I'm considering purchasing a Klipsch KSW-12 subwoofer for use with my stereo system. The receiver I'm using is an Onkyo TX-8511, and one pair of speakers is connected to it. There are no subwoofer specific outputs, but I was wondering if I could use the "Tape Out" connections (2 RCA - L and R) to go to the subwoofer? Thanks for your help.