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So in effect, you want to mix two signals. I can think of two ways of doing that, one by using a 'mixer', the other by putting one 'source' to the 'L' speakers, one to the 'R' speakers. The first way means more expense and another gadget. The second would mean some rewiring and would still be subject to possible hums/buzzes. That "Ground Loop Isolator" is probably a simple transformer/capacitor circuit for isolation, and would probably work (one in each radio's output line), and similar to the isolation circuits of most radio/computer interfaces. (That's just a guess about that 'isolator' thingy, I've never seen one.)
Good luck.
- 'Doc

[QUOTE="W5LZ, post: 367434, member: 129"] So in effect, you want to mix two signals. I can think of two ways of doing that, one by using a 'mixer', the other by putting one 'source' to the 'L' speakers, one to the 'R' speakers. The first way means more expense and another gadget. The second would mean some rewiring and would still be subject to possible hums/buzzes. That "Ground Loop Isolator" is probably a simple transformer/capacitor circuit for isolation, and would probably work (one in each radio's output line), and similar to the isolation circuits of most radio/computer interfaces. (That's just a guess about that 'isolator' thingy, I've never seen one.) Good luck. - 'Doc [/QUOTE]

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