Thank you
@Brantome for interpreting what I meant what I wrote at the time, cause it was straining my brain trying to remember
I’m not using the AirPlay casting functionality, so I don’t know how well that is working (I only tried it once and it worked fine at the time).
Update: I still have the mini via optical into Echo Studio (works well). Still waiting on WiiM Pro Plus to get ‘Roon Ready’ certification (then I’ll buy it), and then I’ll do a switcharoo with the mini for the WiiM Pro (Legacy) at which point the Echo Studio will then become a Roon Ready endpoint via optical (yay).
I also learned recently (and ya’ll probably already know this since ya’ll are more advanced than me) that Optical connections apparently usually maxes out at 24/96 (dependent on device and cable), but coax maxes out to 24/192. So the mystery of why my Denon would only max out at 24/96 has been solved cause I was using the Optical input. I changed it to Coax and now I can stream up to 24/192 on the Denon. So that was a fun mystery to get solved.
Apparently though the Echo Studio can only handle 24/96 input per
@Brantome earlier comment about this (so I believe my earlier scientific chart still applies).