mac mini into a hires streamer

I would like my Mac mini to out put hires to my new dac, the Nuprime DAC-9 and don't know ho to do it. I did a few years ago have my mac upgraded/optimized for cd playback 16/48 and it won't output any higher and was old by someone that it depends on my MAC OS? The end goal is to do this so I can try the different resolutions on Amazon Prime HD.

THX in advanced,

I don’t know the specs on your Mac but I had to retire my old MacMini since it wouldn’t update the software Tidal required. Mac output via optical is capped at 48 but USB is not. Once I upgraded to a new Mini and used a good USB cable all was good. I hope this helps. Listing the rest of your system would help get the right answers to your question. 
If you have hi res audio files you can go from USB into the usb input on your dac.  I do this with an old macbook.  No problem streaming hi res audio off the internet or playing hi res files ripped from CD's