ATON Stereo Amplifier A275 User Manual

A275

Two-Channel Power Ampliﬁer

INSTALLATION MANUAL

P/N 9803392 REV:B

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A275 INSTALLATION MANUAL

WARNING

RISK OF ELECTRIC SHOCK

DO NOT OPEN!

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT

REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

CAUTION: RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN

INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO

THE INSTRUCTIONS.

The lightning flash with arrowhead symbol within an equilateral triangle is intended to

alert the user to the presence of uninsulated "dangerous voltage" within the product's

enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence

of important operating and maintenance (servicing) instruction in the literature accompanying

the appliance.

WARNING: TO REDUCE THE RISK OF FIRE OR SHOCK,

DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

CAUTION

IMPORTANT SAFETY INFORMATION

Read Information—All the safety and operating information should be read before the appliance is operated.

Follow Information—All operating and use information should be followed.

Retain Information—The safety and operating information should be retained for future reference.

Heed Warnings—All warnings on the appliance and in the operating instructions should be heeded.

Wall Mounting—Mounting of this appliance should be done only by an authorized installer.

Ventilation—The appliances should be situated so that their location or position does not interfere with their proper ventilation. These appliances should never be

placed near or over a radiator or heat register. These appliances should not be placed in a built-in installation such as a bookcase or cabinet that may impede the flow of

air through the ventilation openings.

Non-Use Periods—Appliances that are left unattended and unused for long periods of time should be de-energized.

Power Sources—The appliances should be connected to a power supply only of the type described in the operating instructions or as marked on each appliance.

If you are not sure of the type of power supply to your home, consult your authorized ATON dealer or local power company.

Grounding or Polarization—Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one blade wider

than the other blade. A grounding type plug has two blades and a third grounding prong. The polarized wide blade and the third prong are provided for your safety. If

the provided plug does not fit your outlet, consult an electrician for replacement of the obsolete outlet.

Water and Moisture—To reduce the risk of electric shock or fire, these appliances should not be used near water––for example, near a bathtub, washbowl,

kitchen sink, laundry tub, in a wet basement, or near a swimming pool.

Power Cord Protection—Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles and the point where they exit

from the apparatus.

Telephones—Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote risk of electrical shock from lightning. Do not

use a telephone to report a gas leak if the leak is in the vicinity of the ATON electronic equipment because of risk of fire or explosion.

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A275 INSTALLATION MANUAL

Cleaning—Unplug the apparatus from the power outlet before cleaning. Use only a dry cloth to clean the apparatus.

Power Lines—An outdoor antenna should be located away from power lines. When installing an outside antenna system, extreme care should be taken to avoid

touching power lines or circuits, as contact with them may be fatal.

Outdoor Antenna Grounding—If an outside antenna or cable system

Grounding

Diagram

is connected to these audio products, be sure the antenna or cable system is grounded

so as to provide some protection against voltage surges and built-up static charg-

es. Section 810 of the U.S. National Electrical Code, and Section 54 of the

Canadian Electrical Code, provide information with respect to proper grounding of

the mast and supporting structure, grounding of the lead-in wire to an antenna

discharge unit, size of grounding conductors, location of antenna-discharge unit,

connection to grounding electrodes, and requirements for the grounding electrode.

See the grounding diagram (right).

ANTENNA

LEAD-IN WIRE

GROUND

CLAMPS

ANTENNA LEAD-IN WIRE

(CEC SECTION 54-200)

(NEC SECTION 810-20)

ELECTRIC

SERVICE

EQUIPMEN T

GROUNDING CONDUCTORS

(CEC SECTION 54-200)

(NEC SECTION 810-21)

Overloading—Do not overload wall outlets and extension cords, as this could

GROUND CLAMPS

result in fire or electric shock.

POWER SER VICE GROUNDING

ELECTRODE SYSTEM

(CEC SECTION 10-700)

(NEC AR TICLE 250, PA RT H)

NE C - NAT IONAL ELECTRICAL CODE

CE C - CANADIAN ELECTRICAL CODE

Object and Liquid Entry—Never insert objects of any kind through the

openings of these appliances, as they may touch dangerous voltage points or

short-out parts that could result in a fire or electric shock. Care should be taken so that

objects do not fall and liquids are not spilled into the appliance through openings in the enclosure.

