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My civilised rebuttal to fzman is that blind testing and measuring cables (resistance etc) are not crude. Blind testing means only hearing is involved, whereas pro-cablers want other clues. Straight away you can see how that weakens their argument that they can hear a difference. Then cables measurements are straightforward with recognised values. Or do you mean testing cables for some other factor that has yet to be discovered, which would explain pro-cablers hearing a difference?
I agree that if there are audible differences then they should be discernable with only auditory cues. I also think that there may be revealing measurements that might point to potentially audible differences in cables. I lack the technical expertise to say precisely what those might be- just that we cannot rule out, a priori, that there are not physical/electrical phenomena in operation here that we have yet to quantify.
My issue with blind tests has a lot to do with things like test anxiety, and being in a different receptive state when listening to music for enjoyment, vs. being tested for 'hearing acuity', for lack of a better term.