Well guys,I just got home from the hospital were they perform back surgery on me,so I might be still high from the drugs,but my Adcom 555 is rated at 850 watts at 4 ohms continuous,I am using it to power a SVS 25-31CS PLUS tune to 20hz,I have it calibrated at aproximatelly +3db's hot and I have never had any problems with my amp.I may some times bottom out my subwoofer,but my 555 never clipps in bridge mode;and I am playing at almost Dolby Digital reference levels (which are -2 db's under reference)Also when I bridge my amp my gain seems to incres by 3 to 4 db's.Just my two centes. J.R.