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Getting Started

Lexicon

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ABOUT THE LX POWER AMPLIFIERS

Thank you for purchasing an LX Power Amplifier, a reference-qual-
ity amplifier designed to meet the highest standards of power and
performance under even the most extreme operating conditions.
Equipped with advanced thermal, DC, and speaker protection, the
LX amplifiers deliver reliable and exceptional performance with
most loudspeakers, including mismatched, reactive, and unusual
loads. In addition, the LX amplifiers include protection against
short circuits, component failures, miswiring, and internal faults.

Available in five or seven channel versions, the LX amplifiers
deliver high-power performance. Each 200-Watt channel includes
four custom-designed, hand-graded output transistors as well as a
160-volt power supply for extra headroom. Bridgeable architecture
allows the first four 200-Watt channels to be configured with up to
two 400-Watt channels for even higher-power output. Non-
bridged channels are compatible with speaker impedances of 2

and above, and bridged channels are compatible with speaker
impedances of 4

and above.

Complemented by the heavy-duty, gold-plated speaker output
connectors, the rear panel includes selectable balanced or unbal-
anced audio input on RCA and XLR or 1/4-inch Tip/Ring/Sleeve
connectors. A trigger input connector allows the LX amplifiers to
be controlled with associated components such as the MC-12 or
MC-8 Digital Controller. In addition, a ground lift switch can be
used to eliminate audible hum caused from multiple grounding
paths.

The LX amplifiers feature a Junction Temperature Simulation (JTS)
computer that predicts the internal temperature of each output
transistor to prevent overheating. Unlike similar technologies, JTS
combines the output voltage and current of each output transistor

with heatsink temperatures to arrive at an accurate internal tem-
perature prediction. As a result, JTS prevents overheating even
when heatsink temperatures are relatively cool, allowing the LX
amplifiers to achieve maximum performance and reliability from
the output transistors.

In addition to JTS, the LX amplifiers include advanced thermal and
DC protection for each channel. Thermal protection automatically
deactivates channels exceeding 115°C, while DC protection pre-
vents DC and frequencies below 10Hz from reaching the speakers.
Dedicated, multi-colored channel status LEDs are located on the
front panel to provide at-a-glance viewing of channel status at all
times.

With THX Ultra Certification, the LX amplifiers are certified to meet
the highest THX standards. Advanced thermal, DC, and speaker
protection further guarantee an exceptional performance under
even the most extreme operating conditions. Add to this incredible
power and wide-ranging flexibility, and the LX amplifiers are at
home in the most sophisticated and demanding home theaters.

Summary of Contents for LX - REV 3

Page 1: ...LX Power Amplifier User Guide...

Page 2: ...nched 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 bra...

Page 3: ...ocedure 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...

Page 4: ...ection 1 Getting Started About the LX 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...

Page 5: ...condensando los materiales para las se ales de da o Informe cualquier da o en seguida al portador el funcionamiento defectuoso de equipo de informe a su distribuidor D BALLER ET INSPECTI N Apr s avoi...

Page 6: ...1 Getting Started About the LX Power Amplifiers 1 2 Highlights Product Registration 1 3 Installation Considerations 1 3...

Page 7: ...LX amplifiers to be controlled with associated components such as the MC 12 or MC 8 Digital Controller In addition a ground lift switch can be used to eliminate audible hum caused from multiple groun...

Page 8: ...hannel Bridgeable architecture for higher power output 400W at 8 Oversized toroidal power transformer with extraordinarily low DC resistance and thermal protection High power supply voltage 160V for e...

Page 9: ...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...

Page 10: ...deactivates the LX amplifier When the unit is in standby pressing the standby button deactivates standby mode and activates the LX amplifier The red standby button LED will flash for approximately fiv...

Page 11: ...rmal Operation Constant Bright Blue 1 distortion in the audio signal Reduce vol ume level to help eliminate potentially damaging audio signals from reaching the speakers Flashing Red The temperature o...

Page 12: ...s shown on page 2 6 The rear panels are similar except the LX 7 amplifier includes two additional channels 1 8 9 3 6 4 5 2 7 External wiring connected to connectors marked with the triangle pictured a...

Page 13: ...ed voltage may cause the amplifier to enter a protection mode indicated by the red standby LED flashing 3 INPUT 1 to 7 LX 7 or 1 to 5 LX 5 Provide audio input for the speakers connected to the corresp...

Page 14: ...7 rear panel is shown on page 2 4 Both are similar except the LX 7 features two additional channels 1 8 9 3 6 4 5 2 7 External wiring connected to connectors marked with the triangle pictured at the...

Page 15: ...the audio inputs are grounded to the chassis This switch should be set to ON whenever there is ground noise present in the system 8 TRIGGER INPUT Enables the amplifier to be controlled by the MC 12 M...

Page 16: ...ansistor reaches its maximum allowable temperature it is instantly restrict ed until the temperature decreases JTS s dynamic nature enables it to avoid the problems inherent in competing products that...

Page 17: ...the corresponding front panel channel status LED will no longer be lit After approximately 4 seconds DC protection will be automatically deactivated The relay will close and the corresponding channel...

Page 18: ...3 Troubleshooting Maintenance Troubleshooting 3 2 Maintenance 3 3...

Page 19: ...wer switch is set to on 2 Make certain the rear panel TRIGGER INPUT switch is set to OFF One or more channels is not passing audio but the corresponding channel status LED is lit blue 1 Make sure the...

Page 20: ...xicon com for answers to frequently asked questions and additional troubleshooting information MAINTENANCE The following routine maintenance should be performed on a periodic basis Clean the exterior...

Page 21: ...A Appendix Specifications A 2 Declaration of Conformity A 4...

Page 22: ...ormance Minimum 2 INDIVIDUAL Mode Speaker 4 BRIDGED Mode Impedance Performance Continued Frequency 20Hz to 20kHz 0 1dB Response 10Hz to 100kHz 0 5 3dB THD Below 0 02 at 200W 8 all channels driven 20Hz...

Page 23: ...s A 3 Other Continued Weight LX 7 LX 5 56lbs 25 4kg 52lbs 23 6kg Rack Mounting Optional brackets are available for mounting either amplifier in stan dard 9 inch equipment rack Specifications are subje...

Page 24: ...d EN 60065 1998 Manufacturer Lexicon Inc 3 Oak Park Bedford MA 01730 1441 USA The equipment identified here conforms to the Directive s and Standard s specified above Type of Equipment LX 5 and LX 7 P...

Page 25: ...to 1 3 Maintenance 3 3 Male Cable End XLR 2 5 Illustration MODE Switch 2 5 2 7 3 2 OUTPUTs 2 4 2 5 2 6 2 7 2 8 2 9 Power Outage 3 3 Power Switch 2 5 3 2 Product Registration 1 3 Protection Modes 2 8...

Page 26: ...on about where the unit should be taken or sent When making a written request please include your name complete address and daytime telephone number the product model and serial numbers and a descript...

Page 27: ...nc 3 Oak Park Bedford MA 01730 1413 USA Tel 781 280 0300 Fax 781 280 0490 www lexicon com Customer Support Tel 781 280 0300 Fax 781 280 0495 Sales Fax 781 280 0499 Service Lexicon Part No 070 14876 Re...

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