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Audio passthrough on noise cancelling headphones

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shmokes:
Anybody know if the mic typically used for active noise cancellation in headphones can be used for the opposite? I'm interested in listening to audiobooks while riding my bike, but I'm afraid to limit my hearing too much. I'd like ambient noises to be passed from the microphones directly into my ears (in addition to the audiobooks). I'm also highly curious, if this is a feature, if anyone has tried it and whether it works well.

Nephasth:
Um... Don't use noise cancelling headphones.

shmokes:
Um . . . that post isn't at all useful.

Nephasth:
Yes, common sense is never useful.

shmokes:
Oh . . . we're on the common sense train. Then this seems applicable: All headphones are noise cancelling. Headphones sit on top of your ear canals and block ambient sound from entering, while also delivering sound from an audio device that drowns out ambient sound.

The point of using active noise cancelling cans is they have a microphone that would be capable of mitigating this effect by picking up ambient sounds and delivering them to your ear canals. In other words, don't be an ---uvula---.

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