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5. He decided, unfortunately without any controlled listening tests, that said parameters were equal capacitance and inductance. And travel velocity of all the frequencies in the wire. He has accomplished these (he says) and says this is his main pitch: not that he can prove any of this make sound better. In other words, he is selling optimized objective measures of cables for audio.
Many hurdles indeed.
The first one is "does the cable measure significantly better? If so, in which aspect?"
If and only if there is a positive answer then The second question is "is the difference actually audible?"
Assuming we have a positive answer for the second question, and that would be somewhat surprising by itself, we could move to the third question "is it actually better?" where the only test would be similar to the loudspeaker preference blind test.
We then, very hypothetically, would end up with something like
"among the subset of audiophiles who can reliably detect a difference, the preference goes to..."
Now, let us be generous and imagine the three questions above have received a conclusive answer and that the speaker cable manages to improve the preference rating of one speaker, where does that lead us? Not very far I am afraid.
If, for example, the cable brings so-so speakers closer to the Harman curve, what does it do to speakers that are already there? Degrade them?
Until a fancy cable manufacturer comes up with a serious controlled test (they are the only party who would benefit from one aren't they), there is just no point...