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Macbook Air M1 dropped sound through HDMI - Apple Community
https://discussions.apple.com/thread/252454862
To start, we ask that you go into System Preferences, then click Sound. In the Output pane, deselect HDMI. Once done, let's go ahead and restart your MacBook Air. After you've restarted your MacBook Air, go back into System Preference > Sound and select the HDMI option: Connect to HDMI from your Mac
No Audio through USB-C to HDMI on 2018 Ma… - Apple Community
https://discussions.apple.com/thread/250240027
Hmm.... go to: Applications > Utilities > open Audio MIDI Setup and see if the device is listed...? If it is not, click the + (bottom left corner) and try creating a new audio device. It also might help, to look at the Audio MIDI Setup of a working Mac. Then if that does not fix the mutants, try blasting their NVRAM.
Listen to Music and Your Surroundings with Audio Monitor ...
https://notebooks.com/2011/03/22/listen-to-music-and-your-surroundings-w-audio-monitor-pass-thru-on-mac/
If you want to listen to your music loud, but don’t want to completely tune out your surroundings, you need to get Audio Monitor for Mac. This handy application passes audio from the Mac’s internal microphone through your headphones so that you can hear other people or events around you. This application will work great on your MacBook, MacBook Pro, MacBook …
display - Route (MacBook Air) audio output through (Dell ...
https://apple.stackexchange.com/questions/217115/route-macbook-air-audio-output-through-dell-lcd-monitor-speakers
Meaning if you plug in a source that supports audio (in its particular case, HDMI) then you can pass that audio out to a set of desktop speakers. But it doesn't have any built in. If it is indeed an input, you just need a 3.5mm to 3.5mm audio cable, and connect the headphone output of your MacBook to the speaker input on the monitor.
Amazon.com: macbook air audio input
https://www.amazon.com/macbook-air-audio-input/s?k=macbook+air+audio+input
USB C Hub Type C Multiport Adapter for MacBook Pro/Air, 10 in 1 Mac Dongle with HDMI, Ethernet, VGA, PD Port, 3 USB 3.0, SD/TF Card Reader and Mic/Audio for Windows Type C Laptops 4.4 out of 5 stars 188
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