Lost with DOS2 migration

[struts]

I mean assuming that the phantom can already decode 24/192 I doubt we’ll see the same limitation


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Well I did the following test.  Using Audirvana on a Mac I played a 24/192 FLAC track (Come Away with Me, Norah Jones) from my hard disk to my Phantoms using two different streaming protocols:  

• When I select the Phantoms as the output device under "Network" in Audirvana (in other words streaming via UPnP over ethernet) Audirvana reports that it is indeed streaming at 24/192.
  
• However if I select my Phantoms as the output device using AirPlay via the "sound" widget on the Mac, and then select them under "DAC" (which basically means output devices available locally in the machine on which Audirvana is running) Audirvana reports that it is streaming at 24/44.1.  This, despite the fact that in "Audio MIDI setup", the utility that manages sound output on the Mac, the Airplay attached Phantoms are listed as only supporting 16/44.1, a setting which unlike other local output devices cannot be changed by the user.
  

We know the Phantoms can accept 24/192, we know that the codec (in this case LPCM) supports 24/192 so either the restriction is being placed by the AirPlay transmitter, i.e. Audio Midi setup on the Mac, or the AirPlay receiver, i.e. the Phantoms are advertising themselves as only being 24/44.1-capable.  

So I repeated the test, this time streaming via AirPlay to my AppleTV 4K.  Since both the AppleTV 4K and my Mac (Catalina) are AirPlay 2-compatible this should be streaming over AirPlay 2.  The result is the same, in Audio MIDI Setup the AirPlay Output device is shown as only supporting 16/44.1, but again Audirvana claims it is streaming at 24/44.1.  In other words it would appear that wherever this restriction is, it is not confined to the Phantoms and it is independent of AirPlay version.

So just for fun I repeated the test again, this time streaming the same album at 24/192 from Qobuz on my iPhone (iOS 13.2.3) via AirPlay 2 to the AppleTV 4K.  The track played without any problems, although of course it is impossible to know what bit depth/sample rate is actually being presented to the DAC in the AppleTV!

Go figure.