Servicing—Do not attempt to service these appliances yourself, as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all

servicing to qualified service personnel.

Damage Requiring Service—These appliances should be serviced by qualified service personnel when:

• A power supply connection or a plug has been damaged or

• If liquid has been spilled into the appliance or objects have fallen into the appliance or

• The appliance has been exposed to water or moisture or

• The appliance does not appear to operate normally or exhibits a marked change in performance or

• The appliance has been dropped or the enclosure damaged.

Replacement Parts—When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or that

have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards. The Master Control Unit battery should be

replaced only after turning the power off and only by an authorized installer.

Safety Check—Upon completion of any service or repairs to this audio product, ask the service technician to perform safety checks to determine that the audio

product is in proper operating condition.

Lightning Storms—Unplug this apparatus during lightning storms or when unused for long periods of time.

Attachments and Accessories—Use only attachments/accessories specified by the manufacturer.

Cart, Stand, Tripod, Bracket or Table—Use only with a cart, stand, tripod, bracket or table specified by the manufacturer, or sold with the apparatus.

When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip over.

Disconnect Device—Where the mains plug or an appliance coupler is used as the disconnect device, the disconnect device shall remain operable.

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A275 INSTALLATION MANUAL

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A275 INSTALLATION MANUAL

Table of Contents

Purpose of This Manual

Organization............................................................................................................................................ I

Safety Information .................................................................................................................................. I

Chapter 1: Introduction

Introduction........................................................................................................................................... 1

A275 Features.................................................................................................................................................. 1

A275 Functions & Indicators ........................................................................................................................................................2

Front Panel.......................................................................................................................................................................................2

Rear Panel .................................................................................................................................................... 2

Chapter 2: A275 System Design Overview

System Design

Wiring Considerations .................................................................................................................................... 3

Applications ..............................................................................................................................................................................3-5

Amp and Speaker Selector Applications ................................................................................................ 3-4

Volume Control Applications .................................................................................................................... 5

Multi-Room Applications ...................................................................................................................... 6-7

Chapter 3: A275 Connections

Connections

Line Inputs ................................................................................................................................................... 8

Line Output................................................................................................................................................... 9

Speaker Connections.................................................................................................................................. 10

Triggers ...................................................................................................................................................... 11

Chapter 4: Operations and Settings............................................................................................................. 12

Chapter 5: Troubleshooting .....................................................................................................................13-14

Appendix A: Specifications............................................................................................................................ 15

Appendix B: Rack Mounting......................................................................................................................16-17

Warranty......................................................................................................................................................... 20

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A275 INSTALLATION MANUAL

A275

Power Ampliﬁer

Items in package:

• A275 Two-Channel Power Amplifier

• Rack Mount Brackets

• Installation Manual

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Chapter 1: Introduction

Thank you for purchasing the ATON A275 Two-Channel Power Amplifier. Soon you will be experiencing the quality and reliability we

place in all of our products. The backbone of any distributed audio system is the amplification. The true test of any amplifier is the abil-

ity to drive multiple speakers at low impedance for hours on end. In this arena, the A275 excels! Heat is the number cause for amplifier

failure, or temporary audio loss from thermal shutdown protection circuitry, a.k.a. overheating. Of course that typically happens when

you are entertaining a house full of guests! ATON designed the A275 with 2 long rows of external cooling fins to increase the heat dis-

sipation capability. Higher cooling capacity equals longer product life, cleaner audio signal, and of course, more satisfied customers!

A275 Features

• 2 x 45 Watts per Channel @ 8 Ohms

• 2 x 75 Watts per Channel @ 4 Ohms

Buffered Line Outputs

• Allow the signal to be sent to other A275 amplfiers, A/V receivers, etc.

System Trigger In/Out

• SYSTEM TRIGGER IN allows all channels of the amplifier to UNMUTE when a signal is received.

• SYSTEM TRIGGER OUT sends a +12VDC pulse whenever any of the channels of the amplifier are UNMUTED.

