Mac Stereo Mix Headphones HDMI

To send stereo mix audio from your Mac to headphones and HDMI devices simultaneously, follow these steps:

1. Audio MIDI Setup:
   • Launch the Audio MIDI Setup app (located in Applications/Utilities).
   • Create a Multi-Output Device by clicking the plus (+) button at the lower left of the Audio Devices window and selecting “Create Multi-Output Device”.
   • Right-click (or Ctrl-click) the Multi-Output Device and select “Use This Device For Sound Output”.
2. Select Audio Devices:
   • In the Audio Device list, tick the sets of headphones you want to use (wired or Bluetooth).
   • For HDMI, select the HDMI device (e.g., TV or projector) as an output device.
3. Configure Drift Correction:
   • Tick “Drift Correction” for the secondary device (headphones) in the Audio Device list.
4. System Settings:
   • Launch System Settings (select ⌘ + Shift + > from the menu bar).
   • Select Sound in the side column.
   • Under “Output & Input,” click the Output tab and choose the Multi-Output Device or “Aggregate device” in the list.

This setup will allow you to send stereo mix audio from your Mac to both your headphones and HDMI devices simultaneously. Note that you may need to adjust the audio settings in your Mac’s System Preferences or the HDMI device’s settings to optimize the audio output.