I have owned the SC-37 for over a year. I purchased it off Amazon so it is not under warranty. Until yesterday all channels were driven by an Anthem 5 channel amp (center, rs, ls, rsl, rsr) and an ATI amp (driving l and r mains). I was using the SC-37 as a processor only. I removed the Anthem and connected the speakers (center, rs, ls, rsl amd rsr) directly to the SC-37's amps. Much to my surprise, I got no sound from the speakers connected directly to the SC-37. I did a reset with no luck. The only sound I got were the front L and R main speakers that were being driven by the ATI amp and connected to the pre-outs? Unfortunately, I never tried to drive any speakers using the SC-37 upon receiving the unit. Any ideas? BTW, I connected the speakers to the SC-37 using both Radio Shack single banana plugs and also bare wire.