Ethernet Cables, do they make a difference?

@markcooperstein there is one difference - cable look really, really cool.
This thread convinced me to make one really good looking cable, I shall order the best looking TechFlex, cover my Cat6a and - I’ll feel so good.
And I promise I’ll report back here if my sound is better.

Stand by...

@almarg thanks for the great quote of respected expert.
noise and/or RFI is a separate beast shielding, twisting and other means help but moving and turning cable may produce even better affect, removing cable from the system (at least when playing music) solves the ambiguity in the root.

I suggested above to compare playing the same source over the network and directly (by copying file to the media player storage)

@astewart8944 

Gravity is unimpeachable? Says who? Gravity could easily be an emergent quality of properties of the universe we haven't developed tools powerful enough to probe yet. On the other hand, quantum electrodynamics completely describes every facet of physics that could possibly effect an Ethernet cable. The science of the electromagnetic force is unimpeachable. The science of gravity is open to broad debate. 
We've become very, very good at measuring EM phenomenon. Perhaps there's room to debate what measurements mean, but it's flat wrong to suggest there's anything about audio we can't measure WAY beyond human perception. 

@astewart8944 I would prefer an opposite example: someone puts a fancy component into the system and feels good about it, starts hearing better sound or both, good for him/her. Even if doctor says - it should not help...
Hopefully he/she did not spend a lot of money on that and no one who made a component feels like he outsmarted another customer and got easy money.

kosst_amojan

Usually when somebody presents claims of symptoms that have no basis in reality they’re treated with psychiatric medications. Is that what we should do with people who hear Ethernet and HDMI cables?

Doctors don’t just throw up their arms in frustration when faced with a difficult diagnosis and then simply write a script for psychiatric medication. Instead, they call in other physicians and scientists, often from other specialties, and they work as a team to find the answer. That’s very different from you simply pronouncing others here as crazy.

In some totalitarian systems, people who don’t conform to the government mandated norms are often labelled as crazy, and then pumped up with drugs or sent to a gulag. It sounds like you might like that kind of country - as long as you could remain in charge. Thankfully that isn’t the case here.