SOLD Long, but hopefully complete with all the information anyone needs. These are close to the Parasound 1201 single mono's, Parasound cut many corners after they purchased the leftover parts when SoundStream left the home audio market. These are of excellent build quality, the are very powerful and sound ever so sweet. Parasound has them rated @ 150w, soundstream underrated them. I only have one spare tri-channel mono block to sell. I purchased many brand new boxed M3 amps in a buy-out some time ago, I sold most of the extra's, the rest I use in my systems. I have this one as an extra, very light use, it has a couple small mares on the top, You would really to to look very hard to find them. The retail for this Ultra THX M3 amp was $1200. USD. Will sell at $420. you pay all shipping, will be shipped in the original box & packing, user's guide include. That's $140. per mono block channel. AVR user's Can you say front & center channels with me? These are Low Impedance / High Current Design FTC Power Rating Output Power: 120W @ 8 350 input Connectors: 3-pin XLR,RCA Phono Output Connectors: 6 Gauge, 5-Way Binding Post Power Supply: High Flux Toroidal Power Transformer Power Supply Requirements: 120VAC 100watts / 1 amp (average) Dimensions (HxWxD) 5.75" x 17.0" x 16.0" ( 14.6 cm x 43.2cm x 40.6cm) about 42 lbs, 50lbs shipped. This is Ultra THX, Three singles placed together with a common faceplate and rear support angle. They can be separated and used for custom installs. 120 THX watt per channel into 8 ohms, this power is well underrated, the headroom is unbelievable, Yes SOLID at 4 ohm loads. Power amplifier features glorious sound quality and superb Mono Block build quality. The M-3 is the perfect choice for the enthusiast that is trying to mate home theater with a high quality music system. If you already have a great high end amplifier for your main channels, then the M-3 is the perfect solution for driving your center and surround sound channels. The size of the Toriodal Power Transformer in each of these are that of many well known five channel amps, and those all share one. The M-3 has a total of three, one in each case at 5"dia x 2" thick. And these are no small or lightweight mono's. These make the Marantz MA-500/700 Mono look very small, and the toriodal power supply small, Two NIPPON CHEMI-COM 63v10,000uf Caps in each. These are XLR Balanced and Unbalanced have remote power on, Heavy 5-way binding post good for up to 6 gauge wire. Each channel has it's own power cord and fuse. ZERO cross talk with these. Thanks for looking. Jerry Pictures have been removed.