Check the listing for details. USED - Crest Audio 4601 Power Amplifier. Condition: Used. Listed at 325.00 USD. USED AMPLIFIER Product Description The Crest Audio Model 4601 power amplifier is a compact, medium-power amplifier designed to meet the demands of con- cert touring, studio monitoring, high-quality sound reinforce- ment, and professional installations. Crest Audio developed this model in conjunction with the biggest names in touring sound. These amplifiers meet the spe- cific demand for medium-power amplifiers with full-range capa- bilities, but optimized for mid- and high-frequency applications. The output section operates purely in Class AB, with no dynamic switching of supply rail voltages. The result is the cleanest, most transparent mid-and high-frequency audio power imaginable from amplifiers that never compromise quality. A forced-air configuration is used to cool channel heat sinks mounted in a back-to-back tunnel arrangement. An actively bal- anced female XLR input connection, Octal Socket, and 5-way output binding posts are provided for each channel. The 4601 is fully compatible in design with other Crest Audio Professional Series amplifiers, Octal Socket Accessories, and the NexSys® computer-controlled audio system. Design and Construction The 4601 is built exclusively in Crest Audio’s own USA manu- facturing facility, with internal components selected for premium quality and proven durability. Each modular subassembly is pre- tested, and the assembled 4601 receives a rigorous “hot room” burn-in before thorough final checkout on precision test equip- ment. Only high-grade components are used for the modular sub- assemblies in this ultra-strong, steel single piece chassis. 4601 Features • Crest Audio’s legendary “overbuilt” power supply • Toroidal power transformer • Latest generation of high-speed, wide-bandwidth output devices • Twin tunnel cooling with back-to-front air flow • Dual, variable speed DC fans • High thermal mass heat sinks • Balanced XLR inputs • 5-way output binding post connectors • Stereo/Parallel/Bridged Mono mode selector switch • Rear panel ground lift jumper • 4601 protection circuitry: - Clip Limiting prevents speaker damage with gentle gain reduction at clip threshold. - IGM (Instantaneous Gain Modulation) monitors connected loads to detect conditions that may overstress output devices. - AutoRamp gradually increases gain to attenuator setting level when amplifier is turned on. - Other protection circuitry: comprehensive thermal manage- ment, and short circuit, DC voltage, turn-on/off transient, current inrush and sub/ultrasonic input protection. • Recessed, stepped attenuators • Front panel circuit breaker/power switch • Modular construction