Hi guys...first post here and I wish it were under better circumstances but my 7700 is doing something similar to grimsters unit.

Mine makes the LOUD buzzing from the left rear when powering up. It goes away once the power light turns blue and then it will buzz and pop for a few seconds when I turn off the amp.

Lol the loud buzz it makes reminds me of the old sci-fi movies where they show the big transformers with static electricity all around them.

I shot an email out to tech support on Friday but haven't heard anything back yet.

Grimster, did they give you any idea what the problem might be?

Thanks,
Ken