Recently I purchased a JBL 5.1 SCS135SI home theater speaker set from the online store JandR.com. When I setup the speakers with my new Onkyo DR-C500 DVD Receiver and played my favorite movies, I can hear some low background noise from my two JBL surround speakers. How do I know this? I turned off the volume of the receiver, then press my ear against each of the 5 speakers. I don't hear any sound from my center, left, and right speakers. But I could hear some noise from my surround speakers. Has anyone who purchased this JBL model encounter this? Is this normal that surround speakers make this type of noise? Is the problem due to the length of the speaker cable wires?