Help- Just over the last few weeks I have been getting feed back from my subwoofer when I change channels on my DirectTivo or turn down the volume all the way my receiver (It is a pop, well more like a bump). I currently have a Energy subwoofer hooked up to a Denon 4800. I searched the archives and didn't find anything. Does anyone know why this started happening (I have had this setup for over a year)? Thanks for your help... Ron A.