HT202638: Mac mini (Late 2012): External ports and connectors
Learn about Mac mini (Late 2012): External ports and connectors
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Helpful answers
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Feb 28, 2015 2:12 AM in response to fendercpkby lllaass,No. you have to unplug the headphones.
Why can't I select HDMI audio on my Mac mini?
If you connect an HDMI display or television to a Mac mini (Mid 2010 or later), you might not be able to select the HDMI audio device (in System Preferences > Sound > Output). This can happen if you also have headphones plugged in to the computer. Unplug the headphones to be able to select HDMI audio.
Mac computers: Frequently asked questions about using HDMI - Apple Support
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Feb 28, 2015 2:49 AM in response to fendercpkby woodmeister50,Plugging anything into the audio output jack disables all other audio.
I guess it is a carry over of the old days when the "headphone" outputs
were for private listening.
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Feb 28, 2015 6:11 AM in response to lllaassby fendercpk,OK, so I've now unplugged from the Headphone port and plugged the study speakers into a mini digital to analogue / analogue to digital converter that was originally purchased to connect a headset to the USB port. This gives two sound options in System Preferences: External SPDIF interface USB which appears to be the active option and Speaker USB which is muted when selected.
The only problem now is that I got a grey box appear on the screen showing a speaker and volume level. Selecting other speaker options did not get rid of it. It was not clickable (neither left not right click). No matter what I tried it was still obtrusive on the display.
After selecting HDMI and listening to an album in the lounge, I turned off the TV (that had been mirroring the Mac screen) just leaving the audio playing through the amp. When I returned to the Mac and selected alternative speaker options, the grey box disappeared and now selecting various speaker options does not cause it to return. Any ideas?