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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.
No sound over Mini DisplayPort to HDMI Ad ... - Apple
https://discussions.apple.com/thread/2639905
Be sure you are on the Sound Effects tab. Middle of the window select your TV where it says "Play sound effects through:". Select the middle tab named Output. Select your TV from the drop-down list next to HDMI, below where it says "Select a device for sound output". Using either Finder or Launchpad go to Applications > Utilities > Audio MIDI Setup.
Does mac mini output audio through mini display port ...
https://forums.macrumors.com/threads/does-mac-mini-output-audio-through-mini-display-port.1209229/
The 2009 Mini does not support audio over DP. The best option is the DP to HDMI cable, and running audio out the 3.5mm jack on the back. You should check to make sure your display has an HDMI port...
audio - Mini Display Port to HDMI - no sound - Ask Different
https://apple.stackexchange.com/questions/113447/mini-display-port-to-hdmi-no-sound
It's possible your Mac doesn't support audio over Mini Display Port: These Apple computers supply multichannel audio (up to 8 channels) and video signals over Mini DisplayPort: MacBook Pro (Retina, 13-inch, Late 2012 and later) 1 MacBook Pro (Retina, 15-inch, Early 2013) MacBook Pro (Retina, Mid 2012)1 Mac mini (Mid 2010 and later)1 Mac Pro (Mid 2010) MacBook (Mid …
Connect a display to Mac mini - Apple Support
https://support.apple.com/guide/mac-mini/connect-a-display-apd8e4fbbb97/mac
Connect a display to Mac mini The Thunderbolt 3 (USB-C) ports and the HDMI 2.0 port both support video output, so you can connect an external display, a projector, or an HDTV. For Mac mini with M1 chip, you can connect one external display up to 6K using a Thunderbolt 3 (USB-C) port, and one external display up to 4K using the HDMI 2.0 port.
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