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Mini DisplayPort - Wikipedia
https://en.wikipedia.org/wiki/Mini_DisplayPort#:~:text=While%20the%20DisplayPort%20specification%20can%20support%20digital%20audio%2C,USB%2C%20Firewire%2C%20or%20the%20audio%20line%20out%20port.
Does Mac Pro mini displayport carry audio? - Apple Community
https://discussions.apple.com/thread/4064712
Jun 28, 2012 10:16 PM in response to Jed1275In response to Jed1275. 5x70 cards (on 2010 mac pros and beyond) pass audio on their mini-displayports. I assume they will also on a 2009 mac pro. 2009 mac pro's with ATI Radeon HD 4870 or NVIDIA GeForce GT 120 I believe do not pass audio through the mDP. More Less.
Does the Mini DisplayPort on my Macbook Pro Carry …
https://www.sweetwater.com/insync/does-the-mini-displayport-on-my-macbook-pro-carry-audio-and-video/
A: The Mini DisplayPort spec does support audio and video transmission. However, audio is not implemented on all Macbook Pro models. In general, Macbook Pros made prior to mid 2010 do not carry audio on their Mini DisplayPort connection. Further information is available here, along with instructions on identifying the exact Macbook Pro you possess.
Mini Displayport to HDMI – does it carry sound ?? - Apple ...
https://creativecow.net/forums/thread/mini-displayport-to-hdmi-does-it-carry-sound-aea/
Actually, the mini displayport does carry sound. All I had to do to get it to work was enable the new monitor in the system prefs (audio/output). It was a breeze.
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.
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