Mac Mini 2009 2.53 Intel Core Duo running Yosemite 10.10.5 8GB RAM 250GB SSD
Music stored on a Thecus N5550 NAS > AirPort Extreme > Mac Mini > Playback Designs MPD-3 DAC (DSD128-capable, 352.8kHz PCM-capable)
If I play a DSD64 or DSD128 track immediately after starting Roon, then try to play a PCM track, the track sits at 0.0 seconds for a second or two and then the triangle Play button grays out and nothing further happens – no music. I can select another DSD file and the file plays normally.
If instead I play a PCM file immediately after starting Roon, it plays normally but when I try to play a DSD file the track sits at 0.0 seconds, then the triangle Play button grays out and nothing further happens – no music.
This occurs whether I have my Mac Mini connected via USB directly to my DAC, or if I use the following path:
NAS and Mini > AirPort Extreme > Sonore microRendu > DAC
If I instead use an Surender N100H streamer via USB into the DAC, the Aurender and DAC negotiate sample rate changes and DSD or PCM and back fine, so I do not believe it is the DAC.