Middlebury

Connecting a Mac computer to a projector or TV or monitor using HDMI

For Mac models that have Mini DisplayPort/Thunderbolt, it is possible to use an HDMI adapter to connect to some of our newer classrooms and project a much higher quality image. However, not all computers that have Mini DisplayPort/Thunderbolt can send the audio over the same cable as video due to incomplete design by the manufacturer. Right now, we are aware of certain Mac computers that cannot output audio over the HDMI cable. Roughly, this includes Mac laptops made before Mid-2010. There is no definitive list of these computer models that do not support audio over the video cable. There is, however, a list of Mac computer models that do support both audio and video over the HDMI cable with the appropriate adapter.

Potential audio problems when connecting a Mac to a projector using HDMI

We have noticed that some combinations of Mac computer + HDMI adapter + classroom projection system may produce valid video projection but no audio. Dana Auditorium is one location where this may happen. Here are some steps to remedy this:

  1. Ensure that you have firmly connected the HDMI cable to the appropriate HDMI adapter and that the adapter is firmly connected to your Mac computer.
  2. Click on the Apple logo in the top left corner of the screen and click System Preferences.
  3. In the System Preferences window, click Sound and under the Output tab, select the HDMI option. This should produce both audio and video projection.
    If there is still no audio, follow the next steps, as well.
  4. Click on the search button in the top right corner of the screen and type Audio MIDI Setup. In the list of search results, click on the Audio MIDI Setup application.
  5. In the Audio MIDI Setup application, click on the HDMI option in the list of devices on the left. In the right-hand portion of the screen, ensure that Format is set to 48000 Hz and 2-ch 24bit. The settings take effect immediately - just close the MIDI setup application.
  6. Contact the Helpdesk if the above steps did not help.
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