Galvanic isolation revisited.

I use an EMO EN70HD

It seems Mouser is carrying some of them now, but those prices ... 😫

What I do like about them is they are taking the opposite approach of a lot of network surge protectors. From what I’ve been reading about lightning damage in Ethernet networks, the problem seems to be that lightning finds too easy of a path to ground, and surge protectors with ground connections want to make it even easier. When the surge protector trips, a huge current flows and anything in that path is toast.

These do the opposite and add ~ 6kV extra isolation with each isolator. A really good idea right after your cable modem. OTOH, at these prices using a fiber optic adapter ($60 for 2 + cable)  to create an air gap is going to become very affordable.

Do you have a link to where you purchased it?

While I've not tried the EMO, in my comparisons optical has provided lower noise floor than a number of ethernet configurations I've tried. Optical is only solution that provides 100% galvanic isoloation, certainly not as many choices in equipment as ethernet.

OTOH, at these prices using a fiber optic adapter ($60 for 2 + cable)  to create an air gap is going to become very affordable.

That is what I use, with 45 feet of fiber from my router to the network switch at my system and it seems to work and sound great.  Of course I also use the Bonn N8 switch, a GigaFOILv4-INLINE Ethernet Filter, and the Network Acoustics ENO Ethernet filter and Streaming Cable.  I do not use anything on the USB cable from my server to DAC but the server uses the pricy JCAT USB Card XE, and my USB cable run is only 0.8M.