Others have complained about sound quality from Roon with the CXN V2. This suggests to me that Cambridge Audio has something wrong with their implementation of Roon firmware on their device. I’m surprised that it made it through Roon Ready certification with issues like this though.
In that thread, I proposed that the person with the CXN V2 try converting some of his albums from FLAC to WAV and stream those via DLNA (or play from a thumb drive) to see if the results sounded more like Roon. He was very rude and did not bother trying this, but I hope you will consider it. I’m very interested in the results.