Melco Audiophile NAS

[zheng4]

I am new to this forum, just joined a couple of minutes ago. Apology if the following question had been raised and answered previously here (I don't have time to read the whole yet). I noticed a very recognizable improvement in 3D image and clarity after I inserted an optical connection between my router and PS Audio DirectStream DAC Junior (router-ethernet-TP link media converter-optical fiber-TP link media converter-ethernet-DAC/player). My music files currently reside on my Buffelotech NAS, which is close to its storage capacity, thus consider to expand the NAS or purchase a Melco unit. I stream music with Roon on my PC. Do any of you have the optical connection along with Melco? If yes, what further improvement with the Melco following inserting the optical connection? I guess I don't fully understand how Melco improves the sound. The optical connection really reduced much noise through the line. Thanks.