Just to update, I have been running Roon OS or Rock on 2011 MacMini for a while zero isses aside form in beginning it seemed to stop working. Since New Roon Os update its been flawless. My question is, under Roon it lists all the HDMI out options for Audio, however if I connect a USB dac it doesnt show up in Roon connected to the Mini. I was experimenting with another Dac and was trying it connected USB to Mini and not seen at all. I use a RPI based streamer with Digi hat SPDIF out typically and sometimes a USB dac also attacked that way. Just curious if anyone knows a work around.
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Thank you so much for the information.
I just moved Roon from my desktop computer to a dedicated Mac Mini 2012 with ROCK and everything worked right away 
By the way, I installed the ffmpeg CODEC do I need to fetch others?
Nope, all good if you installed it correctly
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I assume you had to use a USB Ethernet adapter with the Mini? I do, hoping a Rock update might fix that.
And ROCK has much less background processes nor GUI like macOS. Lightweight with less CPU and i/o activities to improve sound quality.
Is it faster?