Ethernet Cables, do they make a difference?

clearthink - It is apparent that the Moderators have reconsidered they're position regarding you're $25K challenge so let's keep it all in public there is nothing no longer to fear! TYhe blind test should be done with an ABX comparator or an equivalent device they're a a number of these if you have already arranged with an audio dealer to participate in this test it is possible they already have one why don't you ask them and report back.

I agree with ABX test. Please confirm the parameters of the ABX test conform to https://en.wikipedia.org/wiki/ABX_test and that you agree to 95% confidence level (25 trials). In other words, please confirm you can audibly detect with 95% confidence that ordinary speaker wire is or is not reversed.

I shall then reach out to you and the audio dealer. 

What do you mean by ordinary speaker wire? I do not actually know weather or not I can detect it on reversed direction or not I think it would be better to test the audibility of the cable first which is a more likely certainty of audibility and what I thought we have been discussing hear with the forum does that effect your $25K USD offer also there may be other things we can test with more people involved so lets' have a conversation hear about other things to test. 

clearthink - What do you mean by ordinary speaker wire? I do not actually know weather or not I can detect it on reversed direction or not.....

Please refer to the scientific double blind test thread, with posts beginning from 03-10-2018 6:55pm
https://forum.audiogon.com/discussions/scientific-double-blinded-cable-test

gdhal"Please refer to the scientific double blind test thread"
There are 100's of posts in that thread just tell us hear what you mean by "ordinary speaker wire" and if you are open to other participants in the challenge perhaps willing to meet your $25K USD to attract more participants.

@markalarsen - no baiting, trying to understand your configuration and what you imply by "Ethernet connected to DAC"
From the "Bel Canto" web site:

The Black EX Integrated amplifier is an all-in-one component designed in a custom plated high-grade aluminum chassis that combines high-level DAC performance and our custom amplification. The EX Integrated has the versatility to connect to any source with simplicity and ease, including MQA, Roon, DSD, and includes an internal programmable phono stage.

Key work is "All-in-one"
Device above combines many components in one (from the Ethernet cable to the analog output - simplified):

• RG45 connector
  
• Network card
  
• Memory buffer
  
• Media player
  
• Digital to Analog Converter itself
  
• Analog sound circuit
  
• Analog output plugs
  

Do not get me wrong - I'm not questioning quality of it but...
With so many components combined in one unit there are a lot of possibilities to get noises produced by digital components in the analog ones.
Bad or even wrongly designed shielding of the Ethernet cable can produce audible effects so much spoken above.

High Audio quality Ethernet cable may show poor performance in the data centre where throughput is important.
High Network quality Ethernet cable may show poor performance in the audio system where no-noise is important.

Both sides in this discussion are right! Period!

I shall say it again - each setup is different!

Mine performs the same on Cat5 and Cat<a lot> because... (drums)
Ethernet cable delivers data to computer, computer runs media player, media player buffers input and sands steady data stream to DAC over the optic cable or USB cable.
Optic cable facilitates that electrical disconnect in digital chain below DAC.