamplifier chassis front panel or the enter key on

the remote control to select a function or a configuration option, and to confirm a

selection. Only the enter button on the preamplifier chassis front panel may be

used to initiate a clone.

15 Front Panel Display

The display shows the active function and configurable options.

BACK

Select back to scroll backwards up the menu hierarchy, or to exit a menu option

without confirming it.

The first list you see in the menu is the list of configurable functions. Select a con-

figurable function to view a submenu: the list of options that configure the func-

tion. You can configure some options as well, using a second submenu.

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Menu Functions

AC Mains

This function enables you to operate the Evolution Two from a switched AC outlet.

If AC Mains is set to ON, the preamplifier turns on immediately, by-passing stand-

by. Thereafter, you may switch the preamplifier to and from stand-by, using the

power button or pwr key (3). The options are: OFF, ON.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: AC MAINS.

2. Press the enter button on the preamplifier chassis front panel or the enter key (18)

on the remote control. The front panel display (15) shows the default mode: OFF.

3. Use the level control knob or the up and down keys to select the desired

option: OFF or ON.

4. Press the enter button or key to confirm the selection. The front panel display

reads: AC MAINS.

OFF

The Evolution Two switches to stand-by mode, when it detects AC power.

The Evolution Two turns on immediately, bypassing the stand-by mode, when it

detects AC power.

Backlight

This function enables you to control the blue power indicator brightness. The

options are: OFF, LOW (25%), MED (50%), HIGH (100%).

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: BACKLIGHT.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) reads: BRIGHTNESS.

3. Press the enter button or the enter key again. The front panel display shows

the default mode: HIGH.

4. Use the level control knob or the up and down keys to select the desired

brightness: OFF, LOW, MED, HIGH.

5. Press the enter button or key to confirm the selection. The front panel display

reads: BRIGHTNESS.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

Balance

This function enables you to select the balance between the left and right chan-

nels. The options are: CENTER, L .5-5 dB <, R .5-5 dB >.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: BALANCE.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: CENTER.

3. Use the level control knob or the up and down keys to select the desired bal-

ance option from 0 to +5 dB, in .5 dB increments, left or right.

4. Press the enter button or key to confirm the selection. The front panel display

reads: BALANCE.

Balance is not active if a preamplifier channel is not linked. At least two linked pre-

amplifier channels s are required for balance to activate. For more information on

linked preamplifiers channels, see Appendix: CAN Link and Multiple Evolution

Two Preamplifiers, on page 51.

Channel Assign

This function enables you to override the factory set channel assignments. The

options are: FORCE LEFT, FORCE RIGHT, FORCE NONE, NO OVERRIDE.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: CHANNEL ASSIGN.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: NO OVERRIDE.

17 Menu Button or Key

Enter or exit the menu.

16 Volume Knob

or Level Keys

3. Use the level control knob or the up and down keys to select the desired

Navigate the menu hierarchy;

review functions and configu-

ration options.

option: NO OVERRIDE, FORCE LEFT, FORCE RIGHT, or FORCE NONE.

4. Press the enter button or key to confirm the selection. The front panel display

18 Enter Button or Key

Select a configuration option;

confirm a selection.

reads: CHANNEL ASSIGN.

FORCE LEFT

BACK

Use to make a left channel respond as a right channel.

Scroll backwards through the

menu hierarchy; exit a menu

option without confirming it.

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FORCE RIGHT

Use to make a right channel respond as a left channel.

FORCE NONE

The preamplifier channel ignores balance selections. Use this option to set up

more than 2 preamplifier channels.

NO OVERRIDE

Return to CHANNEL ASSIGN. Serves the same function as BACK in all other menu

items.

For more information on linked preamplifiers, see Appendix: CAN Link and

Multiple Evolution Two Preamplifiers, on page 51.

Clone

This function enables you to transfer configured functions between linked pream-

plifier channels. There is no need to configure multiple menu choices for each pre-

amplifier channel. Clone insures that, where desired, the configuration of functions

for multiple preamplifier channels is identical. The option is: CLONE BEGIN.

Enter the menu, then:

1. Identify the clone transmitter and clone receiver. The clone transmitter is the

preamplifier channel that transmits the clone and the clone receiver(s) is/are

the preamplifier channel(s) that receive(s) the clone.

2. Use the level control knob on the preamplifier chassis front panel (1) of the

clone transmitter, or the up and down keys (16) on the remote control to select:

CLONE.

3. Press the enter button on the preamplifier chassis front panel (1) of the clone

transmitter or the enter key (18) on the remote control. The front panel display

(15) reads: CLONE BEGIN.

