Well I still have an Adcom 555 used in bridge mode i believe is 600 watts at 8 ohms and I use it for my new JBL-Pro Cinema Subwoofer,it is perfect for my needs, no problems in the last 15 years,also I had some 565 mono blocks that I gave away to my brother when I purchased the subwoofer(a real Sub)I find no need to have a lot of power for my mains since they are very efficient.Anyway no problems at all with the Adcom amps.