Individual Channel Level Adjustment

• Fine-tune each channel’s level using precision potentiometers.

5-Way Speaker Binding Post

• The A275 is equipped with gold plated, 5-way speaker binding posts. This allows for five methods of speaker wire termination:

bare wire, Spade lug, pin, single banana and dual banana plug.

Safety Concerns

Use only grounded outlets when powering this product. Making any modification to the power cord could cause unsafe operation and

will void the manufacturer’s warranty.

AC Power Considerations

The A275 requires 3.7 Amps of AC current. When designing any whole house system using multichannel amplifiers, make sure to

provide adequate provisions for all electronic equipment to be installed. This may require additional outlets and/or circuit breakers to

be installed. Consult a licensed electrician in this case.

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A275 INSTALLATION MANUAL

A275 Front Panel Functions and Indicators

FRONT

Figure 1-1: A275 Front Panel

Table 1-1:Front Panel

ITEM

FUNCTION

Channel Gain Potentiometers (2)

POWER LED Glows blue when power switch is ON and unit is plugged in.

A275 Back Panel

Figure 1-2: A275 Back Panel

BACK

Item Function

Table 1-2: Back Panel

Channel Gain Potentiometers (2)

ITEM

FUNCTION

Pull-Out Access Door

POWER SWITCH

POWER LED - Glows Blue When Power Switch is ON and Unit Plugged In

POWER CORD

SPEAKER OUTPUTS

SYSTEM TRIGGER IN/OUT

LINE OUTPUTS

LINE INPUTS

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Chapter 2. System Design & Applications

System Design

The A275 is designed to drive multiple pairs of indoor or outdoor speakers from virtually any audio source. A typical installation con-

sists of a home theater receiver zone 2 or zone 3 line level output feeding the A275. The A275 amplified outputs can drive speakers,

volume controls, or ATON DLA speaker routers depending upon the application. The advantage of using a DLA along with the A275 is

the ability to drive multiple pairs of speakers while enjoying the benefits of the DLA Router: automatic impedance protection, dynamic

volume level adjustment, discrete IR remote control, and RF remote control. The A275 is designed to drive one or more DLA’s including

the DLA2, DLA4, or DLA6. If you need additional DLA configuration and setup assistance, please refer to the DLA installation manual.

Wiring Considerations

Speaker Wires

Audio Cables

Triggers

14-16 AWG Speaker Wire

RCA Patch Cables

2 Conductor Wires with 3.5mm mono connector

SETTING UP THE A275 WITH A DLA SPEAKER SELECTOR

A275 Speaker Outputs

RED

WHITE

HOME THEATER RECEIVER

Line Level

GREEN

BLACK

Analog Audio

Output

DLA Speaker Inputs

A275

AMPLIFIER

INPUTS

SPEAKER

OUTPUTS

8Ω

4Ω

8Ω

4Ω

DLA4 SPEAKER SELECTOR

(DLA2, DLA4, or DLA6 can be used)

SPK

SPK SPK

SPK

8Ω

4Ω

8Ω

4Ω

IMPORTANT!

In this application, the DLA's

"AMP" switch should be in the

down or "4" Ohm position. Set

the "SPKR" switch to the "4" or

"8" Ohm position depending on

the impedance of the speakers

being used.

HOME THEATER RECEIVER

Line Level

Analog Audio

Figure 2-1: A275 and DLA SPEAKER SELECTOR

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Wiring Considerations

Speaker Wires

Audio Cables

Triggers

14-16 AWG Speaker Wire

RCA Patch Cables

2 Conductor Wires with 3.5mm mono connector

4Ω

SETTING UP THE A275 WITH MULTIPLE DLA SPEAKER SELECTORS

A275 Speaker Outputs

HOME THEATER RECEIVER

WHITE

RED

Line Level

GREEN

BLACK

Analog Audio

Output

DLA Speaker Inputs

A275

AMPLIFIER

INPUTS

SPEAKER

OUTPUTS

8Ω

4Ω

8Ω

4Ω

DLA4 SPEAKER SELECTOR 1

(DLA2, DLA4, or DLA6 can be used)

SPK

SPK SPK

SPK

AMPLIFIER

INPUTS

SPEAKER

OUTPUTS

8Ω

4Ω

8Ω

4Ω

DLA4 SPEAKER SELECTOR 2

(DLA2, DLA4, or DLA6 can be used)

SPK

SPK SPK

SPK

IMPORTANT!

