Bryston Powerpac 300 SST monoblock amplifier, set of 2 amps. Excellent, original owner, non-smoking home. $1,700 each retail new.
These are the well-reviewed SST design, which is considered bulletproof.
They are heavy, powerful, and revealing amps, with a conservatively
rated 300 watts per channel at 8 ohms. They have had no problems.
I've converted my home theater system to active digital bi-amping, so no
longer needed analog mono amps, that's why these are being offered for