16 to 24 bit MP3s

Can anyone shed light on the following. In my collection I have a number of MP3 files @ 320, 44.1/16. When played with Roon however, the signal path shows the source to be 44.1/24. No DSP is engaged so I wonder why this is so. Is bit depth somehow being increased from 16 to 24 and if it is, why?

That the input to an MP3 encoder was 16 bit audio does not make the output a 16 bit MP3 file. Lossy codecs generally have no inherent bit depth and can be decoded to essentially any bit depth.



Also see this very useful post

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Many thanks, that’s useful to know.