Let me get this straight, you have both amps connected to the same speakers at the same time? A major no-no in my experience. Use some type of external switching box to select EITHER amp; I am surprised you haven't blown at least one up. I am not sure what you are doing but the driving amp will see the amp that is off [ it IS off isn't it?] as part of the load it wants to drive. This is not good! Either get two more speakers, a switch box or change the connections each time.
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