4. Press the enter button or the enter key again. The clone transmitter display

reads: CLONE TRANSMIT and the clone receiver display(s) read(s): CLONE RECEIVE.

5. Press the enter button on the front panel of the clone transmitter. All clone

receivers go into stand-by mode, indicating that the clone is accomplished.

Note

The enter button on the remote control cannot be used to activate the clone function.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

CLONE BEGIN

Sends the message that a clone is about to begin, from the clone transmitter to

the clone receiver(s).

CLONE TRANSMIT

Once the clone begin message is sent, the clone transmitter display reads: CLONE

TRANSMIT, indicating that the preamplifier is ready to transmit the clone data.

CLONE RECEIVE

Once the clone begin message is sent, the clone receiver(s) display reads: CLONE

RECEIVE, indicating that the preamplifier(s) is(are) ready to receive the clone data.

Note

In order to set a clone receiver to ignore the clone, use the level control knob on the clone

receiver front panel to scroll to CLONE IGNORE.

Display

This function enables you to turn on the front panel display (15) all the time, or

turn it off after a time out. The options are: ON, TIMED.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or the up and

down keys on the remote control (16) to select: DISPLAY.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) reads: MODE.

3. Press the enter button or key (18) again. The front panel display shows the

default mode: ON.

4. Use the level control knob or the up and down keys to select the desired

option: ON or TIMED.

5. Press the enter button or key to confirm the selection. The front panel display

17 Menu Button or Key

reads: MODE.

Enter or exit the menu.

16 Volume Knob

or Level Keys

6. Use the level control knob or the up and down keys to select: BRIGHTNESS.

7. Press the enter button or key. The front panel display shows the default mode:

Navigate the menu hierarchy,

review functions and configu-

ration options.

HIGH.

8. Use the level control knob or the up and down keys to select the desired

18 Enter Button or Key

Select a configuration option

or confirm a selection.

brightness: OFF, LOW (25%), MED (50%), or HIGH (100%).

9. Press the enter button or key to confirm the selection. The front panel display

BACK

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

reads: BRIGHTNESS.

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The front panel display is always on.

TIMED

The front panel display times out after 5 seconds.

BRIGHTNESS

Controls the brightness of the display. When the brightness setting is OFF, the

display is at 50% of brightness when in menu mode, and turns completely off

when you leave the menu mode.

Info

This function enables you to access information about the preamplifier software,

EEPROM, and PC Boards. The PC Boards are listed in the left margin, on this

page.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

PC Boards

CAST IN 1

CAST IN 2

CAST IN 3

CONNECT

CONTROL

DISPLAY

down keys (16) on the remote control to select: INFO.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) show the software ver-

sion number.

DISPLAY VERSION

ENCODER

FACEPLATE

MAIN

3. Rotate the level control knob clockwise or press the up key. The front panel

display shows the EEPROM version number.

4. Rotate the level control knob clockwise or press the up key again. The front

OUT 1

OUT 2

panel display shows the PC board version number.

REGULATOR

TAPE OUT 1

TAPE OUT 2

VOLT IN

5. Press the enter button or key. Use the level control knob or the up and down

keys to scroll through the version numbers of PC boards, from the PC Boards

listed at left.

VOLUME

EEPROM

Electrically erasable programmable read-only memory. An erasable memory chip

used in the Evolution Two to store menu selection information.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

Input Level Trim

This function enables you to select an input offset for a particular input. The

options are: +/-6 dB, in 1 dB increments.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or the up and

down keys (16) on the remote control to select: INPUT LEVEL TRIM.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: B-1.

3. Use the level control knob or the up and down keys to select the desired input:

B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.

4. Press the enter button or key. The front panel display shows the default mode:

0 dB.

5. Use the level control knob or the up and down keys to select the desired trim

option: +/-6 dB, in 1 dB increments.

6. Press the enter button or key to confirm the selection. The front panel display

shows the selected input.

Input Name

Input Name Options

AUX, AUX1, AUX2, AUX3

B-1, B-2, B-3, BYPC-1

C-2, C-3, CABLE, CD, CD1,

CD2, CD-R, COMP

This function enables you to select an input name for each input. The input name

options are listed in the left margin, on this page.

Enter the menu, then:

DAC, DAT, DCC, DISC, DISC 1,

DISC 2, DISC 3, DSS, DVD,

DVD1, DVD2, DVD3, DVD-A

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: INPUT NAME.

EQ, GAME, HI-8

LD, LD1, LD2, LINE 1, LINE 2,

LINE 3, LINE

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: B-1.

MDISC, MIXER, MON

PHONO, PHON1, PHON2,

PROC

3. Use the level control knob or the up and down keys to select the desired input:

S-1, S-2, S-3, S-4, SACD, SAT,

SRC1, SRC2, SRC3, SURR,

S-VID

B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.

