Because it’s not about the DAC, it’s about the CCA sending very low bitrate files when using Spotify.
Again, only for Spotify, without Volumio involved. I was just explaining why I switched to my current setup. This was highly noticeable and has been documented.
edit, look at the “solution” here : Solved: Chromecast Bitrate - The Spotify Community
CCA is not using “Spotify connect”, which would be 320kbps at least. It’s using a gimped version of “Cast”, which means you get low quality streams, in 256.
A DAC won’t create hi-rez files out of thin air. If the source is low quality, the DAC will work with that and won’t make it sound good magically. smh…