I have a 12 channel B&K Amp, and I would like to use it to replace a 2 channel Carver amp I have been using for 4 pair of outdoor speakers. My issue is the speaker selector I have now, only has connections for a single amp source which up to this point has been my 2 channel amp. Is there such a thing as a selector which I can input 4 of the 12 channels of the B&K amp? I need to be able to turn on\/off certain pairs of speakers outside. Or is there another solution? I only listen to one music source for all 4 pairs of speakers, but I figured the B&K at 60wpc direct to each pair of speakers would be better sounding than the 100wpc amp going thru the speaker selector and powering all 4 pair I have now. Thoughts?