To All Cable Deniers, 1 Very Simple Question.

"Result: the too oft-repeated cable debate wars. So it’s up to each individual to face the intransigence that each cohort has absolutely NIL chance of EVER convincing the other side to change their mind."
I agree with this completely. The problem is that the group that denies that cables make a difference seem to think it is their mission in life to "educate" the others, often, in the case of one site, with bile and venom attached. Leave people alone and let them make up their own minds. 
"I have on the other hand had experiences with friends who are cable pilled and they have let me borrow their cables and they even set it up with my system and I was totally blindfolded and I came out of the experiment more staunch in my doubt of cables doing anything"
Well there you go. I have the exact opposite experience, also in blind testing,  and while I agree that other issues such as rooms, speaker placement etc are more important, I have definitely heard some cables making a distinct difference.

In answer to the Op’s question, I do not know if the % of copper makes a difference, but I deffinitely DO know that some cables improve the sound, and these are by far not necessarily the most expensive cables.

@ devinplombier

"Can the OP hear the fuse holders in his presumably very expensive (because you get what you pay for!), elevated high-end audio gear?"

This is a VERY silly response that adds nothing to the OP and is plainly a poor attempt at deflection. Here is a perfect example of someone behaving childishly in at attempt to prove their viewpoint. This is precisely the behaviour that is prevalent in some other fora.

@laoman wrote:

This is a VERY silly response that adds nothing to the OP

What is so silly about hearing the effect of fuse holders, laoman? Everything makes a difference.

You seem to confuse me with a cable denier. Maybe you should read the thread before you start shouting.

To jump in re the Ohno casting of wire, it’s not the resistance variation that matters, it’s the effect of grain boundaries on impedance that matters, as it varies with frequency and affects phasing. Our ears are exquisitely sensitive to phasing with frequency.

Another possibility is that since impurities reside between crystals then zero crystal wire  (Ohno) has none.

If metal weight of the cable is important such as in speaker's voice coils, then the material, purity, conductivity , etc, all should be carefully selected. 

In case of the power cable, as long as thick enough to carry electriacl energy into audio sets, nothing matters. No matter what, the electrical energy flows w/o hesitation, the audio sets don't see any difference of the energy through all different cables. I can not say anybody stupid, if the anybody buys unnecessary expensive cable. Because I do not have any right to blame anybody as long as he/she spends (wastes, this is correct word) his/her own money.

But I am able to say to myself "I am very stupid" if I buy the cables!