Hey all,

I have the 990/7700 combo and 2 Monster 3500 power conditioner's in my system. The 990 is plugged into the pre outlet which is switched, the amp into the amp outlet which is delayed. I never had any problems with sounds. Now when I push on the Monster 3500, I get a strage sound from the speakers as the amp is staging on. Kind of a buzzing type noise for just a second or 2.

I noticed that the 990 has no ground prong on the plug end, not sure about the 7700. Would I benifit from say a 3 prong plug end?

what would all of sudden cause this. I am redoing all the cables and as far as equipment, the only things I have added are a Marantz switcher and a Pioneer Blu-ray player.

Thanks!!!!