I have the same issue, with different equipment, but also with a Mac. I thought the problem here is with Mac OS X not being able to output DSD?
• Roon Core on Mac Pro
• Roon on Macbook Pro
• DAC: Nagra Tube DAC
MacBook Pro is connected to the Nagra DAC via USB.
Anything above DSD64 gets converted to PCM and the DAC sees DSD but 1 level of quality less (e.g., DSD256 is seen as DSD128 by the DAC).
I thought the reason for this is in OS X’s limitations on what it can output over USB? Is that wrong and can it be made to output bit perfect?