TAPE1, TAPE2, TAPE3, TAPE,

TEST, THR, TUNER, TUNR1,

TUNR2, TV,

4. Press the enter button or key. The front panel display shows no characters.

5. Use the level control knob or the up and down keys to select the desired input

VCR, VCR1, VCR2, VCR3,

VDISC, VIDEO, VID1, VID2,

VID3

name, from the input name options listed at left.

6. Press the enter button or key to confirm the selection and return to the input

8MM, 8TRK

list, in Step 3. The front panel display shows the input name.

To select input names for other inputs, repeat Steps 3 and 4.

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Input Phase

This function enables you to invert the absolute polarity of the selected input 180

degrees. The selections are: NORMAL, INVERT.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or the up and

down keys (16) on the remote control to select: INPUT PHASE.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: B-1.

3. Use the level control knob or the up and down keys to select the desired input

from the list: B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.

4. Press the enter button or key. The front panel display shows the default mode:

NORMAL.

5. Use the level control knob or the up and down keys to select: NORMAL or INVERT.

6. Press the enter button or key to confirm the selection. The front panel display

shows the selected input.

NORMAL

The phase of the selected input is unaffected.

INVERT

The phase of the selected input is inverted 180 degrees.

Input Trigger

This function enables you to configure the input trigger. The options are: OFF,

NORMAL, THEATER.

Enter the menu, then:

17 Menu Button or Key

1. Use the level control knob on the preamplifier chassis front panel or the up and

Enter or exit the menu.

down keys on the remote control to select: INPUT TRIGGER.

16 Volume Knob

or Level Keys

2. Press the enter button on the preamplifier chassis front panel or the or enter

key (18) on the remote control. The front panel display (15) shows the default

mode: NORMAL.

Navigate the menu hierarchy,

review functions and configu-

ration options.

18 Enter Button or Key

Select a configuration option

or confirm a selection.

3. Use the level control knob or the up and down keys to select the desired

option: OFF, NORMAL or THEATER.

BACK

4. Press the enter button or key to confirm the selection. The front panel display

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

reads: INPUT TRIGGER.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

(Input Trigger continued)

OFF

The Evolution Two does not respond to 12 V input trigger commands.

NORMAL

The Evolution Two responds to 12 V input trigger commands.

THEATER

The Evolution Two responds to 12 V input trigger commands, and the theater

mode enabled input is selected automatically. See Theater Mode, on page 47.

IR Out Control

This function enables you to access Evolution Two IR commands and program a

learning remote control.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: IR OUT.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: B-1 MAIN.

3. Use the level control knob or the up and down keys to select the desired IR

command from the list.

4. Press the enter button or key to send the command out via the preamplifier

front panel IR transmitter (7). The stand-by LED (4) on the preamplifier chassis

flashes, indicating that the command has been sent.

5. Repeat Steps 2-4 for each of the commands you wish to transmit.

6. Press the enter button or key to confirm the selection. The front panel display

reads: IR OUT.

17 Menu Button or Key

Enter or exit the menu.

For a listing of IR codes, see the Evolution Two developer’s reference entitled

RS-232 Port: Sending Commands and Interpreting Data. The right-terminated

preamplifier is the link transmitter of IR data. For more information on linked pre-

16 Volume Knob

or Level Keys

Navigate the menu hierarchy,

review functions and configu-

ration options.

amplifier channels, see Appendix: CAN Link and Multiple Evolution Two

Preamplifiers, on page 51.

18 Enter Button or Key

Select a configuration option

or confirm a selection.

BACK

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

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Link Control (CAN Link)

This function enables you to link and unlink preamplifiers. The options are: LINKED,

UNLINKED.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or the up and

down keys (16) on the remote control to select: LINK CONTROL.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: LINKED.

3. Use the level control knob or the up and down keys to select the desired

option: LINKED, or UNLINKED.

4. Press the enter button or key to confirm the selection. The front panel reads:

LINKED.

LINKED

When preamplifier channels are linked, power, volume, balance, phase, record,

mute, and input selections are automatically communicated between linked pre-

amplifier channels. All other settings remain local and may be cloned from one

preamplifier channel to another. See also Clone, on page 35, and Software

Clone, on page 45.

UNLINKED

When a preamplifier channel is unlinked, it does not respond to commands from

any other linked preamplifier channels. After the preamplifier channel is unlinked,

settings can be changed, independent of other preamplifier channels.

