Can a inexpensive RJ45 to Fiber optic converters sound better then coaxial ?

All the testing I've seen says Ethernet is essentially perfect.  It has built in ground isolation and great performance characteristics.  The one place where I use an Ethernet to optical converter is for lightning protection alone.

I had pretty nice ethernet setup prior to first trying two FMC, both with lps. Original setup was server out via 2nd ethernet port to SOTM SMS200Neo, usb out to Uptone usb regen (powered by lps) to dac. This with all AQ Vodka ethernet and AQ Diamond usb.

Next setup which bettered above was server ethernet out to the two FMC with lps to SOTM to Uptone usb regen to dac.

Best setup has been and continues to be, server ethernet out to single FMC to Sonore OpticalRendu (powered by Uptone JS-2 lps) to dac. Getting rid of one FMC, lps to power it, one ethernet cable and Uptone usb Regen not only simpler setup but also far lower noise floor and more relaxed presentation.

The two generic FMC should excel, only listening to the FMC in your setup can ultimately determine your preference. Minimal cost of this conversion makes it a no brainer IMO. OpticalRendu would be optimized optical setup, this would be fairer competitor to the EtherRegen.

To SNS, uptone audio stopped making usb regen ,I am still waiting for them to make one again ,unless Sonore makes one .

I own the uptone Ether regen and it’s very good .

thesenore setup is probably $4k once you get the server , power supplies and fiber optic ,conversion ,being semi retired and saving for a new car - non electric 

I am trying to find any Sonic improvements that are not in the $1,000s to gain  improvements if possible , Thanks for your input 

The OpticalRendu does the job of second FMC, streamer and usb renderer. Does FMC and usb rendering extremely well, do in part to dual Femto clocks, one for fiber, other for usb.

Yes, the Sonore route relatively costly. I suggest you try the dual FMC with the IFI power supply, cheap and will give you idea of what optical can do.

Ok Thanks guys for the assistance 👍