Bought an impedance matching speaker selector from Monoprice, the SSPRO8. No matter what we do, we cannot turn off specific speakers. In fact, unless you disconnect it from the receiver or turn the receiver off, you cannot stop audio. If it’s connected, it’s playing. Even selecting the A or B channel has no effect on audio. The receiver is a Sony, 5 outdoor speakers. 4 Klipsch Rock speakers, 1 KLH outdoor speaker. #20182651