Evo 150 - Incorrect Display of 24-bit PCM for MP3 with VBR (ref#0W6TBP)

[Frank_Gottschalk]

What’s happening?

· Something else

How can we help?

· None of the above

Other options

· Other

Describe the issue

Wrong Display 24 bit PCM on Evo 150

Describe your network setup

Not a network issue

[Frank_Gottschalk]

The file format is 192 kbps MP3 with 44 kHz, but shown as 24 bit PCM.

[Rugby (aka Daniel or Big Dan)]

The way Roon works is that the music file is read by the Roonserver and processed into PCM and then sent to the DAC or endpoints. So, your display is correct.

[RBM (René)]

The signal path in your Roon app will show you exactly what’s happening and when.

As for the 24-bit, here’s an explainer from the horse’s mouth:

ACC MP3 lossy output 24bit

Once audio has undergone lossy encoding, it no longer has an inherent bit depth. The encoded bits can be thought of as a mathematical description of how to reconstruct an approximation of the waveform that went into the encoder. The decoder usually calculates the reconstruction using floating point or integer math with at least 24 bits of precision. We chose to output 24-bit PCM in order to avoid introducing unnecessary dither to the decoded audio. Dither is basically a necessity when dropping a…

[Frank_Gottschalk]

Thank you for the clarification. Usually I hear FLAC files, and only a few old MP3s.

[Rugby (aka Daniel or Big Dan)]

@Frank_Gottschalk

FLAC

Again, Roon wil process the flac into pcm.