Should it be OK to hook my M60s to both the A and B output of my Onkyo TX-DS939? The idea behind this would be to have A setup as 5.1 with everything adjusted just right(set to small), and have B setup for just plain stereo with the speakers set to large and the subwoofer off.

I'm concerned that feeding the power coming out of A back into B (and vice-versa) could damage my receiver. Does anyone know if it would be a problem, or should I try to get Onkyo to answer the question?

Michael