In this application, the DLA's

"AMP" switch should be in the

UP or "8" Ohm position. Set the

"SPKR" switch to the "4" or "8"

Ohm position depending on the

impedance of the speakers being

used.

8Ω

4Ω

8Ω

4Ω

Figure 2-2: A275 and MULTIPLE DLA SPEAKER SELECTORS

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A275 INSTALLATION MANUAL

Applications

4/6/8 Ohm Speakers with Volume Controls

• Audio Output to Line Inputs 1 & 2

Speakers

Line Level

Analog Audio

Output

ATON

VOLUME

CONTROL

AVC100R

or AVC100SL

A275

Figure 2-3: 4/6/8 Ohm Speakers w/ Volume Controls

Using A275 with Impedance Match Volume Controls and Maximum Speaker Wattage

Volume Control

Impedance Match Setting

8 Ohm

Speaker Pairs

Max Wattage

Available Per

Speaker

6 Ohm

Speaker Pairs

Max Wattage

Available Per

Speaker

4 Ohm

Speaker Pairs

Max Wattage

Available Per Speaker

18.0

12.0

6.0

24.0

18.0

9.0

36.0

24.0

12.0

1.0

1.5

NOT RECOMMENDED

System Design Considerations

Adding multiple speakers to a power amplifier reduces the amount of power sent to each speaker as the total available wattage is

divided among the connected speakers. Beyond customer volume preferences, several factors affect overall amplifier output including

input signal gain, impedance, AC voltage, wire run length and gauge, insertion losses with volume controls, room size, etc. This chart

assumes simple math and does not represent actual dB, SPL calculations, etc. It is provided as a guideline only to demonstrate theory

& provide some basic design guidance. You can never overpower a system because you have dynamic headroom, or spare power as

needed. If you underpower / underamplify a system, the amplifier tends to be pushed past its safety zone which eventually leads to

clipping and system failure.

Indoor applications for background audio need only be a few watts, typically 1 to 10. For primary listening areas, you should plan on 5

to 20 watts or more depending upon application. Outdoor applications require a greater amount of power since there is little reflectivity

of sound and listening area is larger, so plan on 40 watts or more!

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A275 INSTALLATION MANUAL

Multi-Room

Stereo Sub-Zones

ATON’s AH66T Integrated Multi-Room Controller has built-in amplification for six stereo zones as well as six sets of preamp outputs for

the addition of sub-zones. The A275 is ideally suited to amplify outdoor subzones using rotary or electronic volume controls if separate

volume up/down functionality is desired in the sub-zones as shown in the AH66T example below.

AH66T Stereo Sub-Zones

• Preamp Output 1 & 2 to Line Inputs 1 & 2

• Preamp DIP Switches in VARIABLE Position

Each Zone and Sub-Zone Speakers Volume Ramps Together

Speakers

Variable (UP)

AH66T MULTI-ROOM CONTROLLER

ATON

VOLUME

CONTROL

AVC100R

or AVC100SL

A275

Figure 2-4: AH66T Sub-Zones

IMPORTANT NOTE

Please see chart on previous page for impedance match settings and volume controls

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AH66T Stereo Sub-Zones

• Preamp Output 1 & 2 to Line Inputs 1 & 2

• Preamp DIP Switches in FIXED Position

• Volume Controls on Each Speaker Output

Each Zone and Sub-Zone Has Independent Volume Control

Outdoor

Speakers

Outdoor

Speakers

Fixed (DOWN)

AH66T MULTI-ROOM CONTROLLER

ATON

VOLUME

CONTROL

AVC100R

or AVC100SL

A275

Figure 2-5: AH66T Sub-Zones

IMPORTANT NOTE

Please see chart on previous page for impedance match settings and volume controls

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Chapter 3: Connections

The A275 has several rear panel connections so it is important to label all cables and wires correctly. Label all input/output cable and

speaker wires with their destination or source. This will save time during installation and any future upgrades to the system.

