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When I plug my speakers into a headphone jack on my iPhone, is the output stereo or mono?

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The iPhone headphone jacks are 1/8" (3.5mm) stereo jacks. If you have a stereo cable plugged in, the output will be stereo.

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  • Interesting side-note, the external speakers on the iPhone are 'mono', and I believe only output the left channel..
    – notthetup
    Apr 23, 2011 at 17:49
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    @ntt On my iPhone, of the two holes on the bottom, the one on the right (if the screen is facing you) is a mono speaker and the one on the left is phone's primary microphone.
    – Kalamane
    Aug 26, 2011 at 16:10
  • Indeed.. But it takes the left channel of the audio to send to that mono speaker..
    – notthetup
    Aug 30, 2011 at 7:49

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