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This question already has an answer here:

MacBook Pro Retinas dropped the line-in (microphone) jack that previous MacBook Pros had. Sometimes I want to plug in a 1/8" microphone, but there's no option to switch the input from "internal microphone" to "line in".

Sound Preference Pane

Is there a way through the command line or 3rd party utility to reverse the direction of the headphone jack to use it as a line in for a microphone?

marked as duplicate by Tetsujin, fsb, Allan, grg osx Oct 6 '16 at 15:26

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  • That would not work. Line in requires that the microphone has a power source. Headset do not. – Ruskes Jun 26 '15 at 0:04
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    @Buscar웃, you only need phantom power if trying to connected directly to a condenser microphone. Line input and dynamic mikes don't require power. – Joshua Mar 10 '16 at 21:31
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    This question has some pretty thorough responses to the same problem: apple.stackexchange.com/questions/90344/… – LordParsley Oct 6 '16 at 14:28
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For those Macs with a single shared input/output jack, the key to using a microphone is to have the correct plug. I'm guessing your're not seeing the input options because your microphone jack doesn't have three rings on it (Apple headsets with microphone have three rings)? If that's the case, you'll need to get a splitter cable so that the Mac realises that a microphone is available. See here for more information.

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    I am using a TRRS plug (4 poles, standard CTIA) and the microphone isn't working. Sound settings do not allow the option to use the 3.5 port for audio input. When plugging the same thing into a phone, everything works just fine. So, I have to assume Apple just didn't bother to wire it properly. – Asu Jan 16 at 17:34

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