How are you getting sound out of the phone? I’m pretty sure iPhone resamples all audio output to 48 kHz. I see the same type of entry in my signal path if I play audio from the phone speaker. With a lightning->USB connector feeding the dac of some desktop speakers, the resampling drops out.
The Apple adapter will allow you to use a standard USB cable.
Or you can get a Lightning to usb OTG cable and skip the adapter.
The FiiO OTG cable is working nicely for me.
I tried a couple from Amazon and they work but the connectors don’t fit as well as they might and I was getting disconnects if I was moving around.
Some usb dacs ship with a lightning OTG cable
Torben_Rick
(Torben - A Dane living in Hamburg - Roon Lifer)
7
Got the same problem even with iFi Go Bar and iPhone 11.
Are you sure you’re playing a lossless high resolution track? Set the resolution in the Roon ARC app to “Original Format” for WIFI and/or cellular. I do both.