99% of my Phasure NOS1 (now "a") usage has been under Mac OSX. Peter did try the Audirvana+ player at one point, so he has recommended filter settings for that player if using the NOS1. I tried to get HQplayer working but ran into an error after install that I couldn't understand or solve, so I gave up.
It gets worse. Most of my music is played over Spotify with OSX up sampling to 384K. Look under the AudiiMIDI utility for this. This is a capability that Peter actually reminded me of, since I'd forgotten about it It's not because Spotify is ideal for SQ, but simply because it's a very easy way to hear new music.
Interesting regarding Peters recent comment that low-power computers may be ideal because mains noise can still affect sound. The Mac Mini is designed to use much less than a typical PC. Apple seems to prioritize this during development since it's always part of their marketing spiel. The later models especially so, although I still need to hook up my wattage meter to see what my 2012 Mini consumes.
I've never felt OSX wasn't supported, but the NOS1 was designed for XXHE so that's where most of the discussion is. No much to discuss on the Mac side, once you have your AudioMIDI and Audirvana+ settings correct. It makes sound, better than my Benchmark DAC2 incidentally, but not as good as it can be under XXHE.
I put Windows on the Mac too, so I can use XXHE on it. Easy to boot into that, but I'm a creature of habit and my personal music collection is only a tiny fraction of what Peter has. Plus I still have the XXHE PC.
When I get some new speakers (Geddes), I'll do more comparing. I haven't felt comfortable doing comparisons so far, since every speaker so far (at least 7 over the past year) has had some serious flaw. Learned a lot, at least..
Enough blah blah, as Peter would say