I have a Sherwood RD-6106R cinema amp and Marantz hi-fi amp. My speakers are Mordant short 608s. I would like to run both cinema and hi-fi through the same speakers. I have tried the pre-out on the Sherwood to route the signal through the hi-fi amp and then drive the speakers from the hi-fi amp. This did not seem to work - it seems no signal received. Can anybody help?