Article: UpTone Audio EtherREGEN Review and Comparison

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When making the Copper vs. Fiber comparison in austinpop's review, the diagram shows copper connection into the sNH-10G and out from the EtherRegen in both conditions, the difference being that in one case the two routers are connected with either copper (cat 6 cable) or optical cable, is that right? Would the better sound quality reported with connecting the switches via an optical connection due to the galvanic isolation? Would there be a benefit in running the audio on an optical network throughout and if so what components would be needed to achieve that?