Where should I go from here with my digital front end?

Be sure to try LPS with at least last FMC before passing judgment, lps on both even better. The lps insures the garbage emanating from the FMC will be eliminated, switch mode power supplies injecting the noise.

I also mentioned the Sonore optical products as upgrade to the generic FMC. Better clocks and internal power supplies within these products substantial improvement over generic. Still need quality LPS with this. In the case feeding streamer one would use two Sonore OpticalModule in series.

Optimized optical is pretty hard to beat, even the generic with lps very nice.

OP,

I look forward to hearing your evaluation.

I tried fiber and it wasn't right for me.  It is a rabbit hole and you wont get to the promised land via Amazon.

I wish I had seen this before trying it.  

I have an ENO AG filter and it is nice.  I like the SOtM Cat7u better, I havent heard the new muon yet.

This is an interesting thread. I’m very curious about what the fiber connect will do to improve your digital signal. I’m generally curious about the whole bits part of the chain and what magnitude of improvements can be made there.  For $163 it’s a no brainer to try.  But if you start to get into $500+ changes, I would personally upgrade with room treatments or a DAC upgrade or an amp upgrade.  I have Belles  Aria monoblocks and they’re great but I know there are better amps out there.  Let us know what you hear.  Thanks.

It's easy. I stream through Lumin. It's great. I have 1000s of CDs I play through a high end Vd player. But if you want better sound, it's easy. Go vinyl. It will always be more pleasurable to your ears. It just will. My vinyl playback cost less than my streamer and CD player but is my go to first choice.