This may be an unusual question, but I have always wondered about this. When you have a reciever on, but no sound signal is coming through(TV,DVD, Music, wtc) , should ANY sound be coming through the speakers? When I get close to my speakers, I can hear a distant hiss. Is this normal, or is it the result of line interference, poor or malfunctioning speakers, bad cables, or any other sort of problem? Please help me alleviate my ignorance. Thanks.