Cooling Requirements
The Professional Series amplifiers use a
If either heat sink gets too hot, its sensing circuit will open the output relay, disconnecting the load from that particular channel. If the power transformer overheats, another sensing circuit opens the output relays on all channels until it cools to a safe temperature.
It is important to have an adequate air supply at the back of the amplifier and enough space around the front of the amplifier to allow the cooling air to escape. If the amp is rack mounted, do not use doors or covers on the front of the rack; the exhaust air must flow without resistance. If you are using racks with closed backs, use fans on the rear rack panel to pressurize the rack and ensure an ample air supply; also make sure that there is one (1) standard rack space opening for every three mounted power amplifiers.
The Professional Series amplifiers are supplied with cooling fan air filters. The filters snap in place over the fan housing. Any filter will decrease airflow somewhat, so use the filter only when the amplifier is used in a dusty environment without a filtered air supply. The filter element must be cleaned or replaced periodically (see the section on Amplifier Maintenance for filter service procedures).
Operating Precautions
Make sure the mains voltage is correct and is the same as that printed on the rear of the amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by any warranty. See the Connecting Power section for more information on voltage requirements.
Note: Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also, as an extra precaution, have the attenuators turned down during
Although the Professional Series amplifiers have AutoRamp circuitry, which raises the signal level gradually after the output relay clos- es, it is always a good idea to have the gain controls turned down during
Consult the Wire Gauge Charts to determine proper gauges for different load impedances and cable lengths. Remember that cable resis- tance robs amplifier power in two ways: power lost directly to resistance (I2R loss), and by lowering the total load impedance. Also make sure the mode switch is correctly set for the desired application. See Sections on Stereo, Parallel, and Bridged Mono Operation for more information.
The Crest Audio Model 7301 Power Amplifier
The Model 7301 is specifically designed for use in
The Crest Audio Model 10004 Power Amplifier
The Model 10004 power amplifier is unique in that it is a
Crest Audio Pro Series Power Amplifiers | Page 3 |