Lexicon CX-5, CX-7, CX User Manual
LX
Power Amplifier
User Guide
CX
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) In CE countries, this amplifier is considered “professional equipment.” In order to comply with CE requirements, the customer is required to obtain permission from the local supply authority
before connecting this equipment.
8) Do not block any ventilation openings.Install in accordance with the manufacturer’s instructions.
9) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatuses that produce heat.
10) 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.
11) Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
12) Only use attachments/accessories specified by the manufacturer.
13) 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 car t/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 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.
16) To reduce the r isk of fire or electric shock, do not expose this apparatus to rain or moisture.
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.
DOCUMENTATION CONVENTIONS
This document contains general safety, installation, and operating instructions for the CX-7 and CX-5 Power Amplifiers.It is important to
read this user guide before attempting to use these products.Pay particular attention to safety instructions.
The following symbols are used in this 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.
Calls attention to a procedure, practice, condition or the like that, if not correctly perf ormed or adhered to, could result
in injury or death.
Calls attention to a procedure, practice, condition or the like that, if not correctly perf ormed 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.
Manufactured under license from THX, Ltd.“THX” and “Ultra2”are trademarks or registered trademarks of THX, Ltd.
“Lexicon”and the Lexicon logo are registered trademarks of Harman International Industries. U.S.patent numbers and other worldwide patents issued and pending.
© 2003 Harman Specialty Group. 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.
3 Oak Park
Bedford, MA 01730-1413 USA
Tel 781-280-0300
Fax 781-280-0490
www.harmanspecialtygroup.com
Customer Support
Tel 781-280-0300
Fax 781-280-0495 (Sales)
Fax 781-280-0499 (Service)
Part No.070-15879 | Rev 0 | 07/03
CAUTION
WARNING
ii
Introduction
Lexicon
Introduction
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . .iii
Auspackend und Inspektion . . . . . . . . . . . . . . . . . . . . .iii
Desempaquetando e Inspección . . . . . . . . . . . . . . . . . .iii
Déballer et Inspectión . . . . . . . . . . . . . . . . . . . . . . . . .iii
Spacchettando ed Ispezione . . . . . . . . . . . . . . . . . . . . .iii
Desempacotando e Inspeção . . . . . . . . . . . . . . . . . . . .iii
Section 1: Getting Started
About the CX Power Amplifiers . . . . . . . . . . . . . . . . . . . . . . . 1-2
Highlights
Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Section 2: Basic Operation
Front Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Rear Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Protection Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Thermal Protection • Current Protection • DC Protection
Section 3: Troubleshooting and Maintenance
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Appendix
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Index
FR
IT
PT
ES
DE
US
iii
Introduction
CX Power Amplifiers
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.
AUSPACKEND UND INSPEKTION
Überprüfen Sie die Verpackung auf Beschädigung. Nehmen Sie das
Gerät aus der Verpackung. Heben Sie das gesamte
Verpackungsmaterial auf, falls das Gerät einmal verschickt werden
muss. Überprüfen Sie alle Bestandteile auf Beschädigung.
Verständigen Sie sofort den Spediteur, falls die Verpackung
und/oder die Bestandteile der Lieferung beschädigt sind.
Verständigen Sie sofort Ihren Händler, falls das Gerät nicht richtig
funktioniert.
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.
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.
USDEES
FR
IT
PT
1
Getting Started
About the CX Power Amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Highlights
Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Getting Started
Lexicon
1-2
ABOUT THE CX POWER AMPLIFIERS
Thank you for purchasing a CX Power Amplifier, a reference-quality amplifier, which is based on the award-winning LX amplifier and
is designed to meet the highest standards of power and performance under even the most extreme operating conditions. Equipped
with advanced thermal, current, DC, and speaker protection, the
CX amplifiers deliver reliable and exceptional performance with
most loudspeakers, including mismatched, reactive, and unusual
loads. In addition, the CX amplifiers include protection against
short circuits, component failures, miswiring, and internal faults.
Available in seven or five channel versions, the CX amplifiers
deliver high-power performance. Each 140-Watt channel includes
four custom-designed, hand-graded output transistors All channels are capable of driving speaker impedances of 2Ω and above.
Complemented by gold-plated speaker output connectors, the rear
panel includes selectable balanced or unbalanced audio input via
RCA and XLR connectors. A trigger input connector allows the CX
amplifiers to be controlled with associated components such as the
MC-12 or MC-8 Digital Controller. In addition, a ground lift switch
for each channel can be used to eliminate audible hum caused by
multiple grounding paths.
The CX amplifiers include advanced thermal, current, and DC
protection for each channel. Thermal protection monitors the
temperature of the chassis and heatsinks and automatically deactivates the specific channel(s) when they exceed their normal safe
operating temperature. Current protection ensures that the
output transistors are protected by limiting the current capability
which is determined by the output voltage, while DC protection
prevents DC and frequencies below 10Hz from reaching the speakers. Dedicated channel status LEDs are located on the front panel
to provide at-a-glance viewing of channel status at all times.
With THX Ultra2 Certification, the CX amplifiers are certified to
meet the highest THX standards. Advanced thermal, current, DC,
and speaker protection further guarantee exceptional performance
under even the most extreme operating conditions. Add to this
incredible power and wide-ranging flexibility, and the CX amplifiers are at home in the most sophisticated and demanding home
theaters.
PRODUCT REGISTRATION
Please register the CX Power Amplifier within 15 days of purchase.
To do so, register online at www.harmanspecialtygroup.com or
complete and return the product registration card attached to the
back cover of this user guide. The product registration card serves
no warranty purposes. Retain the sales receipt as proof of warranty
coverage.
INSTALLATION CONSIDERATIONS
The CX Power Amplifiers require special care during installation to
ensure optimal performance. Leave at least 2 inches of open space
around the top, sides, and rear of the amplifier for proper ventilation. If the amplifier is installed in an equipment rack, an optional
rack-mount kit is available from Lexicon dealers or at
www.harmanspecialtygroup.com.
Getting Started
CX Power Amplifiers
1-3
HIGHLIGHTS
• 140 Watts per channel
• Four custom designed, hand-graded output transistors per
channel
• Oversized toroidal power transformer 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
• Compatible with 2Ω speaker impedances
• THX Ultra2 Certification
• Thermal protection against overheating
• Speaker protection against DC and frequencies below 10Hz
•Protection against short circuits, device failures, miswiring, and
internal faults
•Trigger input for power control from an external device
• RCA and XLR inputs
• GROUND LIFT switch per channel
• Gold plated input and output connectors
• Rack-mount option available
•Be careful when moving the CX Power Amplifiers,
which are quite heavy.
• Do not obstruct the ventilation holes in the chassis.
CAUTION
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