Better software for DSD

Yes as an ISO file loaded into the Audirvana. Do you think Pure Music runs DSD files better or another program other than these two.

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?

Yes I'm using Audirvana plus.

I picked DSD over PCM Standard 1.0 as opposed to Automatic Detection. I don't see where you can pick DSD via DoP.