Use high quality line level RCA connector type cables for source connections to ensure the lowest possible noise and best sound per-

formance. For most applications use 16AWG 2 conductor speaker cable. For wiring runs longer than 80 ft. it is recommended to use

14AWG 2 conductor speaker cable. The A275's high quality, gold plated 5-way binding post will accommodate speaker cabling sizes up

to 12AWG. Attaching banana plugs will enable the connection of larger cable sizes. A 3.5mm mono interconnect cable may be used for

amplifier and systems triggering.

Line Level Audio Inputs

Connect the zones by inserting the RCA connectors into the dedicated direct input jack on each channel.

From Audio

Output Source

A275

RCA Patch

Cable

Figure 3-1: Line Inputs

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A275 INSTALLATION MANUAL

Line Ouputs

A stereo or monaural audio signal connected to the A275’s main LINE INPUT is routed to the A275’s RCA Line Outputs. This feature is

excellent for standalone distributed audio systems where one source (i.e. an A/V Receiver) is providing audio to the entire home, and also

for ATON multi-room applications where a zone’s audio signal needs to be routed to multiple amplifier channels. Examples of both these

applications are shown in the Chapter 2.

Line audio outputs enable connection of additional amplifiers to allow further system expansion. Use high quality RCA interconnect

cables to ensure low noise and great sound. The A275 Line Outputs are buffered, a maximum of four amplifiers may be 'daisy-chained'

to each Line Outputs.

From Audio

Output Source

A275 #1

RCA Patch

Cable

RCA Patch

Cable

A275 #2

To A275s

#3-4

Figure 3-2: Line Outputs

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Speaker Binding Post

The A275 is equipped with gold plated, 5-way speaker binding posts. This allows five methods of speaker wire termination: bare wire,

spade lug, pin, single banana and dual banana plug. Label all speaker wires with their destination to ensure easy configuration. To attach

speaker wires use the following method:

1. Carefully split the speaker wire insulation at least two inches.

2. Strip 1/2 inch of the insulation from the speaker wire conductor exposing the bare wire.

3. Twist the wire strands of each conductor, if using banana plugs, attach wire to banana plug observing polarity.

4. If using banana plug; insert plug ends into binding post observing correct polarity. If using the bare wire method; loosen the

binding post caps and insert the bare wire through the hole in the post. Tighten the knob until the wire is securely clamped.

CAUTION! Speaker Wire connections must be made with the amplifier OFF!

Banana Plugs

1/2’

Speaker Wire

WHITE

RED

A275 Amplifier

Binding Post

BLACK

GREEN

WARNING: Do not allow any strands

of the bare speaker wire to touch

the Amplifier Chassis or another

Connector.

Figure 3-3: Speaker Binding Post

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Triggers

A REMOTE TRIGGER IN port allows all channels to turn on or mute simultaneously. The REMOTE TRIGGER INPUT can receive 5-24 Volts

AC or DC. The 12 Volt DC REMOTE TRIGGER OUT can be used to turn on other equipment, additional A275s or other amplifiers, or to

perform automated functions desired by the user. Use 3.5mm mono interconnect cables to make Trigger connections.

SYSTEM TRIGGER IN

To mute/un-mute all channels simultaneously, connect a system-wide 5-24 Volt DC triggering source to the SYSTEM TRIGGER IN port

using a 3.5mm mono interconnect cable. Examples of triggering sources include an ATON Multi-Zone Controller’s SYSTEM

TRIGGER OUT or REMOTE OUT, an A/V receiver’s switched outlet connected to a power supply, or a +12VDC TRIGGER OUT from another

ATON amplifier.

3.5mm mono interconnect cable

AH66T

A275

Figure 3-4: Remote Trigger In

SYSTEM TRIGGER OUT

Whenever the A275 is powered ON, the REMOTE TRIGGER OUT becomes active. This output sends a +12VDC 100mA signal to other

devices with a Trigger Input.

