I would check the bitrate settings in the Mac under Audio Midi Setup App (use spotlight to find it) and check its not able to see the DAC at higher than 16/44.1
It could be a limitation of the Marantz to work at hight rates without a Windows OS and specific Marantz Driver too.
Are you able to use other apps to output 96KHz content to the DAC? I did notice that there are drivers available for Windows but no drivers for OSX, I too am wondering if this is a driver limitation for specific platforms.
What kind of USB drives are available for that DAC, is the behavior the same for both WASAPI and ASIO? Can you share a screenshot of your Roon Settings -> Audio Tab? It should look something like this:
What does the Signal Path look like…please post a screen shot playing higher rates that don’t don’t work. You can click the small coloured icon to the right of the paying track details.
Are these tracks from your own rips or tidal? Is it all at that bit rate or just some? What about dsd or higher flac rates?
Yes, you are correct here, OSX uses CoreAudio and not WASAPI/ASIO. Can you share a screenshot of your Signal Path as @wizardofoz suggested for both 44.1 and 96Khz content?
As for testing the drivers, you can use a few 96Khz tracks from the 2L test bench (http://www.2l.no/hires/index.html) to see if they play as expected when using iTunes to output to the DAC. That will give us a good data point. Is there any difference in between trying to stream 96Khz via TIDAL vs local library 96Khz? Does one work but not the other?
Also, I’d like to take a look at the diagnostics when you try to play 96Khz content, can you please reproduce the issue in Roon and note the exact local time and date in your country of when you try to start playback (e.g. 12:13AM on 4/26/19).
I begin this email in order to give you all the information requested. And I did it but when I tried to reproduce the error I’'ve got the other day I could’t because it worked!
I really don’t know what happened once I didn’t charge anything – DAC or Roon!
Anyway I would like to apologise and thank you guys for your time and kindness trying to help me on this matter.
Best Regards
I could play DSD 5.6MHz/1bit downloaded from Blue Coast Music. The signal path screen is attached below.
Thanks for letting me know that the issue is resolved.
I have marked this thread as [Solved] but if you have issues in the future don’t hesitate to reach out!