ZX-7 / RX-7 Power Amplifier
User Guide
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IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
12. Only use attachments/accessories specified by the
maximum ambient operating temperature
listed in the product specification.
manufacturer.
13. Use only with the 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.
•
Never attach audio power amplifier outputs
directly to any of the unit’s connectors.
4. Follow all instructions.
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to
Part 15 of FCC Rules. These limits are designed to
provide reasonable protection against harmful inter-
ference in a residential installation. This equipment
generates, uses, and radiates radio frequency energy
and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
or television reception, which can be determined by
turning the equipment off and on. The user is encour-
aged to try to correct the interference by one or more
of the following measures:
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in
accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as
radiators, heat registers, stoves, or another
apparatus (including amplifiers) that produces heat.
14. Unplug this apparatus during lightning storms or
when unused for long periods of time.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding-
type plug has two blades and a third grounding
prong. The wide blade or the third prong are
provided for your safety. If the provided plug does
not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
15. Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as when a power-supply
cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture,
does not operate normally, or has been dropped.
•
•
Re-orient or relocate the receiving antenna.
Increase the separation between the equipment
and the receiver.
•
•
Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected.
10. Protect the power cord from being walked on or
pinched particularly at plugs, convenience recep-
tacles, and the point where they exit from the
apparatus.
•
Refer to the manufacturer’s operating
instructions for power requirements. Be
advised that different operating voltages may
require the use of different line cord and/or
attachment plug.
Consult the dealer or an experienced electronic
technician for help.
11. Main Plug is considered to be the disconnect
device for this product and shall remain readily
operable.
•
Do not install the unit in an unventilated rack,
or directly above heat-producing equipment
such as power amplifiers. Observe the
To reduce the risk of fire or electric
This triangle, which appears on your component,
alerts you to the presence of uninsulated,
dangerous voltage inside the enclosure -
voltage that may be sufficient to
constitute a risk of shock.
This triangle, which appears on your component,
alerts you to important operating and
maintenance instructions in this
shock, do not expose this apparatus to
WARNING
CAUTION
rain or moisture. Do not place objects
containing liquid, such as vases, on this
apparatus.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
accompanying literature.
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Lexicon Inc.
3 Oak Park Drive
Bedford, MA 01730-1413 USA
Tel
Fax
781-280-0300
781-280-0490
Customer Service
Telephone:
Fax:
email: [email protected]
781-280-0300
781-280-0499
Lexicon and the Lexicon logo are registered trademarks of Harman International Industries, Inc. U.S. Patent Nos. D454,553;
D454,860; 5,796,844; 5,870,480 and other worldwide patents issued and pending.
© 2007 Harman International Industries, Incorporated. All rights reserved.
This document should not be construed as a commitment on the part of Harman Specialty Group. The information it contains is
subject to change without notice. Harman Specialty Group assumes no responsibility for errors that may appear within this
document.
Part No. 070-18130 | Rev 0 | 03/07
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Introduction
Lexicon
DOCUMENTATION CONVENTIONS
This document contains general safety, installation and operation instructions for the RX-7 and ZX-7 Power Amplifiers. It is important to read
this user guide before attempting to use the product. Pay particular attention to safety instructions.
The following symbols are used in the document:
Appears on the component to indicate the
presence of uninsulated, dangerous voltage
inside the enclosure – voltage that may be
sufficient to constitute a risk of shock.
Appears on the component to indicate
important
operating
and
maintenance
instuctions in the accompanying literature.
Calls attention to
a
procedure, practice,
WARNING
condition or the like that, if not correctly
performed or adhered to, could result in injury
or death.
Calls attention to
a
procedure, practice,
CAUTION!
condition or the like that, if not correctly
performed or adhered to, could result in
damage or destruction to part or all of the
product.
Note:
Calls attention to information that is essential to
highlight.
ii
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ZX-7 / RX-7
Introduction
Table of Contents
iii
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Getting Started
Lexicon
ABOUT THE ZX-7 AND RX-7
Congratulations and thank you for purchasing your new Lexicon
Power Amplifier. This is a reference-quality amplifier designed to
meet the highest standards of power and performance under the
most extreme operating conditions. Equipped with advanced
thermal, current, DC, and speaker protection, your new amplifier
delivers reliable and exceptional performance with most
loudspeakers, including mismatched, reactive, and unusual loads.