From AH66T

To A275’s

#3-4

3.5mm mono interconnect cable

A275 #1

A275 #2

Figure 3-5: Remote Trigger Out

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Chapter 4: Operations & Settings

Setting Channel Levels

The A275 features independent Level Adjustment Potentiometers for each of its two channels. Use a small Phillips screwdriver to inde-

pendently adjust each channel of the amplifier for the specific speakers and environmental conditions of the area it is powering. Turning

the potentiometer clockwise increases the level, while turning it counter-clockwise decreases the level. Factory default is 85%.

Set the levels by first lowering them all the way down, then raise the volume of any keypads or volume controls to maximum. Slowly

increase the level of the channel being adjusted by turning the potentiometer clockwise until the channel begins to distort, then reduce the

level slightly (turn counter-clockwise) until distortion is no longer present. Follow this procedure for each channel.

LEVEL

Factory

Factory Default

Default 50%

is 85%

Figure 4-1: Level Adjustment Potentiometers

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Chapter 5: Troubleshooting

Symptom

Possible Cause

Solution

No Audio From One or

More Channels

1. Loose/bad speaker cable connection

2. Break/short in speaker cable

1. Check cable ends at binding posts and

speaker terminals.

2. Check continuity of each speaker cable

using multimeter. If short or open is indi-

cated, check wiring for proper connections.

3. Swap with known good speaker.

3. Speaker is defective

4. Swap with known good patch cable.

4. RCA patch cable defective

5. Source not sending audio

5. Verify source is powered up and playing.

Check any tape monitor settings on A/V

Receiver.

No Audio From One Channel

Amplifier is overheating due to

inadequate ventalation or prolonged opera- internal circuits to cool.

tion at clipping levels.

1. (a) Turn the amplifier off and allow the

(b) Ensure that the amplifier has proper

ventilation. Add cooling fan if necessary.

channel pair.

Unit may require service.

Audio input cable is bad.

Contact ATON Technical Support.

Very Low or No Sound on Some or All

Channels

Check source equipment cables for damage

and faulty connections and correct.

Audio “Hum”

1. Ground potential difference between

source components (ground loop)

1. (a) Test AC outlet using ground tester.

(b) Reverse the AC plug of components

with non-polarized ends plugged into the

same outlet strip as amp.

2. Faulty/damaged cables

3. Faulty wiring

2. Check source equipment cables for dam-

age and faulty connections.

3. (a) Make sure volume controls are not

hooked up backwards.

(b) Check for shorts in wiring (see item

2 in “No audio…”).

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Symptom

Possible Cause

Solution

Distorted Audio at Normal

Volume Levels

1. Input gain set too high

1. Reduce gain to the channel in question.

2. (a) Check for physical damage to

speaker.

2. Defective/incompatible speaker

(b) Ensure speakers have appropriate

power rating for amplifier.

impedance. This amp is compatible with

speakers with 8 Ohm impedance or greater.

3. Check for proper input/output connec-

tions at volume control. Input comes from

amplifier, output goes to speakers.

3. Volume control wired incorrectly

4. Verify/correct Impedance Match settings.

4. Volume control Impedance Match

settings incorrect

Audio is Unclear, Bass

Response Low

Speakers out of phase

Verify that + of amplifier goes to +of speak-

er and - of amplifier goes to - of speaker

on ALL speaker leads.

Incorrect Source Playing

on Speakers

1. Source connected to wrong

input of amplifier

1. Verify/correct input connections.

2. Verify/correct speaker connections.

3. Verify/correct DIP switch settings.

2. Speakers connected to incorrect

speaker outputs

3. DIP switches set incorrectly

1. Power switch is Off

Amplifier Will Not

Power Up

1. Turn switch On. Switch is located on the

back of unit.

2. Circuit breaker tripped

2. Reset circuit breaker. Ensure that com-

bined current draw of all devices on circuit

does not exceed the circuit’s capacity.

Technical Support

If, after carefully following the steps in the Troubleshooting section, you are unable to

resolve issues with the installation or operation of the A275, please call ATON Technical

Support at 1 (859) 422-7137 Option 3.

