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Are you sure it's the wire which has directionality or is it the insulation?
Cable directionality (aside from asymmetrical construction like a shield connected at one end or "termination" boxes) is actually a very easy one to structure a blind test with. One was actually put together a few years ago, but the claimant backed out.
Here's how to do it:
1. Get a reel of cable.
2. Reel off and cut agreed-on lengths of cable, carefully keeping track of direction.
3. Tag each cable with a tag that reads the same in either direction.
4. Take cable 1. Flip a coin. If it's heads, mark the "toward the inside of the reel" end. If it's tails, mark the "toward the outside of the reel" end. Note the cable ID and which end got the mark.
5. Repeat for a statistical number of cables (15 or so). Give the key sheet to a third party.
6. Now the claimant can take the cables home and using his (pronoun choice deliberate) own system, his own music, his own room, and taking his sweet old time, sort them into two groups by direction versus mark. There are noted on a score sheet which is then sent to the third party with the key.
7. The third party then announces the score and compares to random.
8. Claimant then can spend much time creating imaginative excuses and objections, spawning millions of keystrokes amongst the religiously offended.
Structure a test like this and I'll put money on the line, as long as the claimant does, too.
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"...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011
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