For more information on linked preamplifier channels, see Appendix: CAN Link

and Multiple Evolution Two Preamplifiers, on page 51.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

Mute

This function enables you to control the mute mode. The options are: FULL, -20 dB,

BACK.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: MUTE.

2. Press the enter button on the preamplifier chassis front panel or the or enter

key (18) on the remote control. The front panel display (15) shows the default

mode: FULL.

3. Use the level control knob or the up and down keys to select the desired

option: FULL or -20 dB.

4. Press the enter button or key to confirm the selection. The front panel display

reads: MUTE.

FULL

The output of the Evolution Two is completely silenced.

-20dB

The output of the Evolution Two is reduced by 20 dB and may still be audible.

Output Trigger

This function enables you to turn the two output triggers on or off, or configure

them with independent delays of up to 20 seconds. The options are: ON, OFF, DELAY.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: OUTPUT TRIGGER.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: TRIGGER 1.

17 Menu Button or Key

Enter or exit the menu.

16 Volume Knob

or Level Keys

3. Press the enter button or key again. The front panel display shows the default

Navigate the menu hierarchy,

review functions and configu-

ration options.

mode: OFF.

4. Use the level control knob or up and down keys to select: OFF, ON, or DELAY.

5. Select DELAY. You are prompted to enter a delay time of 0-20 seconds.

6. Enter the delay time.

18 Enter Button or Key

Select a configuration option

or confirm a selection.

BACK

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

7. Press enter to confirm the selection. The front panel display reads: DELAY.

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8. Use the level control knob or up and down keys to scroll to: BACK.

9. Press the enter button or key to return to: TRIGGER 1.

10. Use the level control knob or the up and down keys to scroll to: TRIGGER 2.

11. Repeat Steps 3-7 to set Trigger 2.

The 12 Volt trigger output is enabled at power on for the selected trigger (Trigger 1

or 2).

OFF

The 12 Volt trigger output is disabled at power on for the selected trigger (Trigger

1 or 2).

DELAY

The 12 volt trigger output is enabled at power on for the selected trigger (Trigger 1

or 2), and the delayed for a period of time (0-20 seconds).

RC-5 Control

This function enables you to change the link transmit status of the Evolution Two.

The options are: LINK TRANSMIT, LINK RECEIVE.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: RC-5 CONTROL.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: LINK TRANSMIT.

3. Use the level control knob or the up and down keys to select the desired

option: LINK TRANSMIT or LINK RECEIVE.

4. Press the enter button or key to confirm the selection. The front panel display

reads: RC-5 CONTROL.

The right-terminated preamplifier channel is the link transmitter of RC-5 data.

Connect the RC-5 cable to the RC-5 connector on the right-terminated preampli-

fier channel. For more information on linked preamplifier channels, see Appendix:

CAN Link and Multiple Evolution Two Preamplifiers, on page 51.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

Recall

This function enables you to access factory default settings or your own saved

settings, or to undo a clone. The options are: FACTORY, SAVED, CLONE UNDO.

Enter the menu, then:

1. Use the level control knob on the preamplifier channel front panel or up and

down keys (16) on the remote control to select: RECALL.

2. Press the enter button on the preamplifier channel front panel or the or enter

key (18) on the remote control. The front panel display (15) shows the default

mode: FACTORY.

3. Use the level control knob or the up and down keys to select the desired

option: FACTORY, SAVED, or CLONE UNDO.

4. Press the enter button or key to confirm the selection. The front panel display

reads: RECALL.

FACTORY

Recalls the factory settings.

SAVED

Recalls settings previously stored in memory using the SAVE function. See also

Save, on page 45.

CLONE UNDO

Cancels clone settings. All settings revert to the last settings in memory prior to

cloning. See also Clone, on page 35.

RS-232 Control

This function enables you to change the link transmit status of the Evolution Two.

The options are LINK TRANSMIT, LINK RECEIVE.

Enter the menu, then:

17 Menu Button or Key

Enter or exit the menu.

1. Use the level control knob on the preamplifier channel front panel or up and

16 Volume Knob

or Level Keys

down keys (16) on the remote control to select: RS-232 CONTROL.

Navigate the menu hierarchy,

review functions and configu-

ration options.

2. Press the enter button on the preamplifier channel front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: LINK TRANSMIT.

18 Enter Button or Key

Select a configuration option

or confirm a selection.

3. Use the level control knob or the up and down keys to select the desired

BACK

option: LINK TRANSMIT, or LINK RECEIVE.

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

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4. Press the enter button or key to confirm the selection. The front panel display

reads: RS-232 CONTROL.

The right-terminated preamplifier channel is the link transmitter of RS-232 data.

