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External speakers can be very small. I can't imagine you can't find an extra 4 square inches in a vehicle somewhere. Connecting two radio's outputs to one speaker is asking for trouble. A diode won't work for isolation, this isn't DC.
A DPDT switch is your best bet. If you could possibly find a dual voicecoil speaker that would work too. I don't know of any smaller than about 8" however.

[QUOTE="KD4UPL, post: 443549, member: 26863"] External speakers can be very small. I can't imagine you can't find an extra 4 square inches in a vehicle somewhere. Connecting two radio's outputs to one speaker is asking for trouble. A diode won't work for isolation, this isn't DC. A DPDT switch is your best bet. If you could possibly find a dual voicecoil speaker that would work too. I don't know of any smaller than about 8" however. [/QUOTE]

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