Originally Posted by
ShortDog
The light on my B&O headphones didn't work, and the on/off switch seemed reversed. When I switched it off, the noise cancelling stopped. I would have expected the opposite.
I posted this above, but this is consistent across the 3 pin B&O - my speculation is the "on" toggles battery mode for normal B&O headphones; as these do not have batteries it just doesn't work. "Off" works as the power is coming from the 3rd pin on the aircraft.