Does anyone have a digital system that is as involving as their analogue front end?

How about something like this for ethernet isolation? I could order it from Amazon and send it back if it doesn't made a difference: iFi LAN iPurifier Pro – Ethernet Noise Filter with Optical Galvanic Isolation, Jitter and Error Elimination – Plug-and-Play for Enhanced Audio & Video Streaming Quality – USB-C Powered

If you are streaming and using a LAN, the LAN becomes your main starting point. Anything you can do to lower the common mode noise like audio-b-dog's suggestion of a iFi LAN iPurifier Pro is a great idea. LAN routers and switches along with their switching power supplies become generators of noise and distortion. Once you can find the best way to clean up the noise on your LAN, your Streamer and DAC will sound significantly better, more engaging and organic. The cleaner your digital stream is of common mode, differential mode, and RFI noise the more amazing your digital front end will sound. Here is an article on how to isolate your Streamer from the network. Thousands of audiophiles including me already do it. 

 Complete Audio Network Isolation for $30 USD

@ejh369 

My streamer is plugged directly into an ethernet port on my ATT fiber hub which has four ethernet plugs. I use one of them. Then I run 35 feet of ethernet cable under a rug. According to chatgbt, with the excellent filtering software on the Meitner, I might not need to clean it up. But the iFi LAN iPurifier Pro – Ethernet Noise Filter with Optical Galvanic Isolation, Jitter and Error Elimination – Plug-and-Play for Enhanced Audio & Video Streaming Quality – USB-C Powered sold on Amazon for $299 might do something. If it doesn't, you can return almost anything to Amazon. So, it wouldn't be a risk trying it. I'll wait until I receive my Meitner MA3i and get used to its sound to try the filter. I've seen these filters for thousands of dollars, and I'm not sure how they would be better than this less expensive one. @audphile1 ?

I have the bssic iFi lan isolator for $85 or whatever it costs. In my system it doesn’t do much. I guess my Ethernet cable does a very nice job so I removed it. However, with a 35ft run of basic Ethernet cable it might help. Worth giving it a try but in my opinion only after the break in. You can also try the iFi isolator pro which is similar to Matrix audio but not as feature rich - the iFi uses wall wart power supply bs Natrix inbuilt linear power supply, the iFi won’t reclock the signal as well as the Matrix would. 
Passive filters like Network Acoustics Eno round off the edges too much. I had and sold it. Stack Audio makes a similar device as well. Watch few reviews on Hans’ channel. He covers a lot of network tweaks. 
https://youtube.com/@thehansbeekhuyzenchannel?si=bpEE6uMAKRYWywNh

Personally, my recommendation would be to use a mesh node about 1.5m away from components and get a nice Ethernet cable from mesh to Meitner.Something like DH Labs or Wireworld Starlight 10 Twinax. 
Second option is to run your 35ft cable into something like the Matrix Audio SI-1 and good cable out of Matrix into Meitner. But…definitely worth giving the iFi Pro a try if you can return it. Just get a high quality Ethernet cable out of it into the DAC

@audphile1 

Streamer and DAC separate, but I can’t swap it because it’s an Exakt system. 

In any case, I am in process of repurposing the Roon NUC for a cut down version of Windows so I want to see how that works out. That’s been interrupted by holidays.

The functionality of Roon and jPlay is nice to have, but I am happy enough with the Linn App provided I’m getting the best sound quality.