I've just pulled out my HT equipment from storage now that I've got my HT all set up and ready to go. Anyway, my 25-31pc is an older one (4-5+ years old). It's got the 200W amp (I think). It's like my receiver (Yamaha RX-V3000) isn't recognizing it. The rest of the system sounds excellent. I haven't changed any of the receiver settings from when it was working, but I have checked them all. Checked sub fuse, it's good. Sub cable is the Better Cables one that came with it. It's weird, if I take the cable and touch the back of the receiver anywhere, the sub will hummmmmm. Like it's grounding or something. So the woofer moves. It'll hum louder if I turn it up. I've tried both sub inputs. Is there anything else I should check? I'm sure that my receiver settings are good. I don't have another sub to plug in to make sure it's NOT the sub. Thanks.