It seems laely, over the past 3-6 months, I have had some bad vibration on certain channels. This happens alot on the premium channels. I was wondering if it has anything to with the Dolby sound that movies are putting out. I am using just the speakers I have on my Philips plasma. I thought some screws might be lose, but I checked them and they were OK. Is there anything I can do to stop this short of buying a HT system? Thanks