A friend has asked me to come over to his new place to hook up his new receiver to the existing surround system the previous owner left. We're talking 5 speakers, in wall wiring, fitted w/ usb connectors. I haven't seen it yet but I'm not familiar w/ that scenario. I have 3 full blown systems set up and running around my place and none of my speakers have usb fittings. My new receiver has hdmi and usb for accessories but regular rca jacks for the speakers. If he's not making this up is there some kind of conversion box for his usb fitted speakers to plug into w/ rca outlets on the other side or does Belkin make a simple usb to rca jack conversion? Thanks!