Just hooked up my iMac, running Snow Leopard, for use with the new spouse-friendly NAD/HRT Streamer II/PSB system I have previously mentioned. Did it via 100 megabit ethernet, figuring it would be a little more stable than using wi-fi (and more consistent with Jim Smith recommends).
Played a few tracks with Audirvana (it had worked well previously with my MacBook via wi-fi, and I am very much an open source supporter) but in the softer passages I heard clicks or ticks similar to, but a bit different than, something you might get on vinyl playback. Went to try the same music (all 16/44) with Decibel and Fidelia, but my trials for both of those seem to have expired. The only other things on that machine were Vox and VLC – neither of which displayed the clicking behavior (although, to my amateur and elderly ear, the overall musical experience seemed much less lively, discounting the extraneous noise).
So I am going to investigate whether there are some configuration settings I am overlooking in Audirvana that might be relevant, and will start scouring Audirvana's site, CA and perhaps other blogs/forums for some clues. Until I get my now-in-flux speaker placement/listening position squared away, I will probably don headphones for this round of troubleshooting. Any suggestions would be welcome!