How to Fix A USB Microphone Not Working On A Mac

Mac OS is relatively closed system, which means you do not have the access to do much about programming, not even the simplest self troubleshoot in some cases. But if there is still anything than we can do about it: A USB microphone doesn’t work on your Mac?
 
A few tips on the physical connection for your reference.    

1. 1.If you have many devices connected to your Mac: Disconnect all USB devices except the device you’re testing.
2. 2.If the mic is connected to a USB hub that does not have a power cable, pleases plug the mic directly into your computer’s USB port.
3. 3.If your computer has more than one USB port, switch the mic to another port.
4. 4.If you still cannot use the mic, shut down the computer and unplug it from the power outlet. Wait about a minute, then plug it back into the power outlet and start up your computer.

 
After all these hard work, chances are that the mic is still not seen by your Mac. Then you can go ahead to do something about the system setting. Check the microphone permissions: Head to System Preferences > Security and Privacy > Privacy, and select “Microphone” from the sidebar. You should see a list of apps that have requested access to your microphone and make sure you tick a checkmark next to all the apps that you need to use with your mic.
 
Hopefully the mic is recognized by the computer now. But if the situation did not get any improved: You still not hear any sound coming out of your Mac, then more troubleshooting should be done.
 
First off, under sound setting of Mac OS system, make sure the microphone is the default input while the built-in speaker of Mac is the default out. Next, turn up the input volume and talk to the mic, see if there is any response in the input level.
 
If not, you have to enable the dictation feature of your Mac. But it is a wild card, which does not necessarily work in your case, but is definitely worth a shot. Head to System Preferences > Keyboard, and then click the “Dictation” tab. Click the “On” radio button and wait for any downloads to complete. Make sure the microphone you want to use is selected in the drop-down menu. Luckily this time you should see the levels moving.
 
At last, click open the app QuickTime player on your Mac to hear microphone sound coming out of the laptop’s internal speaker. You also have to choose the USB mic as default device in the drop-down menu of the apps and drag the progress bar to the right side. And this all, you should be able to hear audio by now.