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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.
Identify the ports on your Mac - Apple Support
https://support.apple.com/en-us/HT201736
Mac mini introduced in 2009 and 2010 iMac introduced in 2009 and 2010 Mac Pro introduced in 2009 through 2012 Use this port with displays that connect using a Mini DisplayPort cable. Mini DisplayPort is not the same as Thunderbolt or Thunderbolt 2 . They have the same shape, but use different symbols on the cable and port. FireWire FireWire 400
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.
Question: Q: Mac Mini MC238LL/A mini-display port audio ...
https://discussions.apple.com/thread/3064426
When the model was released in Late 2009 the mini-DisplayPort did not support audio. In 2010, after the first MacBooks Pro were introduced supporting audio over m-DP folks were reporting that new Mac minis made after that did support audio over m-DP. So the answer depends on the date a particular Mac mini of that model was manufactured.
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...
Amazon.com: Dr. Bott Audio & Mini DisplayPort to HDMI ...
https://www.amazon.com/Dr-Bott-Audio-DisplayPort-Adapter/dp/B0033SEB2O
You need this product if you have a mid-2009 or earlier Mac Mini and want to connect to an HDMI display device, such as a flat-screen TV. FOr the 2010 or later Mac Mini, you can use the slightly cheaper Moshi or Apple mini displayport to HDMI adapter, since the the audio is present on the displayport on later/current Mac models. Helpful
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