Add a Linear power supply or iFi SPDIF Purifier2?

Yes using fiber optic is the best medium for isolation , the Sonore Deluxe is much better ,I started with just a media converter , the big difference inside there are linear technologies low noise regulators ,choke, and very low jitterFemto clocks 

the $40 ones will work but have high phase noise you should at minimum at the end point spend $499 for the Sonore, Small Green Computer  sells them and has very respectable LPS power supplies the 12 v  model I bought for my rougher is 

6 lbs for $300 is a great buy , these too take about 100 hours to settle in but it is now much clearer ,more depth and the top end bite is gone , after theLPS  the aftermarket  DC cables and a inexpensive pangea powercord , these tweaks add another $1k to the mix ,I have 3 LPS for the 2 Sonore deluxe media converters , and forthe New Motorola 8702 modem-router ,with the much faster 3.1 Docsis technology Big sale on AMA         Zon.

@audioman58 , that seems like a lot of complexity and a lot of scratch. I am sure it was pleasing once you got the end result, what about a simple plug and play for those of us who hate complexity and spending $$$?

I also don’t quite understand how to setup optic Ethernet.  Both the NAS and streamer are connected to the router.  And the Ethernet cable between the streamer and router is long.  So, with optic ethernet, the idea is to connect thebstreamer and router with an optical cable instead of ethernet cable?

You can go from Ethernet to fiber optic to start ,then upgrade at your pleasure.

the sonore deluxe converter should be your end of chain for $499: $$ well spent .

one step,at a time.

@gte28 

Check PM.

I will say that it is quite difficult to return any AliExpress items. Better to try from Amazon. If it works is it actually worth it to wait weeks to save a buck? And what is the actual percentage of revenue that goes straight to China?