I've had my Kenwood 6070 for just under a year or so with no problems. Now after disconnecting my 31 band EQ and going straight to my subs(to get the lost headroom I was missing), anytime I switch inputs, hit mute, or the auto selective input changes I get a loud thump from my subs. It's very loud and scares everyone in my HT. I checked all of my levels everywhere there is one and they're all normal. It has to be coming from the receiver or I thought it might even be a grounding problem of some kind. I need anyones suggestion as to what my possible problem might be. I'm still under warranty so they'll be footing the bill but I'd still like to know as much as I can before calling Kenwood. Thanks in advance.