Ethernet cables

You know how when you had analogue TV the picture used to get better or worse depending on your aerial, cables, interference, noise, etc? But your digital TV either has a perfect picture or no picture at all?

Same with audio over Ethernet compared to analogue. It’s the way Ethernet works. If there is audio at the other end at all, it is a perfect reconstruction of the signal. Any noise is not part of the signal and is ignored.
All Ethernet cables “sound” the same if they pass a signal at all.

Don’t believe me, but read this well-informed discussion and then see if you still want to spend more:

https://pinkfishmedia.net/forum/threads/ethernet-cables-and-sound-quality.210983/

Calvin - if you buy this Ethernet cable, which seems to modify the data, don’t use it as part of the network you use to make the payment online, will you!

Or is this cable so miraculous that it can tell the difference between the packets of data that carry your financial data from the packets that carry your audio data, and will let the former pass through unmodified, but will change the latter?

Switching one Cat6 cable for another of the same rating or higher should have no difference at all if you don’t have a serious fault somewhere in your system. If your streamer/dac or whichever unpacker the cable is connected to can’t filter the tiny amount of interference you get over a short run in a gentle environment like a house you’ve got a serious problem in your system. The whole point of Ethernet and its protocols is to keep the data the same and to ignore the noise. The problem is not the cable. That recommended filter is a sticking plaster covering a problem you need to solve - basically, if the amount of interference you are experiencing is defeating your hardware, you need new hardware, not a new cable. 

There aren’t many places left where “led by science, engineering and objective evidence” is a term of derision!

Now you have said that “guitars sound faster” I’m convinced. You are right. That’s all that’s needed - now the cable you selected and installed with an expectation that the sound will improve has reported by you to improve the sound by making the guitars sound faster, it proves that science, engineering and objective evidence is stupid. 
Silly me. 
With some notable exceptions like Doug S and Audio2design, too much of this forum is a dead end of the worst sort of audiophilia. The sort that causes our hobby to be derided and the people in it mocked. 
So carry on with suggesting science, engineering and objective evidence is a reason to be dismissive and rude.  Ignore your confirmation biases, your aged ears, the placebo, blind testing, and measurement. 
And then complain that young people don’t join you in your hobby.  You wonder why?