You're listening to music off of a Mac Mini. Invest in a dedicated streamer, that'll make more of an audible difference than fussing over DACs. Even a Wiim Pro with LPS (linear power supply) will beat the mac mini. A bit better, Limetree Bridge II or something, tiny German made machine and with an MCRU LPS it sounds like a much more expensive piece of gear.
Then you can up your DAC game later.