With embedded protection against short circuits, component
failures, mis-wiring, and internal faults, the incredible power and
wide-ranging flexibility of the ZX-7 and RX-7 amplifiers confirm
that they are at home in the most sophisticated and demanding
home theaters.
be controlled with associated components such as the MC-12HD or
MC-8 Digital Controllers. The ZX-7 and RX-7 amplifiers include
advanced optically coupled protection for each channel.
In order to receive the maximum peak performance from your
Lexicon amplifier, please take a few minutes and completely read
this manual. This important information will help you make certain
that these Lexicon amplifiers are properly configured for operation
with the rest of the equipment within your system.
PRODUCT REGISTRATION
Both the ZX-7 and RX-7 are fully balanced power amplifiers from
input to output with completely symmetrical circuit design. In
other words, each channel consists of two complete amplifier
circuits; one driving the positive input signal and the other driving
the negative input signal. With 7 channels, this translates into 14
separate amplifier circuits per chassis. The advantage of this
topology over single-ended designs is that it exhibits lower noise,
lower distortion, immunity from stray electronic fields and
anomalies in the input signal from outside interference. This results
in significant audible benefits including increased overall clarity and
more pronounced differences between soft and loud passages.
Internally, the ZX-7 and RX-7 both utilize two massive toroidal
transformers and lots of filter capacitance to ensure rock-solid low-
frequency reproduction and ample power reserves.
Please register your new amplifier within 15 days of purchase.
complete and return the product registration card attached to the
back cover of this user guide. Retain the sales receipt as proof of
warranty coverage.
The ZX-7 delivers 300 Watts per channel into 8 Ohms, while the
RX-7 delivers 200 Watts per channel into 8 Ohms.
Equipped with gold-plated speaker output connectors, the rear
panel includes balanced or unbalanced audio input via RCA and
XLR connectors. A trigger input connector allows the amplifiers to
1-2
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ZX-7/RX-7
Getting Started
INSTALLATION CONSIDERATIONS
HIGHLIGHTS
•
ZX-7: 300 Watts per channel @ 8 Ohms
RX-7: 200 Watts per channel @ 8 Ohms
To ensure optimal performance, pay particular attention to the
instructions below and to other precautions that appear
throughout this user guide.
•
Dual oversized toroidal power transformers with extraordinarily
low DC resistance and thermal protection
DO be careful when moving the amplifier, as it is very heavy.
•
•
•
•
•
High-power supply voltage for extra headroom at the outputs
Stable with mismatched, reactive, or unusual loads
Thermal protection against overheating
DO install the ZX-7/RX-7 on a solid, flat, level surface such as a table
or shelf. The ZX-7/RX-7 can also be installed in a standard 19-inch
equipment rack using an optional rack-mount kit available from an
authorized Lexicon dealer.
Speaker protection against DC and frequencies below 10Hz
Protection against short circuits, device failures, mis-wiring, and
internal faults
DO select a dry, well-ventilated location out of direct sunlight.
•
•
•
•
•
•
•
Trigger input for power control from an external device
RCA and XLR inputs
DO NOT install the ZX-7/RX-7 on a surface that is unstable or
unable to support all four feet.
Gold plated input and output connectors
Rack-mount option available
DO NOT expose the ZX-7/RX-7 to high temperatures, humidity,
steam, smoke, dampness or excessive dust. Avoid installing the
amplifier near radiators and other heat-producing appliances.
Noise elimination
Delayed audio turn-on to eliminate noises from driving equipment
DO NOT install the ZX-7/RX-7 near unshielded TV or FM antennas,
cable TV decoders, or other RF-emitting devices that might cause
interference.
Completely symmetrical circuit design which ensures optimal
audio sonality
•
•
•
Hefty power supplies with lots of filter capacity ensures rock-solid
bass
DO NOT place the ZX-7/RX-7 on a thick rug or carpet, or cover the
ventilation holes in the chassis, as this might prevent proper cooling.
High damping factor (no output relays) ensure realistic, impressive
bass transients
DO NOT place the ZX-7/RX-7 on a windowsill or any location
exposed to direct sunlight.
Advanced protection circuitry ensures reliability under any sort of
user abuse
DO NOT stack the ZX-7/RX-7 directly above heat-producing
equipment such as another power amplifier.
