I have noticed with my HT setup that there seems to be a slight hiss in the background when I have my receiver on. I am not cranking the volume loud and it is present even while viewing normal cable programs and movies. The TV is a Zenith 36" hooked to digital cable and the receiver is a Pioneer.I have attempted to keep power cords away from the speaker wires, which are not any type of exotic wire brand (I believe they were radio shack). I am not sure where to start looking for the source of the hiss. I can probably eliminate it by turning up the bass or lowering the treble on the receiver.