Connect the RS-232 cable to the RS-232 connector on the right-terminated pre-

amplifier channel. For more information on linked preamplifier channels, see

Appendix: CAN Link and Multiple Evolution Two Preamplifiers, on page 51.

Save

This function enables you to save a copy of the current settings. The options are:

GO, BACK.

Enter the menu, then:

1. Use the level control knob on the preamplifier channel front panel or up and

down keys (16) on the remote control to select: SAVE.

2. Press the enter button on the preamplifier channel front panel or the or enter

key (18) on the remote control. The front panel display (15) shows the default

mode: GO.

3. Press the enter button or key to save the settings The front panel display

reads: SAVE.

Saves a copy of current settings to memory, overwriting previously saved settings.

Software Clone

This function enables you to transfer operational software from one linked pream-

plifier channel to another. Software clone insures that, where desired, software for

multiple preamplifier channels is identical. The options are: NO, YES.

Enter the menu, then:

1. Identify the clone transmitter and clone receiver. The clone transmitter is the

preamplifier channel that transmits the clone and the clone receiver(s) is/are

the preamplifier channel(s) that receive(s) the clone.

2. Use the level control knob on the preamplifier chassis front panel of the clone

transmitter, or up and down keys (16) on the remote control to select: SOFTWARE

CLONE.

3. Press the enter button on the clone transmitter front panel or the enter key (18)

on the remote control. The front panel display (15) reads: SW BEGIN.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

(Software Clone continued)

4. Press the enter button or the enter key (18) again. The front panel display on

the clone transmitter shows the default: ARE YOU SURE NO.

5. Use the level control knob on the clone transmitter or the up and down keys to

select: ARE YOU SURE YES.

6. Press the enter button on the clone transmitter. The front panel display on the

clone transmitter reads: SENDING UPDATE. The front panel display on the clone

receiver(s) read(s): RECEIVING UPDATE. All linked preamplifier channels switch to

stand-by mode, indicating that the software clone is accomplished.

SW CLONE BEGIN

Begins the software clone process.

ARE YOU SURE

Confirms the software clone. The options are: NO, YES

Cancels the software clone. The front panel display returns to: SOFTWARE CLONE.

YES

Initiates the software clone.

Tape Input

This function enables you to select either S-4 or B-3 as the tape input. The input

that is not selected operates as a normal input. The options are: B-3, S-4, NONE.

Enter the menu, then:

1. Use the level control knob on the preamplifier channel front panel or up and

down keys (16) on the remote control to select: TAPE INPUT.

2. Press the enter button on the preamplifier channel front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: S-4.

17 Menu Button or Key

Enter or exit the menu.

16 Volume Knob

or Level Keys

3. Use the level control knob or the up and down keys to select the desired

option: S-4 , B-3, NONE, or BACK.

Navigate the menu hierarchy,

review functions and configu-

ration options.

4. Press the enter button or key to confirm the selection. The front panel display

reads: TAPE INPUT.

18 Enter Button or Key

Select a configuration option

or confirm a selection.

NONE

When the tape input is set to NONE, both S-4 and B-3 act as normal inputs, not as

tape inputs.

BACK

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

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Theater Mode

This function enables you to select theater mode volume for a particular input.

Use this function when connecting the output of a preamp/processor to the

Evolution Two for home theater applications. Configuring an input for theater

mode sets that input for unity gain and suspends the level control of the Evolution

Two. Volume adjustments are then made through the preamp/processor connect-

ed to the input configured for theater mode on the Evolution Two. The options are:

ON, OFF.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or the up and

down keys (16) on the remote control to select THEATER.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default input:

B-1.

3. Use the level control knob or the up and down keys to select the desired input:

B-1, B-2, B-3, S-1, S-2, S-3, S-4, C-1, C-2, C-3, or TAPE.

4. Press the enter button or key. The front panel display shows the default mode:

OFF.

5. Use the level control knob or the up or down keys to select ON or OFF.

6. Press ENTER to confirm the selection and return to the selected input.

The selected input is set to THEATER and the volume control for the theater input is

disengaged on the Evolution Two.

OFF

The selected input is configured normally and the volume control for the normal

input is engaged on the Evolution Two.

Note

Only one input on the Evolution Two can be in theater mode at a time. When theater mode

is set for an input, theater mode is cleared automatically from other inputs.

The Evolution Two selects the theater input automatically upon power on, if the input trig-

ger is configured for THEATER. See Input Trigger, on pages 39-40.

continued

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(SECTION SEVEN: Customizing the Evolution Two continued)

Volume Display

This function enables you to select the numeric mode for the volume display, dis-

playing values from softest to loudest: 0 to 151. Alternatively, you can select the

dB mode for the volume display, displaying values from softest to loudest: -inf to

+12 dB. The options are: NUMERIC, dB.

