mshilarious said:Route the "off" amp to a hot plate, or a DIY resistor setup that can handle the current. With a simple passive switch, there could be a nasty pop though.
I don't see why there should be a pop. Pops happen when a voltage surge or capacitance is suddenly dumped into an input circuit and amplified by the amp, like when you plug a mic into a hot cable or power up a mixer that is plugged into a hot power amp. I have hot switched PA speakers many times and never heard any pops.