KeythKatz t1_j6lczdk wrote
Reply to comment by Likes_The_Scotch in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
Some are even 3-pin, where I believe the third pin is for power delivery for active noise cancellation. Then there's a level on top of that with metallic contacts between the pins, no idea what those are used for.
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