I have not had that problem with Audirvana/MacMini.
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Your DAC doesn't support DSD natively
You need to set Audirvana Plus to convert DSD to PCM.
I take it you have A+ and not the free Audirvana - which I recall does not handle DSD in any form.
Audio System tab
Under DSD Detection, set to None: Convert to PCM
Select Max Sample Rate to 192kHz - the maximum your DAC can handle.
See if that helps.
How are you playing the DSD files?
As an ISO loaded into Audirvana Plus' playlist window?
If you are adding DSF to iTunes using a shortcut type method which makes the DSF file appear as an M4A, A+ has changed their alias method. In the older versions, it would play the same shortcuts created by Pure Music (.M4A) but this was changed to a new method in later versions. I gather this was because Pure Music sought an injunction and forced them to change the method. Shame really, I was using PM to make the DSF alias M4A files and using A+ to play them for the longest time.
I have the Romulus Signature and have no issues playing DSD files from JRiver or Audirvana via the dac's USB input. Make sure you select bitstreaming DSD in JRiver, and delivery of DSD via DoP in Audirvana.
However, I have not been able to get DSD files to play via any of the spdif inputs (of course via DoP); I'm not sure if the problem is with the DAC or my Audiobyte Hydra X usb converter.
Most DACs only support DOP on the USB input so it won't work over SPDIF. I think the PS Audio DS DAC might be one of the few to allow it.
I actually am not a fan of Pure Music anymore. Not when they charged 50 bucks for a bug fix to v2.0
A+ is still my preferred player. I am curious tho you always mention Audirvana. You do have Audirvana PLUS right?