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Mac Mini Audio Out over Mini-DP - Apple Community
https://discussions.apple.com/thread/7934040
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/
Aug 9, 2011. #6. DisplayPort technology does support audio traffic as well as video. The 2009 models have some problem (I suspect EFI related) that doesn't push audio over the DP. My 2010 MBP...
Does this Mini DisplayPort to HDMI connector output audio?
https://apple.stackexchange.com/questions/33620/does-this-mini-displayport-to-hdmi-connector-output-audio
Only certain Macs can output audio through the mini display port. Those that can't will need to have auxiliary speakers connected to the 3.5mm audio jack or other solution through a separate cable system. Mid 2010 or later MacBook Pros support audio through the port. Late 2009 or later iMacs also support it.
Identify the ports on your Mac - Apple Support
https://support.apple.com/en-us/HT201736
Thunderbolt and Thunderbolt 2 are not the same as Mini DisplayPort. They have the same shape, but use different symbols on the cable and port. However, this port does support Mini DisplayPort for video output, so you can use a Mini DisplayPort cable to connect a Mini DisplayPort display.
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