@macg19 I am not an expert or audio EE but my understanding is that it cleans up the the ethernet much better than your standard FMC before handing off the signal to the optical cable. It includes Four (4) high-quality ultra low noise linear regulators and a Fixed frequency high-quality ultra low jitter FEMTO oscillators and more. https://www.sonore.us/opticalModule.html
On my system I have: Router-Ethernet-Optical Module Dlx-Opt cable-Sonore Signature Rendu SE DLX. When I replaced a regular FMC for an OpticalModule it improved the SQ noticeably on my system. How it does it I really don’t care.
The price you mentioned is the Opticalrendu streamer. The Opticalmodule is $599 new or they come up used around $400. Lps is $200 new at SGC or Amazon has a couple nice ones for ~$100. see links below. Enjoy the reads…
https://www.amazon.com/dp/B0BW488FKN?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

