I see the issue with ABX blind testing

Dwcda:  I just went back to the beginning of your post.  We have wandered a bit from your original posting.  First of all, you have assembled what looks to be a fabulous system.  Very nice indeed.  Congratulations.  Putting aside the blind testing for a moment, when it comes to cables its easy to get lost in the weeds.  The first rule of cables is that they should not get in the way of the music.  That‘s heard a lot on these forums.  My rule, if I do not hear an immediate difference, or improvement in a cable or power cord change, I go back a step and try again.  I‘ve been involved in blind subjective testing in automotive but it was always done with a jury of four people.  Test conditions have to be stable and at a minimal level.  Testing was always done either in an open field or a hemianechoic chamber.

I have a question.  Having integrated subs into my stereo one time in the past, I struggled with getting the phasing right- or at least how I liked it.  I see your sub in the middle rather than placed at a node.  It is also forward of the plane of your speakers.  Are you able to adjust the phasing of your sub?  Ie, does your sub have a phaser adjustment?  The sub could also be confusing your listening results with different cables.  Did you try listening to different cables with the sub unpowered?

I moved the sub to the right, between the stand and the right speaker, about an inch behind the front of the speaker. I've also ordered a second sub.

As for the cables, I'm satisfied with my assessment. I don't believe anything I do will result in a dramatic difference and for the price it would have to be dramatic. So I've sent them back. I had neighbors interested in hearing the difference but my opinion of the sound is all that matters to me as I'm paying for it.

Neighbor blind test is the ultimate one of them all. You get the true ABX blind test using non audiophiles who are not familiar with your system. There ain’t no chance in this world that there would be any difference identified between cables.
You would be promoted to a rank of a General by the minions at ASR. You should have totally done it. 

My very rational and very intelligent half deaf wife is ASR first supporter ...😊

We stay married but we differ here ...😁😊😉

I had no neighbor nor any need for one ... 😎

( my story is a parable here)

Audphile1:  I wanted to disagree with you but then I thought of my wife and brothers.  You are probably right.  The differences seem obvious to me.  And my two sons.

Seems like any non audiophile that hears my system expects to be blown back into their chair by the bass.  That‘s what seems to matter.  They are generally disappointed.  I might as well just set up the Sony boombox behind my speakers that my brother talked me into buying.  I‘m sure my wife wouldn‘t know the difference.