pedroah t1_j6l14ia wrote
Reply to comment by tomNJUSA in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
Aka it works like your doc's stethoscope
The two pin electric earphone jack might be a carry over from this two hole air tube system. I've seen this air tube setup even in the early 2000s.
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