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Enable HDMI Audio & Toggle Sound Output from Mac OS X Quickly
https://osxdaily.com/2013/05/04/use-hdmi-audio-output-mac-os-x/#:~:text=Hold%20down%20the%20Option%20key%20and%20click%20the,the%20Mac%20doesn%E2%80%99t%20support%20exporting%20audio%20over%20HDMI.
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
Connect to HDMI from your Mac - Apple Support
https://support.apple.com/en-us/HT204388
No sound through USB-C to HDMI adaptor on MacBook Air 2019
https://apple.stackexchange.com/questions/380891/no-sound-through-usb-c-to-hdmi-adaptor-on-macbook-air-2019
MacBook Air, Retina, 13-inch, 2019. Running Catalina 10.15.2. Using USB-C to HDMI adaptors, MacBook Air sound preference center cannot recognize the device it is plugged to (HDMI cable connects the adaptor to the TV monitor; sound on TV monitors has been tested; older MacBook Pro with HDMI output can output sound just fine); Video is fine.
Fix: HDMI Sound Not Working Mac - Appuals.com
https://appuals.com/fix-hdmi-sound-not-working-mac/
How to Enable Mac Volume Control for HDMI or …
https://lifehacker.com/how-to-enable-mac-volume-control-for-hdmi-or-displaypor-1793607216
Enable HDMI Audio & Toggle Sound Output from Mac OS X Quickly
https://osxdaily.com/2013/05/04/use-hdmi-audio-output-mac-os-x/
Hold down the Option key and click the Apple menu, then choose “System Information”. Select “Audio” from the Hardware menu. Click the triangles to open each audio channel option, and look for “HDMI Output”, “HDMI / DisplayPort Output”, or something similar.
Mini Displayport HDMI Audio on MacBook Air? - MacRumors
https://forums.macrumors.com/threads/mini-displayport-hdmi-audio-on-macbook-air.1036762/
I have spend an age on the help line asking if the new MacBook Air will play the audio through the TV to support the movies using an iwire HDMI cable. Eventually they told me no it wont. However, from System Preferences - Sound - Output (and made sure the HDMI was plugged in to the TV) it allowed me to toggle between the devices named.
Connect to HDMI from your Mac - Apple Support (CA)
https://support.apple.com/en-ca/HT204388
No Facetime audio on external speakers via HDMI on M1 ...
https://www.reddit.com/r/macbook/comments/k5ctyf/no_facetime_audio_on_external_speakers_via_hdmi/
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