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Connect to HDMI from your Mac - Apple Support
https://support.apple.com/en-us/HT204388#:~:text=Choose%20Apple%20menu%20%3E%20System%20Preferences%2C%20then%20click,your%20Mac%20can%20send%20audio%20over%20Mini%20DisplayPort.
Mac Mini Audio Out over Mini-DP - Apple Community
https://discussions.apple.com/thread/7934040
Using either Finder or Launchpad go to Applications > Utilities > Audio MIDI Setup. On the left-hand side of the window you should now see HDMI. In the middle of the window, on the Output tab, where it says "Source:" select your TV from the drop-down list.
How to Enable Mac Volume Control for HDMI or …
https://lifehacker.com/how-to-enable-mac-volume-control-for-hdmi-or-displaypor-1793607216
Click the SoundflowerBed icon in the menubar and select either DisplayPort or HDMI as you output. Click the speaker icon in the menubar and select Soundflower. You can also go to System Preferences...
Can or will Apple enable audio via mini displayport ...
https://forums.macrumors.com/threads/can-or-will-apple-enable-audio-via-mini-displayport.742755/
Apple I doubt Apple will do it but Monoprice is working on it. Their device is a Mini-Displayport + USB audio >>>> to HDMI 6 feet long My guess is that this will Mac compatible since Apple is the only company shipping products with Mini Display ports (besides the companies making adaptors.)
Connect to HDMI from your Mac - Apple Support
https://support.apple.com/en-us/HT204388
If your HDMI device isn't receiving audio from your Mac: Choose Apple menu > System Preferences, then click Sound. In the Output pane, make sure that your HDMI device is selected. If you're connecting using a Mini DisplayPort adapter, make sure that your Mac can send audio over Mini DisplayPort.
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