Automatic changing of sample rate

[Martin_Webster]

It sounds like you may be using System Output rather than Built-In Output, and the OS mixer is downsampling. See this post …

Difference between Built-in output and system output?[Answered]

To expand on the answer above a little bit: System Output is going to make Roon’s output function like any other application – audio is sent to the OSX mixer, where it’s mixed with other sources (Youtube, system sounds, etc). In many cases, the audio will be resampled during this process, so this mode is more about convenience than critical listening. For example, if you switch your default output from the Macbook’s speakers to a bluetooth device, Roon’s output will go with it, because it’s si…

It would be really helpful if you could share a screenshot from Settings > Audio showing those DACs. Thanks.