1-3
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2
Basic Operation
Standby Button ........................................................................................ 2-3
Remote Trigger Power On ........................................................................ 2-9
Power Connection Safety ....................................................................... 2-10
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ZX-7/RX-7
Basic Operation
STANDBY BUTTON
Activates and deactivates standby mode when the ZX-7/RX-7 amplifier is powered on with the rear panel power switch. The standby button (1)
performs no function when the amplifier is powered off with the rear panel power switch.
When the amplifier is on, pressing the standby/on button activates standby mode and deactivates the power amplifier. While in standby mode,
the front panel LED is red. Power is still supplied to the ZX-7/RX-7 when it is in standby mode.
When the unit is in standby, pressing the standby/on button deactivates standby mode and activates the power amplifier. While the ZX-7/RX-7
is activated, the front panel LED is blue.
Note:
When the status of the ZX-7/RX-7 changes or is powered up, there may be a delay in audio output and relay clicks may be audible. This is normal operation.
Standby/On
Button
2-3
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Basic Operation
Lexicon
REAR-PANEL ZX-7 230 VAC OVERVIEW
The ZX-7 230 VAC rear panel is shown below. The ZX-7 120 VAC rear panel is shown on page 2-5. The numbers in the rear-panel illustrations
correspond with the numbered description items.
3
INPUTS
CENTER
TRIGGER INPUT
CHASSIS
GROUND
RIGHT
RIGHT SIDE
RIGHT REAR
LEFT REAR
LEFT SIDE
LEFT
1
4
5
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
1
1
2
1
2
1
2
2
1
2
2
1
2
1
2
3
3
3
3
3
3
3
ZX-7
Class 2 Wiring
OUTPUTS
—
—
—
—
—
—
—
+
+
+
+
+
+
+
7
6
RIGHT
RIGHT SIDE
RIGHT REAR
CENTER
LEFT REAR
LEFT SIDE
LEFT
1. Unbalanced Input Connectors
2. XLR Balanced Input Connectors
3. Chassis Ground
5. Master Power Switch/Circuit Breaker
6. AC Power Connector
7. Speaker Output Connectors
4. Remote Trigger
2-4
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ZX-7/RX-7
Basic Operation
REAR-PANEL ZX-7 120 VAC OVERVIEW
3
INPUTS
CENTER
TRIGGER INPUT
CHASSIS
RIGHT
RIGHT SIDE
RIGHT REAR
LEFT REAR
LEFT SIDE
LEFT
GROUND
1
2
4
5
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
1
1
2
1
2
1
2
2
1
2
2
1
2
1
3
3
3
3
3
3
3
ZX-7
UE
Class 2 Wiring
OUTPUTS
6
—
—
—
—
—
—
—
+
+
+
+
+
+
+
7
RIGHT
RIGHT SIDE
RIGHT REAR
CENTER
LEFT REAR
LEFT SIDE
LEFT
1. Unbalanced Input Connectors
2. XLR Balanced Input Connectors
3. Chassis Ground
5. Master Power Switch/Circuit Breaker
6. AC Power Connector
7. Speaker Output Connectors
4. Remote Trigger
2-5
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Basic Operation
Lexicon
REAR-PANEL RX-7 OVERVIEW
3
INPUTS
CENTER
CHASSIS TRIGGER INPUT
GROUND
RIGHT
RIGHT SIDE
RIGHT REAR
LEFT REAR
LEFT SIDE
LEFT
1
2
4
5
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
PUSH
1
2
2
1
1
1
1
2
2
1
1
2
2
2
3
3
3
3
3
3
3
RX-7
LEXICON
DESIGNED AND
ASSEMBLED IN U.S.A.
SERIAL NO.
DO NOT OPEN
NE PAS OUVRIR
Class 2 Wiring
OUTPUTS
—
—
—
—
—
—
—
+
+
+
+
+
+
+
6
7
RIGHT
RIGHT SIDE
RIGHT REAR
CENTER
LEFT REAR
LEFT SIDE
LEFT
1. Unbalanced Input Connectors
2. XLR Balanced Input Connectors
3. Chassis Ground
5. Master Power Switch/Circuit Breaker
6. AC Power Connector
7. Speaker Output Connectors
4. Remote Trigger
2-6
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ZX-7/RX-7
Basic Operation
1 & 2 UNBALANCED/BALANCED INPUT 1 TO 7
CONNECTORS
4 REMOTE TRIGGER INPUT
Enables the ZX-7/RX-7 to be controlled by the MC-12HD/MC-8 or
other external devices with a 3.3V DC minimum to 24V DC
maximum trigger output. Connect the trigger output of the
external device to the TRIGGER INPUT of the ZX-7/RX-7 amplifier.
