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Playing Mac Sound Over Classroom Speakers

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Is your Mac connected with HDMI in the classroom no longer playing sound over the room speakers? Recently, Macs began not switching to the room speakers automatically when plugged in with HDMI.  

Solution: Switch Sound Output

Step 1: Go to your Apple menu in the upper left of your screen.

Steps 1 and 2

Step 2: Choose System Settings.

Step 3: Choose Sound.

Steps 3 and 4

Step 4: Under the Output menu, switch from your Mac speakers to the room speakers. These probably start with a DVX, Divx, or Extron in the menu. 

Step 5: Macs connected to the Cynap wirelessly with Screen Sharing (AirPlay) should work fine when playing sound.