LX 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.
DOCUMENTATION CONVENTIONS This document contains general safety, installation, and operating instructions for the LX-5 and LX-7 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. Lexicon, Inc.
Introduction Introduction Lexicon Section 1: Getting Started About the LX Power Amplifiers . . . . . . . . . . . . . . . . . . . . . . . 1-2 Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . .iii Auspackend und Inspektion . . . . . . . . . . . . . . . . . . . . .iii Desempaquetando e Inspección . . . . . . . . . . . . . . . . . .iii Déballer et Inspectión . . . . . . . . . . . . . . . . . . . . . . . . .iii Highlights Product Registration . . . . . . . . . . . . . . . . . . . . . . . .
Introduction LX 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. 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.
1 Getting Started About the LX Power Amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Highlights Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started ABOUT THE LX POWER AMPLIFIERS Thank you for purchasing an LX Power Amplifier, a reference-quality 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.
Getting Started LX Power Amplifiers HIGHLIGHTS PRODUCT REGISTRATION • 200W per channel • Four custom designed, hand-graded output transistors per channel • Bridgeable architecture for higher-power output (400W at 8Ω) Please register the LX Power Amplifier within 15 days of purchase. To do so, register online at www.lexicon.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.
2 Basic Operation Front Panel Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Rear Panel Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 Protection Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Operation Lexicon FRONT PANEL OVERVIEW 1 1. Standby Button Activates and deactivates standby mode when the LX amplifier is powered on with the rear panel power switch. The standby button performs no function when the LX amplifier is powered off with the rear panel power switch. When the unit is on, pressing the standby button activates standby mode and deactivates the LX amplifier. When the unit is in standby, pressing the standby button deactivates standby mode and activates the LX amplifier.
Basic Operation LX Power Amplifiers 1 2 2. Channel Status LEDs Provide at-a-glance view of the status of each channel as indicated in the table below: Color Constant Blue Constant Bright Blue Flashing Red Color Constant Red Status Status (Continued) A fault in the channel. Refer to Section 3 for troubleshooting information. Normal Operation ≤1% distortion in the audio signal. Reduce volume level to help eliminate potentially damaging audio signals from reaching the speakers.
Basic Operation Lexicon REAR PANEL OVERVIEW 6 9 8 3 4 5 The LX-7 rear panel is shown above. The LX-5 rear panel is shown on page 2-6. The rear panels are similar, except the LX-7 amplifier includes two additional channels. WARNING External wiring connected to connectors marked with the triangle pictured at the left requires installation by an instructed person or the use of ready-made leads or cords.
Basic Operation LX Power Amplifiers 1. Power Switch 4. OUTPUT 1 to 7 (LX-7) or 1 to 5 (LX-5) Disconnects power to the AC Input Connector. Set this switch to off when making or breaking connections to the amplifier, or when changing the setting of the MODE switch. 2. AC Input Connector The AC input connector provides power to the unit with the supplied power cord (3 conductor, 14AWG). Do not use an extension cord.
Basic Operation Lexicon REAR PANEL OVERVIEW (continued) 6 9 8 3 4 5 The LX-5 rear panel is shown above. The LX-7 rear panel is shown on page 2-4. Both are similar, except the LX-7 features two additional channels. WARNING External wiring connected to connectors marked with the triangle pictured at the left requires installation by an instructed person or the use of ready-made leads or cords.
Basic Operation LX Power Amplifiers 5. MODE Switch (continued from page 2-5) Make sure the amplifier is powered off when the MODE switch setting is changed. INPUTs and OUTPUTs used in (BRIDGED) mode are labelled in parenthesis. Do not use other INPUTs and OUTPUTs that are not labelled in parenthesis. Connect the positive speaker lead to the positive (red) OUTPUT of the first channel, and connect the negative speaker lead to the positive (red) OUTPUT of the second channel. 6.
Basic Operation COOLING SYSTEM The LX Power Amplifiers use temperature-controlled fans to exhaust heat. Heatsink temperatures are measured hundreds of times each second. Under most conditions, the fans are set to a slow speed. When the temperature climbs above 85˚C, the fans are set to a medium speed. When the temperature climbs above 100˚C, the fans are set to a high speed.
LX Power Amplifiers Basic Operation DC PROTECTION Each channel includes DC protection to prevent DC and frequencies below 10Hz from reaching the speakers. If this protection activates, the output relay will open and 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 status LED will light blue.
3 Troubleshooting & Maintenance Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting & Maintenance Lexicon TROUBLESHOOTING No front panel LEDs are lit. 1. Make sure the unit is plugged in and the rear panel power switch is set to on. The Standby LED is flashing rapidly. 1. Power the amplifier off. Allow the amplifier to cool before powering it on again. 2. Check the incoming line voltage. It should not be more than 10% below the mains supply voltage indicated in the Specifications (page A-2).
LX Power Amplifiers Troubleshooting & Maintenance The amplifier and other electrical devices in the listening room suddenly lose power. 1. Reset the circuit breakers for the affected device(s). If all else fails . . . 1. Contact an authorized Lexicon dealer. 2. Contact Lexicon customer service. Note: Visit www.lexicon.com for answers to frequently asked questions and additional troubleshooting information.
A Appendix Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix Lexicon SPECIFICATIONS Audio Input Connectors Performance (Continued) LX-7 Signal-to-Noise Ratio LX-5 • 7 RCA, 7 XLR (including 1/4-inch Tip/Ring/Sleeve) • 111dB 22kHz bandwidth, balanced inputs • 5 RCA, 5 XLR (including 1/4-inch Tip/Ring/Sleeve) • 109dB Audio Output Connectors LX-7 • 7 pairs of heavy-duty binding posts LX-5 • 5 pairs of heavy-duty binding posts Performance Amplifier performance specifications are identical in INDIVIDUAL and (BRIDGED) Modes, with the exception of Out
LX Power Amplifiers Appendix Other (Continued) Weight LX-7 LX-5 Rack Mounting • 56lbs (25.4kg) • 52lbs (23.
Appendix Lexicon DECLARATION OF CONFORMITY Application of Council Directive(s): 89/336/EEC and 93/68/EEC Standard(s) to which Conformity is Declared: EN 55103-1:1995, EN 61000-3-3:1995, EN 55022:1992 (Class B), EN 55103-2:1996, and 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.
I Index (BRIDGED) Mode . . . . . . . . . . . . . . . . . . . . . .2-5, 2-7 AC Input Connector . . . . . . . . . . . . . . . . . . . . . . .2-5 AC Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7 BAL/UNBAL Switch . . . . . . . . . . . . . . . . .2-5, 2-7, 3-2 Channel Status LEDs . . . . . . . . .2-2, 2-3, 2-8, 2-9, 3-2 Connectors . . . . . . . . . . . . . . . . . . .2-4, 2-5, 2-6, 3-2 Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . .2-8 DC Protection . . . . . . . . . . .
LIMITED WARRANTY Lexicon, Inc. offers the following warranty on this product: What is the Duration of this Warranty? This warranty will remain in effect for five (5) years from the original date of purchase. Who is Covered? This warranty may be enforced by the original purchaser and subsequent owners during the warranty period, provided the original dated sales receipt or other proof of warranty coverage is presented at time of service. Damage occurring during any shipment of this product.
Lexicon, Inc. 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.
