Lexicon RX-7 User Manual
ZX-7 / RX-7 Power Amplifier
User Guide
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
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.
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 groundingtype 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.
10. Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles, and the point where they exit from the
apparatus.
11. Main Plug is considered to be the disconnect
device for this product and shall remain readily
operable.
To reduce the risk of fire or electric
WARNING
shock, do not expose this apparatus to
rain or moisture. Do not place objects
containing liquid, such as vases, on this
apparatus.
12. Only use attachments/accessories specified by the
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.
14. Unplug this apparatus during lightning storms or
when unused for long periods of time.
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.
• 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.
• Do not install the unit in an unventilated rack,
or directly above heat-producing equipment
such as power amplifiers. Observe the
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.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
maximum ambient operating temperature
listed in the product specification.
• Never attach audio power amplifier outputs
directly to any of the unit’s connectors.
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 interference 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 encouraged to try to correct the interference by one or more
of the following measures:
• 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.
• Consult the dealer or an experienced electronic
technician for help.
This triangle, which appears on your component,
alerts you to important operating and
maintenance instructions in this
accompanying literature.
Lexicon Inc.
3 Oak Park Drive
Bedford, MA 01730-1413 USA
Tel 781-280-0300
Fax 781-280-0490
www.hsgav.com
Customer Service
Telephone: 781-280-0300
Fax: 781-280-0499
email: csupport@hsgav.com
Part No. 070-18130 | Rev 0 | 03/07
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.
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 enclosu
sufficient to constitute a risk of shock.
Appears on the component to indicate
important operating and maintenance
instuctions in the accompanying literature.
re – voltage that may be
WARNING
CAUTION!
Note:
ii
Calls attention to a procedure, practice,
condition or the like that, if not correctly
performed or adhered to, could result in injury
or death.
Calls attention to a procedure, practice,
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.
Calls attention to information that is essential to
highlight.
ZX-7 / RX-7 Introduction
Table of Contents
Getting Started
About The ZX-7 and RX-7 ......................................................... 1-2
Product Registration ..................................................................1-2
Highlights ................................................................................. 1-3
Installation Considerations.........................................................1-3
Basic Operation
Front-Panel Overview ................................................................ 2-2
Standby Button ..................................................................... 2-3
Rear-Panel ZX-7 230 VAC Overview ..........................................2-4
Rear-Panel ZX-7 120 VAC Overview ..........................................2-5
Rear-Panel RX-7 Overview .........................................................2-6
Power Control Connections.......................................................2-9
Remote Trigger Power On ..................................................... 2-9
Remote Power On with External AC to DC Power Converter 2-10
Power Connection Safety .................................................... 2-10
Source Component Connections & Output Settings ........... 2-10
Protection Mode .....................................................................2-11
Troubleshooting & Maintenance
Troubleshooting........................................................................ 3-2
Maintenance .............................................................................3-3
Appendix
Specifications ............................................................................ A-2
Declaration of Conformity .........................................................A-3
iii
1
Getting Started
About The ZX-7 and RX-7 .......................................................... 1-2
Product Registration................................................................... 1-2
Highlights .................................................................................. 1-3
Installation Considerations.......................................................... 1-3
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.
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 lowfrequency reproduction and ample power reserves.
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
Please register your new amplifier within 15 days of purchase.
Register online at www.harmanspecialtygroup.com/registration or
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
ZX-7/RX-7 Getting Started
HIGHLIGHTS
• ZX-7: 300 Watts per channel @ 8 Ohms
RX-7: 200 Watts per channel @ 8 Ohms
• Dual oversized toroidal power transformers with extraordinarily
low DC resistance and thermal protection
• High-power supply voltage for extra headroom at the outputs
• Stable with mismatched, reactive, or unusual loads
• Thermal protection against overheating
• Speaker protection against DC and frequencies below 10Hz
• Protection against short circuits, device failures, mis-wiring, and
internal faults
• Trigger input for power control from an external device
• RCA and XLR inputs
• Gold plated input and output connectors
• Rack-mount option available
• Noise elimination
• Delayed audio turn-on to eliminate noises from driving equipment
• Completely symmetrical circuit design which ensures optimal
audio sonality
• Hefty power supplies with lots of filter capacity ensures rock-solid
bass
• High damping factor (no output relays) ensure realistic, impressive
bass transients
• Advanced protection circuitry ensures reliability under any sort of
user abuse
INSTALLATION CONSIDERATIONS
To ensure optimal performance, pay particular attention to the
instructions below and to other precautions that appear
throughout this user guide.
DO be careful when moving the amplifier, as it is very heavy.
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.
DO select a dry, well-ventilated location out of direct sunlight.
DO NOT install the ZX-7/RX-7 on a surface that is unstable or
unable to support all four feet.
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.
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.
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.
DO NOT place the ZX-7/RX-7 on a windowsill or any location
exposed to direct sunlight.
DO NOT stack the ZX-7/RX-7 directly above heat-producing
equipment such as another power amplifier.
1-3
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