Cheapest way to enhance SQ with digital streaming

As described, this is a simple and inexpensive solution for connecting an audio server to a home network that offers the benefit of immunity to RFI/EMI (except at the converters).  My run is 45 feet long and I am using this fiber into two of these converters.  In my system, I have a hard time discerning a difference between the optical solution and 45 feet of CAT8, but every system is different with different levels of quality and design on the inputs/outputs, connectors, power/grounding, and other factors.  This may not be as much of an improvement for me since my system does not seem to have noticeable noise to begin with.  As some have pointed out, the addition of two converters and two power supplies may have an effect on one's system. I am using LPS to power the converters. I am glad the fiber is working out for your system.  What you described is an example of how to accomplish something without spending big "audiophile" money.

I recently added the Network Acoustics ENO Ag Ethernet filter and their 1M cable.  That filter will not work with the 1000Mbs MC200CM converters so I had to purchase 100 Base converters in order to use the fiber with the ENO.  Also, make sure the fiber cable you purchase matches the converters since there are a couple of different types of cable and I believe I had to switch when I purchased the MC100 converters..  I typically do not like small boxes cluttering up my signal chain, but the ENO is seeming to improve the sound from the incoming Ethernet, although for quite a bit more money.  I am also using a switch after the second fiber converter and before the ENO, with very short CAT8 cables between.

@peter_s 

Does anybody know whether one can disassemble the cables from the clips, run them through smaller holes, and then reassemble onto the clips?

The answer is yes - that is what I did.  Here you go.

"wow, the difference was huge and amazing"

I have been around the block and back on this stuff but I just don't come to the same conclusion as above.  I have 45 feet of fiber, converters, LPSs, Network Acoustics ENO and Ethernet cable, GigaFOIL v4, and the Silent Angel Bonn N8 switch.  My internet is high speed with an Orbi mesh router system and a standard switch at the main router which separates the audio stuff (the Silent Angel Bonn N8 switch is near my components). I am using Mojo Audio's DejaVu server and EVO DAC and with those components, it is my experience that any sonic difference/improvement resulting from all the digital "add-on stuff" is subtle, if any.

I decided to simplify all this "stuff" by moving the Silent Angel Bonn N8 switch near my main router, running 45 feet of Ethernet cable from that switch directly into the GigaFOIL v4 (which is near my components), and then running the Network Acoustics Ethernet cable from the GigaFOIL v4 directly into my server.  The switch, router, and GigaFOIL v4 are all on LPS. 

I am having a hard time discerning any sonic difference resulting from the simplifications.  My system sounded good before the changes and it sounds good after.  I may reintroduce the ENO and/or try moving things around a bit just for kicks but I am skeptical this stuff does much of anything, and certainly not to the levels discussed by some on these forums.  Maybe I need to listen more, or maybe the add-on stuff is more helpful for systems located in noisy environments.

It would be interesting to hear your impressions if you took out all supplementary devices 

Interesting idea.  I will give that a try.  IME, my biggest streaming improvements over the years have been through upgrading components and digital processing.

BTW, the 45 feet of fiber vs. 45 feet of CAT8 Ethernet comparison is easy since both of those runs are already in place.