I have just bought a 2nd hand Aiwa TS-W7 sub woofer I would like to connect it to my Yamaha DSP-E800 I have just connected with the black RCA plugged cable to the Yamaha sub woofer and the input 1(From super woofer terminal)I can't hear anything! but there also speakers in and out connections. Does anyone have a wiring diagram for tha Awai. Please? Or how to test the speaker.