Enter the menu, then:

1. Use the level control knob on the preamplifier chassis front panel or up and

down keys (16) on the remote control to select: VOLUME DISPLAY.

2. Press the enter button on the preamplifier chassis front panel or the enter key

(18) on the remote control. The front panel display (15) shows the default

mode: dB.

3. Use the level control knob or the up and down keys to select the desired

option: NUMERIC or DB.

4. Press the enter button or key to confirm the selection. The front panel display

reads: VOLUME DISPLAY.

17 Menu Button or Key

Enter or exit the menu.

16 Volume Knob

or Level Keys

Navigate the menu hierarchy,

review functions and configu-

ration options.

18 Enter Button or Key

Select a configuration option

or confirm a selection.

BACK

Scroll up the menu hierarchy,

or exit a menu option without

confirming it.

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SECTION

EIGHT

Questions and Answers

Q. Why does the second preamplifier channel not respond when I select an input

or adjust the volume on the other preamplifier channel?

A. The two preamplifier channels must be linked together using the RJ-45 cable

in order for functions to be sent between preamplifier channels.

Q. I renamed the B-1 input on one of the preamplifier channels. Why does it still

read B-1 on the other preamplifier channel?

A. When two or more preamplifier channels are linked, basic functions such as

volume and input selection are simultaneously executed by all linked preampli-

fier channels. In order for linked preamplifier channels to recognize customized

menu functions such as renaming inputs, the clone procedure must be per-

formed. For more information, see Clone, on page 35, and Software Clone,

on page 45.

Q. When I adjust the balance, the sound moves to the side that is opposite my

adjustment. What is wrong?

A. The Evolution Two preamplifier is preset from the factory as either a left or a

right preamplifier. Make sure the preamplifier chassis with the white connectors

is used for the left channel and the preamplifier chassis with red connectors is

used for the right channel.

Q. What should I do if I see a DC ERROR message?

A. The Evolution Two preamplifier has a sophisticated DC protection system that

detects potentially harmful DC. Please contact Krell to determine what action

to take, if you see a DC error message.

Q. The Evolution Two preamplifiers are plugged into AC outlets and the link

cables are connected, but the preamplifier channels do not power on. What

should I do?

A. The link cables only pass data between preamplifier channels. The power sup-

ply chassis must be connected to the preamplifier chassis with the provided

12-pin DC cable.

continued

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(SECTION EIGHT: Questions and Answers continued)

Troubleshooting System Noise

When you mix and match high-performance audio components, each with its own

ground potential, a low frequency hum may occur in one or both loudspeakers.

If this happens when you place the Evolution Two preamplifier into your system,

follow these simple troubleshooting steps.

1. Check that all input and output connections are of sound construction.

2. With the preamplifier channel off, remove the interconnect cables, the turn the

preamplifier channel on. If the hum disappears, turn the preamplifier channel

off and reinsert one of the interconnect cables. Turn the preamplifier channel

back on. Repeat this process for each cable.

3. If the hum reappears with one or both interconnect cables reinserted, the cable

needs to be replaced.

4. If the interconnect cables are sound, you may be experiencing a ground loop.

Please contact your authorized Krell dealer, distributor, or Krell for suggestions

on how to eliminate the ground loop.

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Appendix: CAN Link and Multiple

Evolution Two Preamplifiers

The Evolution Two Monaural Preamplifier brings a new convenience to the opera-

tion of monaural preamplifiers, using a sophisticated, reliable control system called

a controller area network (CAN). The CAN Link communication system enables all

linked preamplifier channels to be controlled from any single linked preamplifier

channel in the system. CAN Link logic distinguishes between left and right chan-

nels. This distinction is of specific significance in the following situations:

1. The connection of multiple preamplifier channels.

2. The control of the Evolution Two using a third party remote control system via

the infrared (IR) transmitter (7) and the RC-5 (42) and RS-232 (43) connectors.

3. The use of the balance and channel assign functions, via the menu button or

key (17).

CAN Link logic is transparent during the normal operation of a stereo pair of linked

Evolution Two preamplifiers.

To Connect Multiple Evolution Two

Preamplifiers via CAN Link:

After the power supply chassis is connected to the preamplifier chassis with the

12-pin DC cable:

1. Connect one RJ-45 control cable from either CAN Link connector (45) on the

back panel of any preamplifier chassis (1) to either CAN Link connector on any

other preamplifier chassis. The two connected preamplifier channels are now

linked.

