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hot amp switch box

Been surfing the net with no luck trying to find plans for a diy switching box that would allow me to have two amps fired up and switch between them to one set of speakers. I imagine that the one that isn't connected to the speakers would have to be connected to a dummy load and that "break before make" switches would have to be used. So far I have not found anything and am hoping some here may know of something. I want to use it to A/B two amps.
The other thought I had was to put resistor loads across each set of speaker terminals on each amp so that they would always have a load and then I could just use a simple selector switch. The thing I don't know is how that would affect the sound. How little resistance could I get away with and still not hurt the amp? Would even 2 ohms change the sound of the speaker?

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Topic - hot amp switch box - vinnie2 15:18:52 06/06/17 (37)
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