p05129,
It has been a while since I listened critically to streamers and the mode of transmission, but, I agree that Ethernet consistently outperformed asynchronous USB connection when I heard a comparison.
While it does not seem to make sense that a streamer can make a whole lot of difference beyond a certain point of basic competence, it does matter. I have no idea why it is so, but, early on, I heard comparisons of the software managing streaming and NAS music files and some software truly sucked compared to others when it came to sound quality; how can that be?