I have been interested in any benefits of using fiber Ethernet to connect my DACs to my home network. While I would like to try the SystemOptique, I have three main listening locations in the house each with UltraRendu, Oppo HA1 DAC and Oppo PM1 phones. Core is a Small Green Computer SonicTransporter i7. So, the cost of conversion to SystemOptique was prohibitive for me.
So, I decided to try the much less expensive route of using fiber to Ethernet transceivers, short pieces of fiber cable with the DAC end transceiver powered by iFi 5V power supplies, which I had from another system iteration. The transceivers are multimode Bidi brand and cost $63 for the pair, including the SFP module inserts. The cable cost varies by length, of course, but 1-2 meter cables are $10 or less. I had the iFi PS but they cost about $50 for the required 5V ones. So, the investment was not at all prohibitive, even for use in all three locations. I also installed a fiber link from my network switch to the SonicTransporter Core.
As for me, I am a retired Electrical Engineer who began his HiFi/Stereo hobby at age 11. That was 61 years ago!! Also, a good friend installed two sets of fiber links in his audio system and had similar results as mine, which confirms that my impressions are not imaginary:-)
So, how did it turn out? First was the link to the DAC at one listening position. Immediately, I noticed increased clarity in vocals, using the very well recorded Neil Diamond albums at 192/24. Then Streisand, Celine Dion and others with same impression. Bass was also cleaner with better transients (drums) and, oddly, stronger bass output.
Then I put in the optic link to the SonicTransporter Core. Similar improvements with about equal amounts of improvement in vocal clarity and bass transients and output.
I know that some readers will not believe the significant amounts of sonic improvements, but they are real. And, as stated above, my buddy noticed almost identical sonic benefits when he installed fiber links to his microRendu and NUC Core.
Now, if I were to start all over I would certainly consider the SystemOptique route but this was a relatively inexpensive way to try fiber to see if it would improve my listening experiences. Try it and post your impressions.