I have two receivers - a Yamaha RX V373 that I use to power my inside home theater system, and an old Sony STR K665p that I would like to connect to eh Yamaha system to power my outdoor speakers (so I can play the same music or movie inside and out). Is this possible? If so, please let me know how. I have connected the Audio out on the Yamaha to the DVD In and Video In (only choices) on the Sony, but that doesn't seem to connect them. Thanks,