AUX has to send electricity down the wire to drive the speakers in headphones. T... | Hacker News

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		WillPostForFood on Oct 4, 2017 \| parent \| context \| favorite \| on: Google Pixel 2 and 2 XL announced AUX has to send electricity down the wire to drive the speakers in headphones. The Quora article you link to is weirdly written but confirms this, "the signal is from your phone and your phone uses it's battery to make it." I.e., headphones work by taking electricity from your phone and converting it to sound.

criddell on Oct 4, 2017 [–]

The Quora article also mentions car audio. In a car, Bluetooth uses more power than a 3.5 mm cable plugged into an AUX port on the head unit.

WillPostForFood on Oct 4, 2017 | [–]

Yes, it is saying the car uses more power for the bluetooth connection, than receiving the AUX in from the phone. Not that the phone uses less power.

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