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Wklie, Thanks for the article. It certainly helps to explain noise being generated from the power supply of the switches. I have already replaced the Lumin switching PSU to the HDPlex Linear PSU. Also, I have an Astron Linear PSU powers the Synology. Maybe I should look into replacing the switches PSU. Again, thanks for your inputs.

Wklie and mav52, Thanks for sharing your experiences. I also read somewhere that Lumin streaming through Ethernet should be better, but my experience is not. Mav52 - can you describe why the ethernet sounds better? In my case, the USB drive seems to have better focus and more pin point imaging. It seems more dynamic and "quicker". The Ethernet is still great, but just not as good. Wonder if there is something I should tweak in my NAS set up? In my set up, I have the Synology NAS powered by a linear PSU. It is about 20 feet CAT5 run from my router to the Lumin. I have both NAS and Lumin connected to the FIOS modem/router. Or would it be better to connect them via a separate switch from the router? Will do more tests and report back.

I have a Lumin D1, and can play tracks sourced from Tidal, NAS drive (Synology DS 216+ with minim server) and USB flash drive. The Lumin app plays flawlessly. I tried to compare the sound quality differences between inputs (Ethernet NAS drive vs. USB thumb drive). It appears that USB has slightly better imaging and dynamics. Wonder if this is what most Lumin users experiences. Can the Lumin users share their experiences with USB vs Ethernet? Which one sounds better? Thanks!