The ZX-7/RX-7 will automatically respond when the external device
is powered on and off. When the controlling device is turned on,
the amplifier will turn on after a delay. This delay is intentional and
serves to protect the speakers while the unit stabilizes. During
start-up, you may hear relay clicking. This is normal operation
Provides audio input for the speakers connected through the
unbalanced (RCA) inputs or balanced (XLR) inputs.
The illustration below shows the appropriate cable pin-out for XLR
connectors.
2 = Positive
5 MASTER POWER SWITCH
Male
Cable End
Connects and disconnects power from the AC Input Connector to
the Amplifier Power Supply. When this switch is on, the front panel
standby/on LED illuminates. When it is off, the front panel
standby/on button will not function. Set this switch to off when
making or breaking connections to the amplifier. The Master Power
Switch also serves as a breaker.
3 = Negative
1 = Ground
Caution!
Never make or break connections to the ZX-7/RX-7 unless
the ZX-7/RX-7 and all associated components are
powered off.
To power on the ZX-7/RX-7, press the rear panel master power
switch. The ZX-7 120V AC includes 2 power switches. You must
power both switches on or off. When powered on, the front panel
LED will light. There will be a delay from the time the power is
turned on until the power is applied to the speakers. This is normal
operation and protects the speakers from potential damage while
the unit stabilizes. You may hear a relay click during start-up, which
is also normal operation.
WARNING
Do not connect the outputs of one channel to the outputs
of other channels or to other amplifiers.
3 CHASSIS GROUND
Provides a means of grounding the power amplifier to another
component within your configuration in order to eliminate ground
loop.
Your power amplifier is supplied with a heavy-duty magnetic circuit
breaker. With the ZX-7 120V AC unit, there are 2 heavy duty
magnetic circuit breakers. If power to the amplifier is interrupted,
inspect the circuit breaker on the rear of the unit. If the circuit
breaker is in the OFF position you can reset it to the ON position to
2-7
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Basic Operation
Lexicon
restore AC power. If the circuit breaker immediately trips to the OFF
position, unplug the amplifier from the AC power source and
contact Lexicon Customer Service.
WARNING
Note:
The 120 VAC version of the RX-7 requires a dedicated
circuit with a single 20 Amp outlet installed. The 20 Amp
outlet has a different prong configuration from the 15
Amp outlet. Dedicated circuits typically are connected
directly to the service entrance of the building.
The Class 2 Wiring label is required for any unit in which the audio output
power exceeds 10W per channel under normal operating conditions or if
the unit is intended to be installed or connected by a skilled person.
CAUTION!
The 120 VAC version of the ZX-7 has two power cords.
Each power cord must be plugged in to a separate 15 Amp
circuit. Separate circuits typically are connected to
different circuit breakers at the service entrance of the
building.
When the ZX-7/RX-7 master power switch is switched off
or there is a power outage, the state of the unit remains
the same when power is restored. If in standby mode (red
LED) when the power is removed, it will remain in standby
mode when power is restored. If the unit is in active mode
(blue LED) and power is removed, it will remain activated
when power is restored. It is recommended that the
ZX-7/RX-7 be set to standby mode before being powered
off to prevent potential damage to the unit or your
speakers. If the ZX-7/RX-7 is not trigger-connected to a
controlling device, such as the MC-12HD/MC-8 which
comes out of power loss and recovery in standby mode
with a known volume setting, there is a potential for
damage to the speakers if power is lost and restored with
the ZX-7/RX-7 in active mode.
Do not attempt these wiring changes by yourself, instead
hire a licensed qualified electrician.
CAUTION!
Never make or break connections to the ZX-7/RX-7 unless
the ZX-7/RX-7 and all associated components are
powered off.
