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CROWN-CL4 Professional Commercial Amplifier |
The amplifier shall be a solid-state two-channel model. Each amplifier channel shall have the ability to operate individually, or paired with the other channel in a bridged configuration to provide increased output voltage over that of an individual channel output. Front panel controls shall include a rocker switch for selecting power on and off. Rear panel controls shall include a recessed detented rotary control for each channel to adjust input level, a recessed switch to select Stereo or Bridge modes of operation, and a reset switch for the AC mains circuit breaker. Internal controls shall include a jumper block to allow selection of input sensitivity of either 0.775V or 26 dB gain as a service option. Sensitivity shall be factory-set to 1.4V. Front panel indicators shall include a green LED to indicate that the amplifier is turned on and power is applied; a red LED for each channel which shall blink to indicate any of the following 5 conditions: 1) When the amplifier is first powered up, until the unit is ready for operation. 2) If the heatsinks reach a temperature above normal working limits. 3) If the transformer thermal protection circuit is activated. 4) If the amplifier wires develop a short circuit, and 5) should the amplifier output stage become non-operational; a red LED for each channel which shall turn on to indicate when distortion of any type becomes audible in the amplifier output; and a green LED for each channel which shall flash dimly to indicate when a low-level signal (> -40 dBm) is present at the input of the amplifier. Rear-panel connectors shall include a combination XLR and ¼-in (6.35 cm) phone connector in parallel with a three-terminal barrier block for each channel for balanced input connection (on the standard input module); a four-terminal touch-proof barrier block for output connection (on the standard output module); and an RJ11 jack for connection to an external circuit for the purpose of remotely monitoring fault conditions. The amplifier power requirements shall be 100-240 VAC, at 50/60 Hz. AC line current requirement shell be 8.5 A at 100 VAC; 7.1 A at 120 VAC; and 3.7 A at 230-240 VAC. A detatchable IEC 15A to NEMA 5-15P AC line cord shall be provided for AC connection. Typical quiescent power draw shall be 140 watts. |
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