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There are separate signals sent from the amplifier, one for the left driver, one for the right. If you look at a stereo headphone jack, you will see 3 zones on the silver or gold part. They are separated by 2 black insulators. They are the ground, left and right connections. iPod remote headphones have 4 conductors, one for the control or microphone and three for the sound.

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Q: How do earphones know which sounds to play in the left ear and which sounds to play in the right?
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