A good network switch can and does make a Audible improvement
for example the Uptone Audio Ether regen at $630 it absolutely works with many reviews , much better still is the Synergistic research Ethernet switch and power cord $2k. Is pretty steep but makes Avery nice improvement in fidelity
I currently have the uptone I may go with a Quality Ethernet to fiber optic like Sonore .very good digital cost $$ ,just as a good turntable does.