This is interesting in that I thought by using Audirvana strictly as a server, and streaming these tracks to a Raspberry Pi running Moode's UPnP Renderer, that the macOS DoP limitation to DSD128 would be circumvented.There is a "gotcha" for us Mac owners whose DACs only go up to DSD256 though. Mac uses DoP and the max I can do is DSD128 in this regard. Which still sounds great.
So what about my DSD256 files that I just downloaded ? Trying to playback has Audirvana breaking it down to PCM 352.8 if memory serves. And where Audirvana allows you to upsample PCM files to DSD, it does not allow converting DSD256 to 128.
Evidently only the iFi iDAC2, running the 5.2 Limoncello firmware version. It can do DSD256 over DoP (meets the 768kHz PCM requirement).Do you have a dac that does PCM768 / DSD512 ? I did some skimming and that may allow the overhead to permit DSD256 over DoP.
Thanks, yes that would be interesting to see, if you can get setup on the Mac without too much time and trouble. The Khadas DAC won't actually be able to confirm as it lacks a display, however the Pro iDSD will tell you what it is receiving with its front panel display.Let me see if I can set up a roon core on my mac and hook up to either of the DACs mentioned above.
@MikeyFresh I set up the roon core on a 2015 MacBook pro.
When the iFi Pro iDSD DA is connected to the Mac directly the DSD can no longer be "Native and needs set to DSD over PCM (DoP). The following is the signal path and the DAC shows 11.2 MHz.
View attachment 28790
Let me know if this helps or if you need me to try something else if I can help verify.
1. The solution described above for 64FS DSD can easily be extended for 128FS by simply
raising the underlying PCM sample rate from 176.4kHz to 352.8kHz. All the marker bytes
and bit ordering remain the same.
Speaking from a position of "having seen things on the internet", I think it is DACs that can't manage more than 352.8 khz which is the stumbling block. I think DSD256 to be transported over DoP will require a PCM 705.6 khz
3. Solutions for double rate DSD (128FS) and beyond
Two solutions are possible depending on whether the used PCM transmission scheme is capable of supporting the PCM rate of 352.8kHz or not:
This came from: DoP open Standard | DSD-Guide.com which illustrates the DoP open standard which is supported by Audirvana as well as a number of other well known companies.