Check out this thread
Much the same story a while back
I used. RPi for a USB connection but Class 2 for 192 hi res failed. You can use Class 1 USB but you’ll limit at 96
I finally added a Allo Digione card and connect to the CXN via coax , hi get 24/192 the best the CXN does
It will cost 200$ ish but does the job, gets around Airplay limitations
BUT the artwork display doesn’t work,you are really using the CXN as a DAC , the Digione is the streamer
Mike