Up for grabs is a few Crest CA9 power amps here's the write up from Crest: Experience the legendary sound of Crest Audio. The Crest Audio CA 9 provides high power output coupled with true clarity, and is well-suited for high-powered subwoofers and passive full range systems. The CA 9 rack power amplifier is designed to achieve unsurpassed sonic performance and long-term reliability. With professional power-handling capabilities and exceptional low-end response, this power amplifier is an ideal choice for installations and touring applications that demand the finest audio quality. 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 CA9 will drive 2 Ohm loads safely without compromise in performance. The CA series provides tremendous value in proven amplifier technology. CAs form the backbone of discriminating rental systems and high-power club installations worldwide. Auditoriums, churches, regional tour sound companies and mobile DJs are all ideal candidates for the CA Series' combination of value and sonic quality. Ive got a few of them... One is internally bridged and is running mono The second is just standard stereo 2 channel Im asking $500 a piece, might give a deal if you want both. i found some links for more specs and info: https://www.gearclubdirect.com/crest-audio-ca9-power-amplifier/ here's a link i found for the Manual: https://www.fullcompass.com/common/files/16539-Specsheet.pdf mine are a little older than the ones I've provided links for...but i couldn't really find much info on the older ones. These ones don't have the bridged/stereo mode selector switches on the outside hence why one is internally bridged. They have been tested and work great! Swing by and check em out!