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Here, it says how to use the audio jack as in input. On my MacBook Pro 13" (mid 2012), It doesn't seem to have the option in settings. Is it not possible with these computers?

sound input preferences

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it is plugged in !! –  Skyler 440 May 2 '13 at 21:22
    
It is not, since our system does not recognize it and thus does not display the option for it. Do you have another mic, one with power source build in. –  Buscar웃 May 2 '13 at 21:52
    
Perhaps @Buscar웃 was trying to ask you to describe what you have plugged into your Audio in port. Is it a male to male metal stereo TRS jack or perhaps a mono jack or even a TOSlink optical jack? We can presume you have more details about your setup, but as written, we can only guess what your real problem is. –  bmike May 4 '13 at 18:51
    
I had a mono Mic plugged in –  Skyler 440 May 5 '13 at 13:24
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5 Answers 5

up vote 11 down vote accepted

Actually it is possible to use external microphone on MacBook pro and Air 2012 Models.

It looks like Apple has redesigned it to be a multifunction plug, without telling us in plain English. What they do say is you can use the Apple iPhone headset with microphone! Now that is a Hint !

enter image description here

Since there are multiple options to connect a microphone lets take a look.

1 - For stand alone microphone with cable you could use a USB connector type or Audio to USB converter.

2- You could use a BlueTooth type microphone/Headset.

3 - And last not least, you could actually use your Headphone (as marked) the 1/8 inch plug, but NOT with standard audio plug.

Here is the how: The plug is like the headphone port on iOS devices, this jack supports audio input as well as output—with as described in Apple specification.

Looking under the hood of Apple "About this Mac" you get the answer (it says it does support it).

enter image description here

The microphone or headset in question must be of the three-ring variety, just like Apple’s headsets. The fourth pin (ring) is for the microphone !

enter image description here

OK, what now? Lets assume you insist on using your microphone!!!

Get the 3.5mm 4 Position to 2x 3 Position 3.5mm Headset Splitter Adapter - M/F

enter image description here

... this headset splitter adapter breaks the audio port out into two distinct ports - one that can be used for a microphone input connection, and the other for connecting external (output) speakers.

I found stores in Europe (for about €10), but sure you can find it where you are.

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Now that's what I call hitting it out of the ball park! Not only will this help the asker determine what might be going wrong, but others can surely learn how the hardware is designed. –  bmike May 6 '13 at 13:18
    
Splendid answer! Thanks @Buscar –  P i Aug 18 '13 at 20:41
    
@Pi ..thanks for the Vote Up in supporting my work. –  Buscar웃 Aug 18 '13 at 20:50
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Yes, it seems the option is missing from your settings: this is what that preference panel looks like on my machine (13-inch, Mid 2009) (with nothing plugged into the audio port):

Sound Input pref pane

Unfortunately it looks like audio input isn't implemented on your model :(

The tech specs for MacBook Pro (13-inch and 15-inch, Mid 2012) have the following for the 13-inch:

  • Headphone port
    • Support for Apple iPhone headset with remote and microphone
    • Support for audio line out (digital/analog)

... it doesn't mention audio line in (which it does for the 15-inch).

Sorry for the bad news. One workaround is to buy an audio input device which plugs into USB.

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It does mention the Apple iPhone with microphone !! so it is possible –  Buscar웃 May 5 '13 at 21:21
    
@Buscar웃 Oh yes! Thanks for explaining in your answer... I have played with the same feature on iPad using an iRig, but hadn't quite connected the dots to realise that was possible on a Mac too. –  Ashley May 6 '13 at 9:42
    
you are welcome. –  Buscar웃 May 6 '13 at 12:51
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I post my solution hoping it can help someone.

I've have a MBP mid-12 13in, with the so-problematic unique audio jack. I'me sure that external&internal usage is possible because of the iphone headset test.

So I bought the TRRS cable, and my first tests fails: I got an external audio detected, but no luck with the internal line.

Then, I found an amazon comment about the cable, solved:

  • First, connect your external and internal lines to the Y cable
  • Second, connect the Y cable to the MB
  • It should take a couple of seconds to be recognised as an external mic

When I trying it fails again. But I've found the trick:

  • The internal line must be a microphone
  • So after being detected by the MB as an external mic, you can unplug the mic and connect anything else (an iphone)
  • Note: I've can only testing with a cheap non-powered computer mic
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The Griffin iMic is probably the most commonly touted solution for this "new" problem. This way you can monitor through the headphone jack, and the USB headphone jack also....I would assume. Maybe it's one or the other, however.

Either way the digital solution may improve signal quality also. There are other cheaper versions of the iMic but it seems Griffin was like "Hey Apple, want to make a computer that's missing stuff so we can make some more money?"

http://store.griffintechnology.com/catalog/product/view/id/623/?gclid=CLKDicGj1b0CFQaTfgodJqUAVA

If the link breaks just look up griffin iMic. It appears B&H currently sells it for $23.78

I've also seen similar products via https://www.google.com/#q=usb+to+3.5mm

I hope this helps with the "no line-in" problem on the 13" MacBooks and the new 27" iMacs. As well as the "My line-in doesn't recognize my mic" problem.

Alternatively try that 3.5mm 4 Position to 2x 3 Position 3.5mm Headset Splitter Adapter - M/F that Buscar mentioned above.

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Try removing the soundflower driver.

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

    
please explain what that will do. –  Buscar웃 May 5 '13 at 20:43
    
soundflower is a third party audio driver, it may be disabling the audio port's ability to receive input. –  zac May 5 '13 at 20:46
    
and why would Apple do that ? –  Buscar웃 May 5 '13 at 20:55
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Apple did not, sunflower is a driver for a USB audio device. This would have been installed after the initial OS install. –  zac May 5 '13 at 21:19
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I re-read Ashley's response and I don't see what you are referencing. Ashley's screen shot is showing the expected results of looking at the Sound preference pane with the drop down menu for switching between using the port for input/output and there is no sound flower driver. –  zac May 5 '13 at 21:36
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