@bluemoodriver
Anton - you set out the pass mark, you’ve done lots of work, so what was the result? Is directionality easy to hear as MC says, to the extent of 80-90% correct identification in blind tests?
I admit this is a difficult question, the percentage of hits depends on many things. First of all, if we are talking about just difference in the sound of the same piece of wire, then here, with all other things being equal, the percentage of hits easily fits into 90% and sometimes 100% . Equal means that we must listen to the same piece of music, connect the test wire to the circuit in the same way (the same contact points of the test wire with the circuit) and hold the wire with our hands in the same way.
The problem is that the wire has a transverse component of directivity, and if during testing you connect the wire in the same longitudinal direction but with different sides, the sound will differ, and sometimes this difference can be close in expression to the longitudinal reversal. Your hands also affect the sound when you hold the test wire in them. If you do not know this, then the repeatability in the tests may disappear altogether.
So we have some difficulties even in simplest case, but in practice, it is impossible to listen to the same piece of music all the time and work with the same wire ceteris paribus. Here you should not just hear the difference, but choose the best direction in terms of the sum of the pros and cons of different wires. Each wire in addition to the direction has its own character (coloration) and different musical potential, it happens that a successful conductor in the opposite direction sounds preferable than an unsuccessful conductor in the right one. All this definitely reduces the percentage of hits in practice.
In short - to be sure that the percentage of hits in long continuous tests is within 80-90%, the results should be rechecked with a fresh head. In responsible places, I sometimes do it even twice.
@bluemoodriver
Also, as the Audioholics guy is saying just now on his video, the differences between speaker cables measure at below 0.06dB. Utterly impossible for the human ear to detect. If one cable to another has so little effect, will turning the same cable around have the 10x greater effect needed for any audible difference to be heard when blind? Really?
It is not the difference in electricity signal that we hear while reversing wires. I have explained my point of view earlier.