I eel bad when I see someone throwing good money after bad. Here is one fact for you: You said that you hardwired about 6 -8 pairs of speakers to the speaker terminals on your A/V Receiver. That is a deadly & costly mistake. I would be willing to bet you that this speaker load was below 2 ohms. That could easily destroy your A/V Receiver and/ or your speakers. When you raise the volume with that senerio, you start blowing equipment up. That cheap switcher you used made it even worse. I use & buy Niles switchers, selectors. They are much more robust, and they give you real impedance matching. Don't buy that cheap crap. It will come back to haunt you. Everything Niles sells, including speakers are really great. Had you brought in a Pro to begin with, you would not have destroyed all of this equipment. I use a true impedance meter to know for sure.