Listening to 2 guitar amps simultaneously

1. Can you hook up two guitar amps to one speaker?

Can you hook up two guitar amps to one speaker?

You cannot hook two amps to a single set of speaker terminals because the amps will see each other and usually blow up, blow fuses, or go into protection. If you speakers have biwire terminals and you remove the jumpers then you can safely hook up an amp to each pair of terminals.