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> You can't get non-wireless (/non-battery-powered) noise cancelling headphones. Go on, try and find some.

https://www.bose.com/p/headphones-aviation-headsets/bose-a30...

The six-pin LEMO connector carries both power and audio.

Aerospace headsets... yeah, helicopter headsets might be the one case where you actually can find cable-powered active noise cancelling. But you're a long way out of the consumer sector at that point...

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