I had a strong hum from my new sub. After much trial i found it was coming from the cable tv, Doesnt matter if its on or off. It stops if i unhook it from the wall or if i un hook the hdmi. It was the same with diffrent cables-swapped boxes ect... For the 1st time ever i hooked the cable into a power conditioner and the humming stopped. My question is am i now just hiding a problem or is this the proper design solution of the conditioner?