For eight years my Rel Strata has run with one outlet socket from the Yamaha Processor and left and right plugs into the Rel Strata Sub Woofer. The Rel stopped working when I installed a new Denon Processor but kicked into life when I removed one of the plugs. My dealer say the Rel doesn't have a Left and Right Input (??) but that only one plug is required at both ends. Can anyone explain this please?