7 SPEAKER OUTPUT CONNECTORS
Provide audio output for the speakers. Output connectors can
accept bare speaker wires, or most spade connectors. When using
bare speaker wires, loosen the connector, insert the wire into the
top of the receptacle, then tighten the connector. The same
procedure should be used for spade connectors.
6 AC POWER CONNECTOR
The AC input connector provides power to the unit with the
supplied power cord. The 120 VAC version of the RX-7 is supplied
with a 20 Amp power cord with a NEMA-5-20P plug on one end.
The 120 VAC version of the ZX-7 is supplied with a two 15 Amp
power cords with standard NEMA-5-15P plugs on one end. The
NEMA 5-20P power cord has a different prong configuration than
the average typical 15A household plug.
Use heavy gauge speaker cable to ensure low-impedance
connections between the amplifier and the speakers. Observe
correct speaker polarity.
2-8
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ZX-7/RX-7
Basic Operation
When installing the trigger cable, never have the
controlling source or amplifier powered on. Doing so will
cause the trigger device to work improperly and could
cause damage to both the source and amplifier.
POWER CONTROL CONNECTIONS
The ZX-7/RX-7 features a built-in remote power-on system that will
automatically switch the amplifier on when another device in the
system is switched on.
NOTE:
The trigger cable supplied has a 1/8” connector on both ends. In order for
this cable to be used with the MC-12HD or MC-8, you must modify the
cable. The cable has an insulated center conductor with a braided shield
surrounding it. These are protected by the outer black jacket. The inner
conductor is the positive (+) lead and the braided shield is the negative (-)
lead. Snip the connector off one end of the trigger cable and remove
about 3/4” of the outer black jacket. Be careful not to nick or cut the
braided shield strands. Carefully unweave the braided shield and twist the
loose strands into a tight group. Strip about 1/4” of the insulation off the
center conductor. Insert this into the (+) terminal of the powered source.
Insert the twisted group of shield braid wires into the (-) terminal of the
powered source. Fasten securely. You should also use an electrical meter if
possible.
REMOTE TRIGGER POWER ON
How to make connections for remote power-on using
components equipped with a DC trigger jack:
Using an accessory cable with a 1/8” mono mini-plug and the
correct connector specified for your source device, follow the
procedure below to connect the trigger-output jack on the rear of
the source device to the ZX-7/RX-7 rear panel TRIGGER INPUT.
To install the Trigger Cable:
•
•
Power the controlling source and amplifier off.
Connect the trigger cable to the controlling source and the
amplifier.
•
After the connections are made, power on the controlling
source and then the amplifier. After the source unit is fully
powered up, the LED on the amplifier should be in the ON
state, BLUE. If the amplifier is in the standby mode, RED, press
the standby/on button on the front panel until the amplifier is
in the ON state, BLUE.
•
•
Verify the trigger is working by putting the source unit into
standby mode. The amplifier after a short delay will also go into
the standby mode, RED LED.
Once you have verified that the trigger cable is working, only
use the source unit to power on and off your amplifier.
WARNING
2-9
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Basic Operation
Lexicon
REMOTE POWER ON WITH EXTERNAL AC TO DC
POWER CONVERTER
POWER CONNECTION SAFETY
After all audio and system connections have been made, connect
the power cord to an AC power source. Be sure that the ZX-7/RX-7
is powered off and that the device connected to the remote trigger
input is off when connecting the power cord and plugging it into
an AC outlet.
If your preamplifier, processor or receiver does not have a dedicated
trigger jack, it is still possible to activate the unit for automatic
power on when a switched outlet is available on the source device
rear panel. To control the ZX-7/RX-7 in this instance, a small AC to
DC power converter capable of delivering a 3.3V DC minimum to
24V DC maximum signal is required. The DC voltage should
terminate in a standard 1/8”mini-plug.
WARNING
How to make connections for remote power-on using external
AC to DC Power converter:
Do not plug the ZX-7/RX-7 directly into the “Switched
Accessory” outlet of another device! These outlets are
intended for use with low current draw products such as
tuners, CD players or cassette decks. These outlets are not
designed to handle the high current draw of a power
amplifier. Using these outlets for a power amplifier is a
significant safety hazard.
1. Plug the AC adapter into a switched outlet that will be activated
when you wish to have the amplifier power on. This may be the
switched outlet at the rear of another A/V product.
