"You said "sometimes" which leads be to believe that your HK's 75W are being taken to task during movies that have large dynamics. Or, maybe you have a damaged tweeter or amplifier channel."

We've (I!) have had our 635 cranked to some extremely loud levels over the past couple of years with the 150 and have never felt as though the receiver was ever peaking. Unless JB is turning the volume level to the utmost extremes, which from the way he is describing I wouldn't think so, I wouldn't believe it's a power issue with the 635 ... I'm betting it's something else.

Rick
Our Room

smile