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Stereo headset jacks to mono radio input (ICOM220)

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Is there anything else going to the headphones? Stereo CD music, intercom, other radios, warning tones, ...?
If the answer is no, just the one radio, then connect everything (option 3) together.
 
The radio has three audio inputs so in my case the GTN625, GDU470 and one undecided will be inputs.

But these will go thru the radio, nothing is planned to be connected directly to the headset. (In the future I might install a dedicated audio panel but then this wiring will be redone anyway)

:)

Doesn't the headset have a mono/stereo switch on it?

If it does, it takes care of both ears hearing the same thing...:)
 
If the headset doesn't have the s/m (!?) switch, you can just install stereo phone jacks and tie tip & ring together. Do not forget you did that, if you ever install a stereo intercom or audio panel.
 
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