Crest Amplifiers are designed for years of reliable, flawless operation under rigorous use. These power amplifiers offer the sonic superiority and unsurpassed reliability for which Crest Audio is famous, while remaining surprisingly compact.
Crest Amplifiers are designed for years of reliable, flawless operation under rigorous use. These power amplifiers offer the sonic superiority and unsurpassed reliability for which Crest Audio is famous, while remaining surprisingly compact. Advanced technology and extensive protection circuitry allow operation with greater efficiency into difficult loads and power conditions. All Professional Series amplifiers are fully compatible with Crest Audio’s Octal Socket Accessories and the NexSys computer-controlled audio system.
The IGM (Instantaneous Gain Modulation) circuit of Crest Amplifiers ensures trouble free operation into loads as low as 2 ohms. The clip limiting circuits protect drivers and ensure that sonic integrity is maintained, even in extreme overload conditions. Crest Audio’s high-efficiency design uses tunnel-cooled heat sinks and variable speed DC fans. This cooling topology maintains a lower overall operating temperature, resulting in longer output transistor life. Although the Crest Audio Professional Series amplifiers are quite simple to operate, and are housed in ultra-strong steel chassis, improper use can be dangerous.
Some of these Crest Amplifiers models are very high-powered amplifiers that can put out high voltages and sizable currents at frequencies up to 30 kHz. Always use safe operating techniques with these amplifiers. Professional Series power amplifiers will mount in standard 19-inch racks having sufficient depth. The 10004 & 10001 amplifiers are four rack units high; the 9001 and 8001 models are three rack-spaces high, while the remainders are two rack-space units.
All two and three-rack space units of Crest Amplifiers are provided with four front panel mounting holes. The 9001, 10001, and 10004 have eight front panel mounting holes. Crest Audio recommends using all mounting holes to secure the power amplifier in the rack; this will ensure the safety of the equipment. Rear mounting ears are also provided on all amplifiers for additional support, which is essential in non-permanent installations like mobile or touring sound systems, but recommended for permanent installations as well. Because of the cables and connectors on the rear panel, a right-angle or offset screwdriver or hex key will make it easier to fasten the rear mounting ears to the rails.
The Professional Series Crest Amplifiers use a forced-air cooling system to maintain a low, even operating temperature. Air is drawn into the amplifier by fan(s) on the rear panel, courses through the cooling fins of the back-to-back (tunnel-configured) channel heat sinks, and then exhausts through the front panel slots. 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 of Crest Amplifiers 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 of Crest Amplifiers, 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 Crest Amplifiers are supplied with cooling fan air filters. The filters snap in place over the fan housing.
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