Originally Posted by
cundall
No, one prong if for left, one for right and i am guessing the other for power for the noise cancellation
Normal earphones will only get one side of audio / unless you use an adapter
This is not correct
Recent flights on A350, A380 and B787 a single 3,5mm phono jack plugged into either socket had sound in both headphones, it may not have been stereo but it sounded fine.