@vonhelmholtz As an experiment, I bought a pair of DX Engineering inline RFI/EMI filters. I was instructed to place one on each end of the Blue Jeans Cat 6 line. $50 for the pair.
I noticed an immediate openness and clarity.. It was actually eye opening. They have been in there for a couple months. I have no intention of removing them. I also have no intention of trying several CAT cables because it requires fishing it through a suspended ceiling. The NA ENO and Etherregen are two other inline filters but cost much more. I am not sure of the design but the ENO seems to be very popular. There are many network switches out there also. Some are based on the Bonn. Open box pictures show others using this $300 switch and charging more. The other brands might be upgraded versions of the Bonn, I don't know. I have seen network switches priced anywhere from $70-$2500.
It's just like all things audio. If I'm happy with the sound, I don't need someone explaining all the theory and telling me I am wrong. I look for cost effective and affordable improvement There was another thread about this same subject in October. It devolved into a name calling, post deleting mess.
My experience tells me that streaming starts out as a good source of millions of songs, then there are several things that can be done to make it better. Lowering the noise floor is a big one. You can move up the cost ladder with streamers but there are several low cost things you can do.