2. Repeat Step 1 for each additional preamplifiers you want to link.

continued

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(Appendix: CAN Link and Multiple Evolution Two Preamplifiers continued)

Left/Right Channel Orientation

Evolution Two preamplifiers are assembled as left or right channels. Preamplifier

RCA connectors (31, 36, 38, 40) are color coded. Left preamplifier channels are

assembled with white RCA connectors, and right preamplifier channels are

assembled with red RCA connectors.

Right-Terminated Preamplifier Channel

Right preamplifier channels have a unique electrical identity under CAN Link.

When a system with linked Evolution Two preamplifiers is powered on, the system

automatically identifies the right-terminated preamplifier channel, and left/right ori-

entation is established immediately, with no user intervention.

Any right preamplifier channel that is last in a chain of linked Evolution Two pream-

plifiers is referred to as right-terminated. There is only one RG-45 link cable con-

nected to a right-terminated preamplifier channel.

Example. The illustration below shows the preamplifier chassis back panels of

three linked preamplifier channels. There are two right (R) channels and one left (L)

channel. In this configuration, the top chassis belongs to a right-terminated pre-

amplifier channel:

right terminated

one RG-45 link cable connected

to the top chassis

IR, RC5, and RS-232 Data Transfer from a Third Party Controller

In a group of 2 or more preamplifier channels connected via CAN Link, the right-

terminated channel is the transmitter of IR, RC-5, and RS-232 data to the other

linked preamplifier(s), or receiver(s). Always make IR, RC-5, and RS-232 connec-

tions from the third party controller to the right-terminated preamplifier channel.

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Warranty

Each Evolution Series preamplifier has a limited warranty of five years for parts and

labor on circuitry. Should this product fail to perform at any time during the warran-

ty, Krell will repair it at no cost to the owner, except as set forth in this warranty.

This warranty does not apply to damage caused by acts of God or nature.

The warranty described on this page shall be in lieu of any other warranty,

expressed or implied, including, but not limited to, any implied warranty of mer-

chantability or fitness for a particular purpose. There are no warranties which

exceed beyond those described in this document. If this product does not perform

as warranted herein, the owner’s sole remedy shall be repair. In no event will Krell

be liable for incidental or consequential damages arising from purchase, use, or

inability to use this product, even if Krell has been advised of the possibility of such

damages.

Proof of purchase in the form of a bill of sale or receipted invoice substantiating

that the unit is within the warranty period must be presented to obtain warranty

service. The warranty begins on the date of the original retail purchase, as noted on

the bill of sale or receipted invoice from an authorized Krell dealer or distributor.

Previously owned equipment, when re-purchased from an authorized Krell dealer or

distributor, has the balance of the original warranty, based on the original date of

manufacture.

The warranty for Krell products is valid only in the country to which they were origi-

nally shipped, through the authorized Krell distributor for that country, and at the

factory. There may be restrictions on or changes to Krell’s warranty because of reg-

ulations within a specific country. Please check with your distributor for a complete

understanding of the warranty in your country.

If a unit is serviced by a distributor who did not import the unit, there may be a

charge for service, even if the product is within the warranty period.

Freight to the factory is your responsibility. Return freight within the United States

(U.S.A.) is included in the warranty. If you have purchased your Krell product out-

side the U.S.A. and wish to have it serviced at the factory, all freight and associated

charges to the factory are your responsibility.

continued

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(Warranty continued)

Krell will pay return freight to the U.S.A.-based freight forwarder of your choice.

Freight and other charges to ship the unit from the freight forwarder to you are also

your responsibility.

Krell is not responsible for any damage incurred in transit. Krell will file claims for

damages as necessary for units damaged in transit to the factory. You are respon-

sible for filing claims for shipping damages during the return shipment.

Krell does not supply replacement parts and/or products to the owner of the unit.

Replacement parts and/or products will be furnished only to the distributor per-

forming service on this unit on an exchange basis only; any parts and/or products

returned to Krell for exchange become the property of Krell.

No expressed or implied warranty is made for any Krell product damaged by acci-

dent, abuse, misuse, natural or personal disaster, or unauthorized modification.

Any unauthorized voltage conversion, disassembly, component replacement,

perforation of chassis, updates, or modifications performed to the unit will

void the warranty.

In the event that Krell receives a product for warranty service that has been modi-

fied in any way without Krell authorization, all warranties on that product will be

void. The product will be returned to original factory layout specifications at the

owner’s expense before it is repaired. All repairs required after the product has

been returned to original factory specifications will be charged to the customer, at

current parts and labor rates.

All operational features, functions, specifications, and policies are subject to

change without notification.

To register your product for warranty benefits, please complete and return

the Warranty Registration Card enclosed in the shipping box within 15 days

of purchase. Thank you.

