Is there an audio-in on 15inch Macbook Pro Retina ?

After an hour or so of experimenting, I discovered Apple's intent for the use of their Headphone/Microphone port on the 15 inch MacBook Pro Retina (late 2013). Whereas almost any headphone plugged in will read as a headphone and serve as an output jack, only a specifically connected and wired microphone/headphone combo will signal the hardware that a microphone is connected for external use. You can see this most easily by inserting your iPhone headset which includes the inline microphone as a part of the cord into the headphone jack and observing the Audio Output setting changing from Internal Microphone to External Microphone. Then, of course, your headset mic is the external microphone. The iPhone headset 3.5 mm plug has a 3 banded sleeve vs. the typical 2 bands on a stereo plug. I found I could also use a 2 banded sleeve found on computer combo headset/mic having two separate plugs - one for headset and the other for microphone - if I only plug in the microphone plug just shy of fully inserted. Not an ideal situation but this works if you have no other way and want to avoid using the internal mic in the computer.

My intentions, probably not unlike most who are viewing this question, was to use a better than telephone quality mic for use in professional voice work. Apple engineers took away a mic input port and did not replace it with an equal. The only apparent workaround is USB which requires another purchase.

The Mac once was a multimedia machine... it´s getting worse every now and then...sad

From the Apple website, technical specifications page on Retina units:

MacBook Pro specifications

http://www.apple.com/macbook-pro/specs/

Best.

Read this thread: https://discussions.apple.com/thread/4555847

The thread I indicated did not suggest a double-use of the headphone jack. It suggested a USB-microphone.

I know nothing more.

I think you need a USB microphone. It is the compromise you make for the Retina display.

Good luck.

I was mislead too.

I was planning to use it for Software Defined Radio with I/Q signal going to the two mic inputs,

but my laptop does not have these two inputs.

The official Apple website shows 2 Mic Inputs in the specs of the 15" Macbook Pro w Retina Display.

Jean-Paul

I just discovered when i plugged my earphones in that the Mic on my Belkin

Headphone Adapter with Microphone

was working perfectly so i guess it's just a matter of using the right plug.

(This is a mono mic and the volumebuttons on the li'l device works aswell, cool.)

"The official Apple website shows 2 Mic Inputs in the specs of the 15" Macbook Pro w Retina Display."

Please post a link to that.

http://www.apple.com/macbook-pro/specs-retina/

In the chapter called "Connections and Expansion" about middle of document, it says "Dual MIC" with two small circles that are not in my Macbook.

I have the latest 15" pro w Retina. (bought it in November)