No one actually knows how to lculate what speaker cable they need

Mr. conradnash

Regarding purity of cooper: https://en.wikipedia.org/wiki/Copper_conductor

Please pay attention: "Specially-pure Oxygen-Free Electronic (OFE) copper is about 1% more conductive".

The difference between OFC and cooper is: "0.02 to 0.04%".

"The main grade of copper used for electrical applications is electrolytic-tough pitch (ETP) copper (CW004A or ASTM designation C11040). This copper is at least 99.90%"

This is the cooper wires industry standard! So a 0.02 to 0.04% in conductivity, over the "at least 99.90% purity", is so negligible that it is absolutely unimportant for a speaker cable or any audio cable! The say had spread like a plague, when there is no disease and no need for a vaccine! A good sales guy had thrown this "barren say" to the audiophiles, who swallowed it and now can't get rid of it.

It is amazing what this industry can convince you pay for, without any justification.

Cooper hasn't changed much since the big bang 13.5B years ago. It changed even less since 1980's till now. No matter how good you get, beyond the standard purity of 99.90%. All the difference in conductivity is below 0.1% and no one would notice an audible difference in such a small difference in conductivity. I'm sorry if my say spoils your sales. I realize that when this thread will take off, you might be out of business.  

What is that say of cryogenically treated or controlled directionality are doing in my thread? Those are some of the biggest schemes of the cables industry. What about doing some burn in and the skin effect? They can help too, after deep mud walking in total ignorance.

Why bringing back your long rotten urban myths after they were grounded to thin dust?

Again, sorry if my say spoils your sales.