Ethernet Cables, do they make a difference?

@grm. Good test. You may want to try a Cardas, AudioQuest or Wireworld Ethernet cable. They run around $200. If the one you buy fails the test, sell it here on Audiogon. 

@grm Thanks for posting your results. The test isn't lame. It is realistic. Could it be published in a respected scientific journal? Nope. Does that really matter? Not at all. Will others criticize it? Undoubtedly. But, the critics may have biases that will not allow them to ever admit hearing a difference that they zealously contend is empirically impossible to hear.   

@grm, Try Supra CAT 8

https://www.ebay.com/itm/Supra-CAT-8-STP-patch-cable-1-meter-Made-In-Sweden-THE-BEST-FOR-NETWORK-AUD...

Sounds best in my system and least expensive.

@grmThat test you conducted is I feel a good way to do it, have non audiophiles help you out. That way they are using their ears only and as far as I am concerned the only way to go. I remember in the 70s there was a raging debate over sound versus science and the two protaganiste were Peter Walker of Quad and some of the staff of Hi Fi News and Record Revew and the gist of it was that Mr Walker said that specifications would win over percieved sound quality. Now we know that Mr Walker did make good products in his time but no one I know have ever said that his 405 current dumping amplifier was in the upper eschelons of the best amplifiers of the day. I myself had one and although it drove my ESL57s well when I changed to dynamic loudspeakers it was dull and lack lustre but it had superb figures on the test bench. The upshot was that HFN tested the 405 against an amplifier which didn't measure up anything like the Quad did and I am sorry but I don't remember which amplifier that was used but when they did their extensive tests this other amplifier was way above the Quad in terms of sound quality and enjoyment thereof. Mr Walker declined to participate in the test.The amplifier I switched to was made by Meridian and it was altogether a different beast where it had better sound quality and far more believable dynamics. Just as today Quad in their day had a lot of zealous followers who would not believe that their Quad products could be beaten by another brand. So today we have people who will not attest the fact that something as stupid as a piece of wire can make an improvement to the sound quality of an audio system . Another analogy that I put forward is people spend vast amounts of money on amps and speakers today and only to put cheap wire between the components is anathema to me. Would you put Ford Focus brakes on a Maseratti or cheap petrol in a Ferarri Testarossa no I don't think so. So lets just keep our better sound quality to ourselves and leave the people who think it is all in our imagination to go home and close their doors and be blissfully unaware of the improvements that they could make.
Jim.