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Old 10th August 2020
Switching inputs is not a problem. Switching speaker outputs has the potential to fry the power amp stage, especially if it's solid state and an input signal is present.

One way to do it is with a switch sequencer.
1 - disconnect amp 1 input from the signal source and tie it to ground.
2 - switch speaker from amp 1 to amp 2
3 - disconnect amp 2 input from ground and connect it to the source.

Note that, whichever amp is not being used, should have it's input grounded.

It could be done with a stepping relay, though it would probably be cheaper to do it electronically.