Optical vs Ultra Rendu.

yyzsantabarbara - thanks for the link

Then to add more confusion, the wiring diagram on the Small Green Computer site show a simple fiber ethernet cable going from the router to the optical Rendu.

https://www.smallgreencomputer.com/collections/recommended-solutions/products/systemoptique-server-player-combo-sonictransporter-i5-or-i7-cdr-opticalrendu-4-port-gigabit-switch-with-fiber-port-and-power-supplies

So, what is all the extra hardware seen in this Hans Beekhuyzen video starting around 2:05. Such as the SFP media converters. What is the difference between these two set ups and will there be any difference in SQ? 

https://www.youtube.com/watch?v=q0A0l6keKTg

SGC - That is because the switch has an optical output

OK, I think I get it, thanks singingg!

I have a BlueSound Node 2i.  Would this hook up to my BlueSound?  Has anyone done a true blind test?  This would require someone to change the connections to do an A/B comparison without the listener knowing the source by doing a random switching back and forth.  Try to stump the listener and then tell them which connection was what.  Some of these expensive add on little noticeable difference.  Kind of like splitting hairs in my opinion.  Which is more noticeable, upgrading speakers or amplifiers or using this add on?