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Good working condition, as pictured, 30 day guarantee Please never hesitate to ask questions… If you ever have any issues with us we promise to make it right! Product Description The Crest Audio CA12 professional power amplifier is designed to achieve unsurpassed sonic performance and long-term reliabil- ity—even when operating under extreme stress—in touring or fixed installation applications. Absolute sonic accuracy is the hallmark of every Crest amplifier. Bass is solid and defined to the limits of audibility, with ample current reserves delivered by an “over-engineered” power supply and advanced Class H circuitry. Wide-bandwidth output devices assure detailed, transparent high frequency response. And, thanks to Crest’s exclusive IGM circuit, the CA12 will drive 2? loads safely without compromise in performance. Construction and Quality Control The CA12 is built exclusively in Crest’s own USA manufactur- ing facility, with internal components selected for premium qual- ity and proven durability. Each modular subassembly is pre-test- ed, and the assembled CA12 receives a rigorous “hot room” burn-in before thorough final checkout on precision test equipment. CA12 Features • Crest’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 • Massive, extruded aluminum heat sinks • Balanced XLR and 1/4-inch (TRS) inputs • 5-Way Binding Post Outputs or SpeakonTM connectors (market dependent) • Stereo/parallel/bridged mono mode selector switch • Ground lift switch • TourClass® protection circuits: - ACL (Active Clip Limiting) prevents speaker damage with gentle gain reduction at clip threshold. - IGM (Instantaneous Gain Modulation) monitors speaker loads to detect conditions that may overstress output devices, allowing safe operation into nominal 2? imped- ances. - AutoRamp gradually increases gain to attenuator setting level when amplifier is turned on. - TourClass also includes comprehensive thermal manage- ment, and short circuit, DC voltage, turn-on/off transient, current inrush and sub/ultrasonic input protection.