Help please. Recently moved to a new house and all the audio equipment had been left in boxes, but with no instructions..... I am trying to connect the sub woofer (KEF/CODA S sp2299) to a Yamaha RX-V592RDS amp. I have connected the cable from the rear of the amp (connection subwoofer), to the low level input of the sub woofer.... Unfortunately NO sound. Does anyone have any ideas?? Speakers connections are working fine.