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A275 INSTALLATION MANUAL

Appendix A: Specifications

Audio Section

2 x 45 WPC @ 8 Ohms

2 x 75 WPC @ 4 Ohms

Power Rating - Output Power

Frequency Response

20Hz to 20kHz, -.5dB

5Hz to 30kHz

Full Power Bandwidth

Signal-To-Noise

> 110dB (A-weighted)

>70dB @1kHz

Channel Separation

< .01% @ 1kHz

< -90dB

Total Harmonic Distortion

Intermodulation Distortion

0 - 28, front panel adjustable

33k Ohms

Voltage Gain (AV)

Input Impedance

Connectors

Gold RCA Phono

Input/Loop Outputs

Gold 5 Way Binding Posts

Speaker Outputs

Power

120 VAC, 440 Watts

3.7A @120VAC

AC Power Requirements

Current Draw

Triggers

Remote Trigger Inputs

Remote Trigger Outputs

Dimensions/Weight

5 to 24V AC/DC

+12 VDC @0.1A

17 W x 2 3/8 H x 11 D (in)

432 W x 60 H x 280 D (mm)

Dimensions w/ Feet (1U w/o Feet)

Weight

15 lbs/6.8 kg

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Appendix B: Rack Mounting

Rack-Mount Bracket

When mounting the A275 amplifier in an equipment rack, use the included rack mount brackets for secure mounting and proper ventila-

tion. The A275 requires one rack space, ensure that one rack space above and below the A275 is left open for proper ventilation.

To install the A275 into a standard 19” equipment rack:

1. Slide the rack mount kit onto the A275 chassis from the front as shown in Figure B-1.

Figure B-1

2. Ensure that the unit is flush with the front of the mounting kit. Install each of the eight screws (included) through the side mounting

flanges into the holes in the sides of the unit as shown in Figure B-2. Hand tighten screws! Over-tightening could cause damage

to the A275 Amplifier.

Figure B-2

Page 16

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A T O N

A275 INSTALLATION MANUAL

3.Once the unit is securely mounted, install the entire assembly into a standard 19” equipment rack from the front using four rack

screws (not included) as shown in Figure B-3.

19" Equipment Rack

Rack Screws

Figure B-3

Page 17

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A T O N

A275 INSTALLATION MANUAL

NOTES:

Page 18

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A T O N

A275 INSTALLATION MANUAL

NOTES:

Page 19

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LIMITED WARRANTY

Aton (“ATON”) warrants the ATON A275 Two-Channel Power Amplifier to be free from defects in materials and work-

manship for the period of two years (2 years) from the date of purchase. If within the applicable warranty period the

purchaser discovers that such item was not as warranted above and promptly notifies ATON in writing, ATON shall

repair or replace the item at the company’s option. This warranty shall not apply (a) to equipment not manufactured

by ATON, (b) to installed equipment which is not installed to ATON’s specifications, (c) to equipment which shall have

been repaired or altered by others than ATON, (d) to equipment which shall have been subjected to negligence, ac-

cident, or damaged by circumstances beyond ATON’s control, including, but not limited to, lightning, flood, electrical

surge, tornado, earthquake, or other catastrophic event beyond ATON’s control, or to improper operation, maintenance

or storage, or to other than normal use of service. With respect to equipment sold by, but not manufactured by ATON,

the warranty obligations of ATON shall in all respects conform to the warranty actually extended to ATON by its supplier.

The foregoing warranties do not cover reimbursement for labor, transportation, removal, installation or other expenses

which may be incurred in connection with repair or replacement.

Except as may be expressly provided and authorized in writing by ATON, ATON shall not be subject to any other obliga-

tions or liabilities whatsoever with respect to equipment manufactured by ATON or services rendered by ATON.

THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESSED AND IMPLIED WARRAN-

TIES EXCEPT WARRANTIES OF TITLE, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANT-

ABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

ATTENTION: TO OUR VALUED CONSUMERS

To ensure that consumers obtain quality pre-sale and after-sale support and service, ATON products are sold exclusively

through authorized dealers, ATON products are not sold online. The warranties on ATON products are NOT VALID if the

products have been purchased from an unauthorized dealer or an online E-tailer. To determine if your ATON reseller is

authorized, please contact ATON at (859) 422-7137 Option 3

www.atonhome.com

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v a d o s r . e s e r

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P á g i n a

A L A C I I N Ó S N D T E

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