Lexicon LX-5, LX-7 User Manual

User Guide

IMPORTANT SAFETY INSTRUCTIONS

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

This triangle, which appears on your component,

alerts you to important operating and

maintenance instructions in this

accompanying literature.

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 other apparatuses that produce 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 grounding-type
plug has two blades and a third grounding prong. The wide blade or the third prong is 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) Only use attachments/accessories specified by the manufacturer.

12) Use only with a cart, stand, 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.

13) Unplug this apparatus during lightning storms or when unused for long periods of time.

14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as 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.

15) To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.

A Harman International Company

Manufactured under license from Lucasfilm, Ltd. U.S. patent numbers 5,043,970; 5,189,703; and 5,222,059. Foreign patents pending. “Lucasfilm” and “THX” are
registered trademarks of Lucasfilm, Ltd.

© 2001 Lexicon, Inc. All rights reserved.

This document should not be construed as a commitment on the part of Lexicon, Inc. The information it contains is subject to change without notice. Lexicon, Inc. assumes
no responsibility for errors that may appear within this document.

133792-1

Lexicon, Inc.
3 Oak Park
Bedford, MA 01730-1441 USA
Tel [phone]
Fax [phone]
www.lexicon.com

Customer Support

Tel [phone]
Fax [phone] (Sales)
Fax [phone] (Service)

Lexicon Part No. 070-14876 | Rev 0 | 09/01

Introduction

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Lexicon

Introduction

Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . .viii

Desempacotando e Inspeção . . . . . . . . . . . . . . . . . . .viii

Auspackend und Inspektion . . . . . . . . . . . . . . . . . . . .viii

Desempaquetando e Inspección . . . . . . . . . . . . . . . . .viii

Déballer et Inspectión . . . . . . . . . . . . . . . . . . . . . . . .viii

Spacchettando ed Ispezione . . . . . . . . . . . . . . . . . . . .viii

Section 1: Getting Started

About the LX Power Amplifiers . . . . . . . . . . . . . . . . . . . . . . . 1-2

Highlights

Using the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

User Guide Symbols

Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Location Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Section 2: Basic Operation

Front Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Rear Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Protection Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Thermal Protection • DC Protection

Section 3: Troubleshooting and Maintenance

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3-3

Appendix

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Index

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LX Power Amplifiers

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Introduction

UNPACKING AND INSPECTION

After unpacking the unit, save all packing materials in case the unit
ever needs to be shipped. Thoroughly inspect the modules and
packing materials for signs of damage. Report any damage
to the carrier at once; report equipment malfunction to the
dealer.

DESEMPACOTANDO E INSPEÇÃO

Depois de desempacotar a unidade, economiza todos os materiais
de embalagem no caso de você já precisa transportar a unidade.
Completamente inspecione os módulos e empacotando materiais
para sinais de dano. Informe qualquer dano imediatamente ao
portador; mau funcionamento de equipamento de relatório para
seu negociante.

AUSPACKEND UND INSPEKTION

Nach dem Auspacken der Einheit, außer allen Verpackung
Materialien, falls Sie die Einheit je verschicken müssen. Inspizieren
Sie die Bauelemente und packende Materialien gründlich für
Zeichen von Schaden. Berichten Sie sofort irgendeinen Schaden
zum Boten; Bericht-Ausrüstung-Funktionsstörung zu Ihrem
Händler.

DESEMPAQUETANDO E INSPECCIÓN

Después de desempaquetar la unidad, ahorra todos los materiales
del embalaje en caso de que usted alguna vez necesita enviar la
unidad. Completamente inspeccione los módulos y condensando
los materiales para las señales de daño. Informe cualquier daño en
seguida al portador; el funcionamiento defectuoso de equipo de
informe a su distribuidor.

DÉBALLER ET INSPECTIÓN

Après avoir déballé l'unité, sauve toutes les matières de l'emballage
au cas où vous avez besoin jamais de transporter l'unité.
Entièrement inspectez les modules et emballer des matières pour
signes de dégât. Rapportez tout dégât au porteur à la fois;
fonctionnement défectueux du matériel du rapport à votre
revendeur.