2. Connect the 1/8 mini-plug from the adapter to the ZX-7/RX-7
rear panel TRIGGER INPUT. The ZX-7/RX-7 will now turn on
and off automatically, depending on the status of the
controlling device.
SOURCE COMPONENT CONNECTIONS & OUTPUT
SETTINGS
Make all connections before powering on the ZX-7/RX-7. It is also
recommended that you power on the source components and
processor in your system before powering on the ZX-7/RX-7. This
avoids the possibility of any pops or transients from other
components being amplified and sent to the speakers. Always start
with a low volume level on the controller or preamplifier to avoid
potential damage to the speakers.
All volume and level adjustments are made on your preamplifier,
controller or surround processor. When using the ZX-7/RX-7 for the
first time, you should re-set the output levels of the channels on
your processor.
2-10
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ZX-7/RX-7
Basic Operation
PROTECTION MODE
The ZX-7/RX-7 is equipped to protect itself against potentially
damaging conditions such as overheating, mis-wiring and electrical
failures. Under such conditions, the ZX-7/RX-7 will enter a
protection mode. When this occurs, the unit will mute to protect
itself and speakers from potential damage.
If the ZX-7/RX-7 enters protection mode (mutes itself):
1. Immediately power off the unit with the rear panel master
power switches and disconnect all AC power cords.
2. Examine all speaker connections to ensure there are no shorts.
Power on the ZX-7/RX-7. If the unit remains in a muted state, contact
Lexicon customer service for assistance.
2-11
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Troubleshooting & Maintenance
Lexicon
5. Allow the amplifier to cool before powering it on again.
TROUBLESHOOTING
Audio sounds out-of-phase.
The amplifier does not power on.
Check to ensure proper speaker wiring.
1. Check the rear panel circuit breakers. Ensure breakers have not
been tripped.
Audio levels differ.
2. Attempt to power on the amplifier with the front panel
Check the settings on your preamp, processor or controller.
Standby button.
3. Make sure all rear panel power switches are set to the I (on)
position.
Audio plays, then cuts off.
Check speaker connections for short circuits at the amplifier and
speaker.
4. Examine the power cords to ensure a good connection
between the rear panel AC input connector and the wall outlet.
5. Check the wall outlet.
A humming sound is present in the audio.
The TRIGGER INPUT is connected to an external device, but the
amplifier does not power on and off with the external device.
Audible hum, or a discernible low frequency noise is one of the
most common problems within audio/video systems. This problem,
even when the volume is at a low level, is usually caused by a
common problem known as “ground loops.” A ground loop occurs
when there is a difference in ground voltages between two or more
components that are connected electrically.
1. Verify the trigger cable is connected at both ends and verify
that the trigger cable is connected to the right device. Also
re-verify the trigger installation instructions as instructed in
Section 2.
2. Verify the trigger level.
In most cases, one or more of the following suggestions below will
solve the hum problem.
One or more channels is not passing audio.
1. If a cable TV connection is present, disconnect the cable from
the wall outlet. If this eliminates the humming sound, a ground
loop isolation device is required. Contact your dealer or cable
provider for assistance.
1. Reduce system volume level.
2. Power the amplifier off.
2. Disconnect components one at a time to isolate the problem.
Once the problem is identified, make sure the associated
3. Check input connections.
4. Check speaker connections.
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Lexicon
component is properly grounded and connected to the same
Troubleshooting & Maintenance
MAINTENANCE
electrical ground as the ZX-7/RX-7.
Routine maintenance should be performed on a periodic basis.
Clean the exterior surfaces of the unit with a soft, dry, lint-free cloth.
Do not use alcohol, benzene, acetone-based cleaners, or strong
commercial cleaners. Do not use a cloth made with steel wool or
metal polish. If the unit is exposed to a dusty environment, a
low-pressure blower may be used to remove dust from its exterior.
3. Turn off all components within your system, and then
disconnect the input cable on the amplifier. Turn the amplifier
back on. If the hum disappears the fault may be with the input
cable that is being used. Make sure the cables are properly
shielded or use a cable that has better shielding. Make sure the
cable is not running or laying on top of any AC power cords.
4. Ground loop problems may also be caused by poor grounding
of the electrical system within your home or may be caused by
faulty earth grounds in your home’s electrical system. To isolate
the problem, try unplugging components with three prong
grounded power cords one at a time to see if one or all are
causing the problem.
