Without going overboard - audphile1 has a solid suggestion. You might consider a new Schiit Miodi instead of the used Bifrost. It has a nice USB implementation that will isolate the DAC frrom your Mac.
Digital Advice
Looking to replace my Denon 2900 which is very old and having more problems.
Option #1DAC and Mac (I already own)
Option #2 Stand-alone Streamer DAC
For digital I play CD’s to the 2900.
Many but not all my CDs have been ripped to the Mac.
Goal is to stream music to HIFI system & play legacy CDs.
I stream Amazon Music HD, on my Mac and mobile devices.
My budget is $600.