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Either way, it always routes the sound output to the jack if something is plugged in (even if it's just a plug or splitter with nothing connected).
![wireless lavalier microphone for macbook air wireless lavalier microphone for macbook air](https://multimedia.bbycastatic.ca/multimedia/products/500x500/148/14826/14826583_4.jpg)
If the ITAH comes back negative, it keeps using the internal mic. If the "is this a headset?" (ITAH) check comes back positive, then the Macbook switches to the external mic. Some Macbooks just check to see if there is a microphone connected, while others check for the full headphones + microphone combination. It does this by testing the electrical properties of what you plugged in, to see if it looks like a headset.
![wireless lavalier microphone for macbook air wireless lavalier microphone for macbook air](https://www.dpreview.com/files/p/articles/2495755693/Header_still.jpeg)
So how does it do this? When you insert the plug, the Macbook checks to see what you inserted. But if you plug in a headset (with a mic), then it should route the sound output to the headset, and also use the headset mic for input instead of the internal microphone. If you plug in headphones (no mic), the Macbook should obviously route the sound output to the headphones instead of the internal speakers, but still keep using the internal microphone for input. Headphones do not have a mic, but headsets do have mics. You can plug in headphones or a headset, and it will just work. The Macbook tries to make things "just work".
#Wireless lavalier microphone for macbook air how to#
How to understand what your Macbook is doing: What I finally figured out is that the Macbook does not recognize the Rode Wireless Go as a microphone! Oddly enough, that was the key to getting it to work. I tried a lot of internet-suggested tricks but none of them worked. I have the Rode Wireless Go (plus the Rode Lav Go), and I like it, but I had a lot of trouble connecting it to my Macbook via the headset jack.