Help optimizing my streaming setup

Fiber-optic cable with converter boxes works well for me

I'm in the camp that an audiophile grade switch can provide sonic benefits. 

Your router is not an audiophile grade device.  

I inserted an English 8 Switch into my setup a year and a half ago.  It yielded immediate sonic benefits.  A decent switch will re-clock the signal and help de-jitter and de-crapifie the signal. 

If your router uses copper to get from outside to inside get an isolator like this one to increase surge protection. Also consider one at the streamer.

I find this solution a little better than using optical converters in the middle because they don’t add more wall-warts that can add more noise.

@erik_squires : very interesting find! And very affordable (audiophile language speaking obviously).

I would have been in the camp of being sceptical about switches -  especially the idea of putting a switch into a setup that doesn't have multiple devices. However, having assessed the effect of inserting a quality switch in two separate installations, I have changed my mind.

That said, looking at the two installations, the positive effect of an audiophile switch was greater where the setup involved more convoluted wiring and another switch upstream of the music server.

But even in the more purist setup involving a CAT 6 connection direct from the router, the switch still made a worthwhile improvement.