2 Radios plugged into 1 Speaker?
You CAN buy 3 pole relays and switches. This may be the easiest solution. (A 3PDT switch has 9 terminals and is essentially 3 x "two way" switches in one housing)
One pole to switch power between the two
The two other poles to switch both speaker terminals.
3PDT relay would have 11 terminals -- 9 for the contacts and 2 more for the coil.
You CAN buy 3 pole relays and switches. This may be the easiest solution. (A 3PDT switch has 9 terminals and is essentially 3 x "two way" switches in one housing)
One pole to switch power between the two
The two other poles to switch both speaker terminals.
3PDT relay would have 11 terminals -- 9 for the contacts and 2 more for the coil.