I have the same problem with my TV upstairs when viewing over the air analog signals amd my EP500s are working in my HT in the basement. Mine is not a vibration issue since the TV is pretty far away from the subs and the subs are not working that hard. I have not tried to see if that same TV has interference if I'm watching a movie on it or if the interference is only when viewing an OTA analog TV signal. The subs do not seem to affect my HT digital tuner that's connected to the projector when I'm watching digital TV in my HT so I haven't really taken the time to research further. The interference is worse on the stations that have the weakest signal.
