@questforhifi The EitherRegen did nothing for my system that I could hear. I also use fibre near the last mile before my DAC. I do not have the X1 for direct fibre so I use the Sonore OpticalRendu (fiber-2-usb). This is was a massive improvement in sound over non-fiber (Sonore microRendu). The EtherRegen did not even improve my RJ45 streamer in my KRELL K-300i integrated. I still use it but I should sell it.
You raise a very big issue that most people are reluncant to talk about. Why does the quality of the digital stream matter before the fibre cable. In other words, why do you need a noise optimized music server ($$$), why use fancy Ethernet cable, switches. I asked this same question to Chris Connell (sp?) the big cheese on the AudiophileStyle web site. I think he will write an article about this.
For me ignorance is bliss (with great sound) using my fibre.
I use the following to get my fibre.
Amazon.com: Ubiquiti Networks Networks UniFi Switch 8-Port 150 Watts, White : Electronics