In the past, cold water pipes and other utilities were often used
for grounds. These items may not be still valid because of
corrosion of the existing pipes and the installation and use of
PVC piping. Please check with a licensed electrician for further
evaluation.
If all else fails. . .
1. Contact an authorized Lexicon dealer.
2. Contact Lexicon Customer Service at 781-280-0300
additional troubleshooting information.
Note:
frequently asked questions and additional troubleshooting information.
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Appendix
Lexicon
SPECIFICATIONS
RX-7 Performance
Output Power
Power Requirements
Frequency Response
THD
200W RMS per channel into 8 ohms from 20 Hz - 20 kHz
120 VAC 14A 60 Hz / 230 VAC 6A 50/60 Hz
20 Hz to 20 kHz +0.1 / -0.2 dB
Specifications are subject to change without notice.
Audio Input Connectors
Less than 0.05% at full rated FTC power 20 Hz - 20k Hz
Less than 0.005% at full FTC power at 1 kHz
ZX-7 / RX-7
7 RCA, 7 XLR
Signal-to-Noise Ratio Greater than -105 dB below rated full rated power
A-Weighted
IM Distortion
Crosstalk
Less than .03% at full rated power
Greater than -80 dB @ 1 KHz (30 kHz bandwidth)
Greater than 200 @ 20 Hz (ref 8 Ohms)
1.6 volts for 200W out into 8 Ohms
Minimum 10K Ohms
Audio Output Connectors
ZX-7 / RX-7
7 pairs of gold-plated binding posts
Damping Factor
Input Sensitivity
Input Impedance
Gain
ZX-7 Performance
28 dB 0.5 dB
Output Power
300W RMS per channel into 8 Ohms from 20 Hz -20 kHz
Power Requirements
Two circuits each rated 120 VAC 12A or one circuit rated
230 VAC 8A 50/60 Hz
Other
Frequency Response
THD
20Hz to 20 kHz +0.1dB / -0.2 dB
Trigger Input
Weight
3.3V minimum- 24V maximum DC
Less than 0.05% at full rated FTC power 20 Hz - 20 kHz
Less than 0.005% at full FTC power at 1 kHz
ZX-7: 145 lbs (65.2 kg)
RX-7: 105 lbs (47.2 kg)
Signal-to-Noise Ratio
Greater than -110 dB below rated full rated power
A-Weighted
Rack Mounting
Height
Optional brackets are available for mounting either ampli-
fier in standard 19-inch equipment rack.
IM Distortion
Crosstalk
Less then 0.03% at full rated power
Greater than -80 dB @ 1 KHz (30k Hz bandwidth)
Greater than 200 @ 20 Hz (ref 8 Ohms)
2 volts for 300W out into 8 Ohms
Minimum 10K Ohms
ZX-7 9.7 inches (246mm) (with feet)
ZX-7 8.7 inches (221mm) (without feet)
RX-7 7.95 inches (202mm) (with feet)
RX-7 6.95 inches (177mm) (without feet)
Damping Factor
Input Sensitivity
Input Impedance
Gain
Width
Depth
ZX-7 and RX-7 17.3 inches (439mm)
ZX-7 20.3 inches (516mm) (Overall with Handles)
RX-7 18.5 inches (470mm) (Overall with Handles)
28 dB 0.5 dB
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ZX-7/RX-7
Appendix
DECLARATION OF CONFORMITY
Application of Council Directive(s):
2004/108/EEC and 73/23/EEC as amended by 93/68/EEC
Standard(s) to Which Conformity is Declared:
EN55013:2001 + A1:2003,
EN55020:2002 + A1:2003 + A2:2005,
EN61000-3-3:1995 + A1:2001,
EN60065:2002
Manufacturer:
Harman Specialty Group
3 Oak Park Drive
Bedford, MA 01730-1413 USA
The equipment identified here conforms to the Directive(s)
and Standard(s) specified above.
Type of Equipment: Power Amplifier
Model:
Date:
Lexicon ZX-7 and RX-7
March 2007
Harman Specialty Group
Vice President of Engineering
3 Oak Park Drive
Bedford, MA 01730-1413 USA
Tel: 781-280-0300
Fax: 781-280-0490
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A Harman International Company
#6
Part No. 070-18130 | Rev 0
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