let me start by saying i had no problems with my sub untill today.... I have comcast cable installed i turned on the reciever to hear the sound and all of a sudden i am getting the loud buzzing from my sub and the rest of my speakers. I tried to pull the power from the cable box and it did not affect the noise. I took the sub upstairs to a different sub..same problem. once the sub was removed from my usual spot all the other speakers went back to normal. I am lost as to what is causing this problem...