After buying a new 5.1 DTS receiver, I bit the bullet and bought some good S-video, optical cables and speaker wire, getting set to test my new setup. But to my dismay, as with my old receiver, my rears were sounding as if they were blown. I did not calibrate anything or set any levels since the kids are asleep, but the woofers don't seem to be torn. It has a very scratchy and unclear sound. It also seems more evident at low volumes. What's up here? Before I open the new set of rears I bought, is there some way of testing the speaker? I know it is not the receiver since this one is new. Any suggestions would help!