Can DOS 2 Phantoms reproduce acoustic programme above 24kHz?

[streamy]

As follow-up I generated the files as a set of 24/48k flacs and played them. Surely, taking into account that the 25kHz sine signal was almost canceled out due to Nyquist violation. Surprisingly, or not, all signals played through and either I heard the 1kHz signal or the noise on the tweeters confirming that the drivers were not muted. This same as the tests before all tracks were played via the RPi hat through optical in.

In continuation I played now all 15 tracks through the Devialet Spark software. To my surprise the 25kHz sine signal was not muted for all three tracks (48k, 96k and 192k). Here only a capable microphone like the UMIK-2 will show if the Phantom really play hires. So there is still hope.
The same when playing the tracks through UPnP. All files were played, no muting!
Let’s wait and see what @struts can record once he receives the UMIK-2.

More good stuff here [mention]streamy [/mention], thanks! 

Just to be clear, when you say you then played the tracks “through Spark” can you describe the signal path?  Were the tracks you played through the RPi not also controlled via Spark?

Hoping that proper measurements will show that an end-to-end 24/192 signal path has been supported at some point at least! 


Sent from my iPhone using Tapatalk

To clarify I’m still on DOS1 with my Phantoms. Devialet Spark is the SW that came with the Phantoms and has the capability to play from local folders, streaming services as Qobuz,Tidal, ... internet radio etc. I copied the tracks to a local folder on a MacMini that runs Spark. Then I can stream the files from the local MacMini to Dialog by playing them in Spark and Dialog distributes them to the Phantoms the way they are configured in ‘rooms’. The concept is similar to Roon.
Spark was always specified to be able to stream hires up to 24/192k. It actually does the job very well by now, fully gapless, showing transparently how much of the track is already buffered at the end point. But many Phantom users didn’t like Spark. For personally it is much better than the current DOS2 solution where you have to find inter radio software, streaming software.... of course Spotify connect was also always available. Better than Spark is Roon, even if I preferred the Qobuz integration in Spark as it included my purchases to be played in hires, better than my subscription. Ok, I’m deviating from what is relevant to the sound reproduction of the Phantoms.
When I played the files through Roon in Spark the optical outputs under “live sources” are chosen. This is my standard setup. The optical input per Room is selected in Spark. Then you don’t have to open Spark and run everything in Roon. On one of the RPi’s I’ve installed the “Devialet Phantom Volume Control” extension and therefore can control the Phantom volume directly in Roon. No need to start Spark.