SPACCHETTANDO ED ISPEZIONE

Dopo avere spacchettato l'unità, mai salvi tutti i materiali di
imballaggio in caso che Lei ha bisogno di inviare l'unità.
Completamente ispezioni i moduli e comprimendo materiali per
segnali di danno. Subito riporti alcun danno al corriere;
malfunzionamento di attrezzatura di rapporto al Suo rivenditore.

iii

1

Getting Started

About the LX Power Amplifiers .....................................................1-2

Highlights

Using the Documentation.............................................................1-3

User Guide Symbols

Product Registration......................................................................1-3

Location Considerations................................................................1-3

Getting Started

Lexicon

ABOUT THE LX POWER AMPLIFIERS

Thank you for purchasing an LX Power Amplifier. The LX amplifiers
are designed to meet the highest standards of performance and
sound quality. In addition, THX Ultra Certification ensures that the
amplifiers meet the highest standards set forth by Lucasfilm’s Home
THX division.

The LX amplifiers include many unique technologies that allow
them to deliver exceptional performance, even under extreme
operating conditions. The amplifiers feature Junction Temperature
Simulation (JTS) advanced thermal protection. An internal JTS
computer predicts internal temperatures and protects output
transistors from overheating, allowing the amplifiers to achieve
maximum performance with a minimum number of output
transistors. This design enhances performance and reliability.

In addition to JTS, the LX amplifiers feature thermal protection for
each channel and the main power transformer. The amplifiers also
provide DC protection for each channel, preventing DC and
frequencies below 10Hz from reaching the speakers.

The LX amplifiers offer high-power output that can be configured
for almost any system. The LX-7 has seven 200W channels, and the
LX-5 has five 200W channels. Both amplifiers can be bridged to
provide as many as two 400W channels, in addition to the
remaining 200W channels. Heavy-duty speaker outputs and
selectable balanced or unbalanced audio inputs are also available.

A rear panel TRIGGER INPUT allows the LX amplifiers to be
powered on and off by external devices. A GROUND LIFT switch
helps eliminate audible hum caused by multiple grounding paths
in the system.

Built to Lexicon standards, the LX Power Amplifiers establish a new
benchmark for home theater amplifiers. An unbeatable
combination of sound quality, power, flexibility, and reliability
makes these amplifiers at home in virtually any system.

HIGHLIGHTS

• 200W per channel

• Four custom designed, hand-graded output transistors per
channel

• Bridgeable architecture for higher power output (400W at 8Ω)

• Oversized toroidal power transformer with extraordinarily low
DC resistance and thermal protection

• High-power supply voltage (160V) for extra headroom at the
outputs

• THX Ultra Certification

• Junction Temperature Simulation (JTS) to provide maximum
performance from output transistors

• Thermal protection against overheating

• Speaker protection against DC and frequencies below 10Hz

• Protection against short circuits, device failures, miswiring, and
internal faults

• Stable with mismatched, reactive, or unusual loads

• Quiet, microprocessor controlled, forced-air cooling to
minimize chassis size

• Compatible with 2Ω speaker impedances (INDIVIDUAL Mode)

• Trigger input for power control from an external device

• RCA, XLR, and 1/4-inch Tip/Ring/Sleeve inputs

• Ground lift switch

• Heavy-duty gold plated outputs

• Multi-color channel status LEDs

• Rack-mount option available

1-2

LX Power Amplifiers

Getting Started

USING THE DOCUMENTATION

Refer to this documentation for assistance with installation and
operation of the amplifier. Read all instructions and safety
precautions.

USER GUIDE SYMBOLS

The following symbols appear throughout this user guide:

WARNING

CAUTION

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 to or destruction of part or all of the
product.

Note: Calls attention to information that is essential

to highlight.

LOCATION CONSIDERATIONS

The LX Power Amplifiers require care during installation to ensure
optimal performance. The amplifiers should be installed in an
equipment rack using an optional rack-mount kit available from
Lexicon dealers or www.lexicon.com. Leave at least 2 inches of
open space around the top, sides, and rear of the amplifier for
proper ventilation.

CAUTION

• Be careful when moving the LX Power
Amplifers, which are quite heavy.

• Do not obstruct the ventilation holes in
the chassis.

PRODUCT REGISTRATION

This LX Power Amplifier can be registered by returning the Product
Registration card attached to the back cover of this user guide or
by visiting www.lexicon.com. Please also retain the bill of sale,
which represents proof of purchase and warranty.

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