Critical review - Adcom 555 II
Ok, so I have had a chance to listen to this older unit for several days now using a pair of 4312 monitors.
The unit has good power for its 200 WPC rating.
I believe the mid range is relatively flat sounding. The bass and treble are a tad over bearing in my opinion, however.
I have owned many higher power amps in my day (Denon, Marantz, Onkyo, etc.) but I find the newer Crown XLS amps are very nuetral and flat sounding from the bass through the treble range.
All-in-all, I would recommend avoiding older amps in favor of the newer designs which I suppose are better in every way.