So I have a peavey irp3000 amp power my subs run off an xlr cable from my integra 9.8 pre amp. Problem is the sub is humming like crazy. I've tried to lift the ground on the amp and the pre amp... No change. If I mute the avr it stopes or if stop my DVR it shuts up. But the problem is on my other impute to so I don't think the DVR is to blam. Any ideas?