User manual ELECTRO-VOICE P1200RL

[. . . ] The output devices have a maximum junction temperature of 200 °C (392 °F), so high operational temperatures present no problems. The output devices are mounted directly to the heat sink without mica insulators to ensure better dissipation of heat. Many electronic circuit innovations exist in the P1200. Among the most novel of these circuits is the Dual Differential Discrete TopologyTM. [. . . ] This circuit is part of the front end of the amplifier and uses discrete electrical components instead of integrated circuits and is fully symmetrical for both polarities. The P1200 has sophisticated protection circuits that guard it and the load from problems. Protection circuits guard against overload, overtemperature, shorted outputs, radio-frequency interference and dc faults. The output devices are protected against damage from reverse feeding of electrical energy (back EMF) and are switched on via relays to avoid transients which could damage speakers. The P1200 has built-in limiters to protect speakers from the deleterious effects of amplifier clipping. The limiter's action is governed by very sophisticated input/output comparators which have acoustically optimized time constants to preserve the integrity of the source. The limiter's time constants are switchable fast/ slow, so the limiter may be matched to the application for which the amplifier is being used. The P1200 has built-in switchable high- and low-cut filters. These filters attenuate infrasonic and ultrahigh-frequency signals, preventing them from being amplified; this allows more effective use of the amplifier's power and adds a measure of load protection. These filters are switchable on/off for use in applications utilizing frontend units (like crossovers or equalizers) which have these filters built-in. A multifunction display keeps the user informed of the operating status of the amplifier. Separate LED displays for each channel show power on, input signal, output signal, limiter on and protection active. Input connections for each channel shall include a 3-pin female XLR-type connector wired in parallel with a male 3-pin XLR output connector for signal routing. Output connectors shall be Neutrik Speakon ® NL4MP's for channels A and B, and for bridged operation. Front-panel indicators shall include power on, input present, output, limit and protect LEDs for each channel. Front-panel controls shall include a power switch and level controls that shall be calibrated, detented potentiometers and have accurate markings. The amplifier shall have a constant-gain option that, with input level controls full clockwise, provides a 26-dB voltage gain that is identical to that of all Electro-Voice Precision SeriesTM power amplifiers. The power amplifier shall meet the following performance specifications: maximum input voltage, 7. 75 V rms; rated output power from 20-20, 000 Hz at less than 0. 1% THD, each channel, >350 watts into 8 ohms, 500 watts into 4 ohms, 600 watts into 2 ohms, 1, 000 watts bridged into 8 ohms and 1, 300 watts bridged into 4 ohms; hum and noise, at least 100 dB (Aweighted) below rated output power; frequency response, 10-30, 000 Hz(+0/­1 dB) at any output power up to rated output power; damping factor, >300 at any frequency up to 1 kHz in any mode with an 8-ohm load; THD (total harmonic distortion), <0. 05% at 1 kHz at rated power; transient intermodulation distortion (DIN 30 or DIN 100), <0. 01%; crosstalk, <70 dB below rated output power. Dimensions shall be 88. 1 mm (3. 5 in. ) x 483 mm (19. 0 in. ) x 426 mm 16. 8 in. ) hwd. The power amplifier shall be the Electro-Voice P1200. UNIFORM LIMITED WARRANTY Electro-Voice products are guaranteed against malfunction due to defects in materials or workmanship for a specified period, as noted in the individual product-line statement(s) below, or in the individual product data sheet or owner's manual, beginning with the date of original purchase. If such malfunction occurs during the specified period, the product will be repaired or replaced (at our option) without charge. The product will be returned to the customer prepaid. Exclusions and Limitations: The Limited Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items described in the individual product-line statement(s) below, or in the individual product data sheet or owner's manual; (c) malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner's manual; (d) malfunction re- sulting from misuse or abuse of the product; or (e) malfunction occurring at any time after repairs have been made to the product by anyone other than Electro-Voice or any of its authorized service representatives. [. . . ] The product will be returned to the customer prepaid. Exclusions and Limitations: The Limited Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items described in the individual product-line statement(s) below, or in the individual product data sheet or owner's manual; (c) malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner's manual; (d) malfunction re- sulting from misuse or abuse of the product; or (e) malfunction occurring at any time after repairs have been made to the product by anyone other than Electro-Voice or any of its authorized service representatives. Obtaining Warranty Service: To obtain warranty service, a customer must deliver the product, prepaid, to Electro-Voice or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice. A list of authorized service representatives is available from Electro-Voice at 600 Cecil Street, Buchanan, MI 49107 (616/ 695-6831 or 800/234-6831). [. . . ]