I have an adcom 450 pre-amp and 2 adcom 555II amps bridged mono. I like the sound of the two 555's bridged a lot better than just the one. The 555 is 200w times two. Bridged they put out 600w per. I know this is not the most liked amp on the site, but for the 1k i paid for the pair i don't think i did that bad. And if you don't like them i'm sure you could sell them on ebay for the same price you bought them for. They seem to sound alot smoother than just the one. But then again i'm really just starting out so what do i know.
good luck
tommy
good luck
tommy