Re: The Audiophoolery Thread.
Note that they say their copper wire is 99.999999% pure. That is known as 8-nines purity.
That is either nonsense, or has been assayed very carefully indeed. The only sure fire way of measuring it is to cool the copper to 4K and measure its Residual Resistance Ratio (RRR) which is sensitive to copper purity, crystal boundaries etc (ie anything that scatters
phonons). In fact ultra-pure copper, which has been carefully annealed can give an RRR of 2000. Problem is that it is as soft as lead in that state, and once exposed to the atmosphere it scavenges oxygen and its purity degrades.
Regular ETP copper has an RRR of ~50 and OHNO audio grade copper is ~200.
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