I have a Kenwood Finline HTB-S715DV home theater. It's a 6.1 home theater system. It has pre-outs for surrounds and a subwoofer. I tried connecting the pre-outs to a BePro Mixing Amplifier but got no sound from the speakers connected to it nor any response from the sub on the BePro. Am I doing something wrong or is this setup not possible? http://www.kenwoodusa.com/product/product.jsp?productTypeId=175&sortBy=price&productId=2618 http://www.acekaraoke.com/bepro-b1-bbe-vocal-cancel-karaoke-machine-amplifier.html Thanks.