Hello Richard, thanks for the reply. The problem with summing the “A” program into the “B” amplifier is that they’ve already run speaker cable from the “A” system over to where the “B” system will be set up. I don’t think they want to run a mic/line level signal over as well. From what I understand, we wouldn’t be able to take that signal down to a level the “B” amplifier could accept as an input since it’s already been amplified by the “A” amplifier.
We don’t have an issue of overloading the “A” system. They actually removed two horn speakers from it when setting up the “B” system. It has a pretty large amount of room to play with, wattage-wise.
We could just cut the wires coming out of the “B” amplifier, the “B” system speakers, and the speaker wire coming from the “A” system, and put connectors on the ends to easily unhook the “B” system speakers and connect them to the “A” system, but I was hoping to find a switch so we didn’t have to manually disconnect and reconnect speaker wires each time we wanted to switch.