I recently bought a new entertainment center and after I hooked everything up, a few days later my sub starting having static coming from it. I have disconnected the sub from my reciever but the static is still there. Sometimes it is like a crackling sound others it's just static. Could someone please tell me what this is? Thanks. By the way it used to be plugged directly into the wall but with this new entertainment center it is too large so I bought a few surge strips(similar to Monsters but made for Sears) and installed them behind the screened doors to conceal them and to give myself easy access if I need to remove a certain component. I have 2 strips. 1 for each side of the center.