I don't care for upsampling within the U2. Roon does a far better job via Muse. The main reason is that Lumin only sends half of it's max supported bitrate for some reason. My Ayre QX-5 will accept 768/705.6 and send the signal directly to the DAC chip, thus bypassing Ayre's digital filters. And this sounds even better than sending it original sampling rates. I also use the optical input on the U2 and my LAN is all-fiber. Just a very short copper run out of my NUC running ROCK. The rest of the path (some 50') remains fiber all the way into the U2.
Streamers: Lumin U2 vrs Aurender N200
Has anyone compared these two units? Do you have a sense of the tonal differences between them? Tone verses detail. The U2 has gobs of clean detail (gobs is a scientific measurement), but I think the detail is a bit hyped by boosting the tonality in the presence region. I have the U2. I have not heard the N200. Any help out there?