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Return Authorization Procedure

If you believe there is a problem with your component, please contact your dealer,

distributor, or the Krell factory to discuss the problem before you return the com-

ponent for repair. To expedite service, you may wish to complete and e-mail the

Service Request Form in the Service Section of our website at:

http://www.krellonline.com

To contact the Krell Service Department

TEL

203-799-9954, Monday-Friday

9:00 AM to 5:00 PM EST

203-795-2287

FAX

E-MAIL

[email protected]

WEBSITE http://www.krellonline.com

Evolution Two

PRODUCT

MODEL NUMBER

SERIAL NUMBER

To return a product to Krell, please follow this procedure so that we may

serve you better.

1. Obtain a Return Authorization Number (R/A number) and shipping address

from the Krell Service Department.

2. Insure and accept all liability for loss or damage to the product during ship

ment to the Krell factory and ensure all freight (shipping) charges are prepaid.

The product may also be hand delivered if arrangements with the Service

Department have been made in advance. Proof of purchase will be required for

warranty validation at the time of hand delivery.

IMPORTANT

Use the original packaging to ensure the safe transit of the product to the factory,

dealer, or distributor. Krell may, at its discretion, return a product in new packaging

and bill the owner for such packaging if the product received by Krell was boxed in

nonstandard packaging or if the original packaging was so damaged that it was

unusable. If Krell determines that new packaging is required, the owner will be noti-

fied before the product is returned.

To purchase additional packaging, please contact your authorized Krell dealer, dis-

tributor, or the Krell Service Department for assistance.

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Specifications

Inputs

Volume control

Balanced, current-mode,

16-bit, discrete R-2R ladder

3 CAST via 4-pin bayonet connectors

3 balanced via XLR connectors

4 single-ended via RCA connectors

Input overload

Tape input

CAST: 11 mA RMS

Balanced: 9 V RMS

Single-ended: 18 V RMS

1 balanced via XLR connector or

1 single-ended via RCA connector,

user configurable

Output overload

Main outputs

CAST: 22 mA RMS

Balanced: 20 V RMS

Single-ended: 10 V RMS

2 CAST via 4-pin bayonet connectors

1 balanced via XLR connector

1 single-ended via RCA connector

Frequency response

Tape outputs

20 Hz to 20 kHz 0.01 dB

Balanced or single-ended inputs:

0.2 Hz to 1.3 MHz +0, -3 dB

CAST inputs:

1 balanced via XLR connector and

1 single-ended via RCA connector,

buffered, connected to main input-

selection bus

0.2 Hz to 2 MHz +0, -3 dB

1 balanced via XLR connector and

1 single-ended via RCA connector,

buffered, connected to a dedicated

record-output bus

Total harmonic distortion plus noise

Balanced Output:

<0.003%, 20 Hz to 20 kHz, 4 V RMS

CAST output: 4 mA RMS

Control inputs

1 RS-232 input via a 9-pin D-subminiature

connector

1 remote IR detector input via

a 3-conductor 3.5 mm connector

1 12 VDC trigger input via 3.5 mm

connector

Signal-to-noise ratio

4 V RMS balanced or 4 mA RMS CAST output

Wideband, unweighted: >97 dB

“A” weighted: >104 dB

Power consumption

Standby: 50 W

Power on: 80 W

1 preamplifier link via an RJ-45 connector

Power on, with KPE: 90 W

Control outputs

Dimensions

Preamplifier only:

17.3 in.W x 3.7 in. H x 18.5 in. D

43.8 cm W x 9.5 cm H x 47 cm D

2 individually programmable 12 VDC

trigger outputs via 3.5 mm connectors

1 preamplifier link via an RJ-45 connector

Power output

1 phono power output ( 20 VDC) for KPE

via a 9-pin D-subminiature connector

Power supply only:

17.3 in. W x 3.7 in. H x 17.3 in. D

43.8 cm W x 9.5 cm H x 43.8 cm D

Input impedance

CAST: 35 Ohms

Balanced: 40 k Ohms

Single-ended: 20 k Ohms

Preamplifier channel:

17.3 in. W x 7.3 in. H x 18.5 in. D

43.8 cm W x 18.5 cm H x 47 cm D

Stereo pair:

17.3 in. W x 14.6 in. H x 18.5 in. D

43.8 cm W x 37.1 cm H x 47 cm D

Output impedance

CAST: >1 M Ohms

Balanced: 250 Ohms

Single-ended: 125 Ohms

Weight

Shipped: 69 lbs., 31.2 kg

Preamplifier only: 21 lbs., 9.5 kg

Power supply only: 31 lbs., 14 kg

Gain

12 dB (CAST or balanced output)

6 dB (single-ended output)

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