(01-Feb-2022, 23:26)frogster99 Wrote: I also thought it would take the 24/192 feed and just downsample but it doesn't, it will take 24/96 no problem, I don't know if it then down samples. I know it can only handle a maximum of 24/96 so that's fine but I thought again it would just down sample the 24/192 instead it just doesn't play it.
Is there a way to actually see what sample rate the phantom is getting?
Yes and no. Roon has a feature called Signal Path where it reports what is happening to the signal downstream so you can see if/where the signal is being sample rate converted. This is clearly dependent on it receiving the correct information from the downstream system.
Up until the latest Phantom firmware, 2.14, this appeared to be showing the correct information (although there is almost no way to verify it - except the below), however in the latest release it has stopped reporting the downsampling to 24/48 although it is still clearly happening. I have logged tickets with both Devialet and Roon (although it appears to be the Devialet firmware update that has broken it)*.
The only other way to test that I am aware of is to measure and analyse the actual sound coming out of the speaker. This is how I have verified that low-pass filtering and/or downsampling to 24/48 is still taking place even with 2.14 (at least on RAAT and UPnP) even though the Roon signal path is now reporting that 24/96 material is being reproduced losslessly.
So the situation appears to be as per the specs on the Devialet website. In DOS RAAT, UPnP and Toslink are all limited to 24/96 at the input, and everything north of 24/48 is downsampled to that before DAC. However when used in Optical Direct mode Toslink provides a full 24/96 signal path.
* On 22/2 I received a response from Devialet confirming that the reporting of signals >24/48 as being reproduced losslessly is indeed a regression bug introduced in 2.14.4 and will be fixed in an upcoming firmware release.
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