Hey guys. This is my first post here. I'm not a 100% this is where I am suppose to post about this topic but i'm having some sound problems. I just purchased an onkyo s590. when i turn on the surround sound i get this very annoying humming noise. If i turn it back to stereo the noise is gone. I unplugged all the electronics one by one and it only disappears when the electronic from where the sound is coming from is unplugged (either the dvd or the cable box). I am using a optical cable from dayton. i am changed the orginal wires to 16 gauge wires from radio shack. all the wires are plugged into the spring clamps. can anyone help?!