To avoid a switch, I left a run of speaker cable from my speakers to a hook on the wall behind them that I could reach easily. Next, pull up the desired set of speaker wires from the desired amp (different colored tape on wire ends) and a spot of color tape on the front of each amp for feeble minded reminder.
wbt type bananas with set screws and center pin tightening
when using spades (connection at speakers/amps, I like the two set screw type

