By default, Voice Control will use your Mac's built-in microphone. Help! I'm trying to get my Logitech USB Desktop Microphone to work with my Mac Mini.This will open your settings in a new window. The external mic function on my 15' MacBook Pro (Catalina V10.The mic input doesn't have enough power to run a regular microphone which is why it doesn't work, for the Mac Mini a lot of people suggest using the iMic ( apples ) or any USB style Microphone because the USB ports will provide sufficient power to the device.I've plugged in an external mic to the line-in and it does not work. The SteelSeries FAQ says I need a USB sound card to use the microphone with a Mac. Have tried connecting via the included cable, as well as USB-C to USB-C. I've got a user who is trying to make calls using skype for business on a MacBook but when they do, the mic doesn't seem to be working.