Different adaptors are for use on varying sound systems fitted to various aircraft. Boeing will be different to Airbus etc. There may also be differences between older and later models of the same make. On some the head phones will plug straight in to the outlet in the seat, on others an adaptor will be needed. Some headphones will have a single pin with four contact points to give L/R and return for channels. Some may have a single pin with three contact points L/R and common return. Some will have two pins that give a power and return for each channel. Pretty simple really. Your computer outlets look like red needs a single four contact pin for headphones and green is mike. But don't hold me to that. Usually red and blue for L/R and green is usually the microphone input.
 
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Your computer outlets look like red needs a single four contact pin for headphones and green is mike. But don't hold me to that. Usually red and blue for L/R and green is usually the microphone input.

I'm not at all sure this is right. Usually, on a computer, red is for the microphone input and blue or green is for headphones. I think the blurred logo near the red socket is meant to represent a microphone.
In my experience, 4 contact jacks usually use 2 or 3 for mono or stereo audio and the other contact for some sort of switching.
 
I'm not at all sure this is right. Usually, on a computer, red is for the microphone input and blue or green is for headphones. I think the blurred logo near the red socket is meant to represent a microphone.
In my experience, 4 contact jacks usually use 2 or 3 for mono or stereo audio and the other contact for some sort of switching.

You may well be correct. But dedicated headphones are available for computers. Dopes is a tight arse obviously. ;):D
 

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