User manual LEXICON CX

[. . . ] LX Power Amplifier CX Power Amplifier User Guide User Guide IMPORTANT SAFETY INSTRUCTIONS 1) 2) 3) 4) 5) 6) 7) 8) 9) Read these instructions. 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. 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. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. [. . . ] OUTPUT 1 to 7 (CX-7) or 1 to 5 (CX-5) Provide audio output for the speakers. OUTPUT connectors can accept bare speaker wires, banana plug connectors, or certain spade connectors. When using bare speaker wires, loosen the connector, insert the wire into the top of the receptacle, then tighten the connector. Use heavy gauge speaker cable to ensure low-impedance connections between the amplifier and the speakers. Set this switch to off when making or breaking connections to the amplifier. 2. AC Input Connector The AC input connector provides power to the unit with the supplied power cord (3 conductor, 14AWG). For optimal performance, use an isolated power receptacle with adequate current (at least 15 Amps). Line voltages 10% above the specified voltage may damage the amplifier. Line voltages 10% below the specified voltage may cause the amplifier to enter a protection mode, indicated by the red standby LED flashing. 3. INPUT 1 to 7 (CX-7) or 1 to 5 (CX-5) Provide audio input for the speakers connected to the corresponding audio outputs. When using the unbalanced (RCA) audio inputs, make sure the UNBAL/BAL switch located below each XLR connector is set to UNBAL. When using the balanced (XLR) audio inputs, make sure the UNBAL/BAL switch is set to BAL. The illustration below shows the appropriate cable pin-out for XLR connectors. WARNING Do not connect the OUTPUTs of one channel to the OUTPUTs of other channels or to other amplifiers. Note: Speakers must have impedance ratings of 2 or higher. Using speakers with lower than recommended impedance ratings might activate protection modes. Male Cable End 2 = Positive . continued on page 2-7 3 = Negative 1 = Ground 2-5 Basic Operation REAR PANEL OVERVIEW (continued) 5 8 Lexicon 7 3 4 The CX-5 rear panel is shown above. Both are similar, except the CX-7 features two additional channels. 6 2 1 WARNING External wiring connected to connectors marked with the icon pictured at the left requires installation by a qualified person or the use of ready-made leads or cords. 2-6 CX Power Amplifiers . TRIGGER INPUT Enables the amplifier to be controlled by the MC-12/MC-8 or other external devices with a 12V DC trigger output. Connect the trigger output of the external device to the TRIGGER INPUT of the amplifier, and set the TRIGGER switch on the amplifier to ON or DELAY. The amplifier will automatically respond when the external device is powered on and off. 5. UNBAL/BAL Switch Selects between unbalanced (RCA) or balanced (XLR) audio input for each channel. Power the amplifier off or reduce system volume before changing the setting of the UNBAL/BAL switch. If the amplifier is connected to a digital controller such as the MC-12 or MC-8, output levels should be re-calibrated whenever the setting is changed. 8. [. . . ] Contact Harman Specialty Group customer service @ www. harmanspecialty group. com. 3-2 CX Power Amplifiers Troubleshooting & Maintenance Note: Visit www. harmanspecialtygroup. 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 surfaces of the unit with a soft, dry, lint-free cloth. Do not use alcohol, benzene, acetone-based cleaners, or strong commercial cleaners. If the unit is exposed to a dusty environment, a low-pressure blower may be used to remove dust from its exterior. 3-3 A Appendix Specifications . A-3 Appendix SPECIFICATIONS Audio Input Connectors CX-7 CX-5 7 RCA, 7 XLR 5 RCA, 5 XLR Lexicon Performance (Continued) IM Distortion Crosstalk Damping Factor Below 0. 03% at 140W, 8 80dB at 1kHz, minimum 850 at 20Hz, minimum Audio Output Connectors CX-7 CX-5 7 pairs of gold-plated binding posts Input Sensitivity 5 pairs of gold-plated binding posts 2V input for 100W output at 8, balanced inputs 1V input for 100W output at 8, unbalanced inputs Performance Input Impedance Output Power 140W at 8, all channels driven 20Hz to 20kHz Minimum Speaker Impedance Frequency Response THD 2 Gain 20k, balanced 10k, unbalanced 23dB, balanced 29dB, unbalaced Other 20Hz to 20kHz 0. 1dB 10Hz to 100kHz +0. 5/-3dB Below 0. 02% at 140W, 8 all channels driven 20Hz to 20kHz Weight CX-7: 52. 8 lbs (24 kg) CX-5: 47. 1 lbs (21. 4 kg) Trigger Input Power Requirements 12V DC +/- 10% 120V 60Hz 15 Amp (domestic) 230V 50Hz 10 Amp (export) Signal-to-Noise Ratio 110dB 22 kHz bandwidth, unweighted (Ref 140W at 8) Rack Mounting Optional brackets are available for mounting either amplifier in standard 19-inch equipment rack Specifications are subject to change without notice A-2 CX Power Amplifiers Appendix 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 Harman Specialty Group 3 Oak Park Bedford, MA 01730-1413 USA The equipment identified here conforms to the Directive(s) and Standard(s) specified above. Manufacturer: Type of Equipment: Model: CX-7 and CX-5 Power Amplifiers Lexicon CX-7 and CX-5 Date: July 2003 Harman Specialty Group Vice President of Engineering 3 Oak Park Bedford, MA 01730-1413 USA Tel: 781-280-0300 Fax: 781-280-0490 A-3 I Index AC Input Connector . [. . . ]