@zuesman I have seen you write this a few times in various threads.
I can buy 24ga OCC wire for $2.20 CDN per metre. Given one needs 20 strands of this to make a 10ga power cable, the wire would cost me $44 per metre or $88 CDN for a 2m power cable. Given that a company the size of Transparent or Shunyata could buy large quantities of this and get it for a much better price than I, and subtracting the cost of their "cheap" OFHC or OFE C1010, could we assume it would cost them a maximum of about $50 more per power cable? For a $3000 power cable this is negligible. Common sense tells me if it made a difference they would use it.
I understand if someone wants to sell cables and doesn't have an excellent decades long reputation of selling exceptional sounding cables, they will turn to marketing to and throw numbers, figures and terms in order to sell it. If someone thinks they can buy a 7N OCC cable for $50 and believes everybody else who pays more for their cable is getting ripped off they are fools. I am sure there are those who bought a cable such as this one and thought it sounded great because they believed it was 7N OCC copper and that is the only part that matters- the mind is a powerful thing.
Who is able to actually confirm the purity of the copper, anyway? Do we trust the seller/supplier? I see dozens of resellers of 7N copper wire, who audits them?
Or if this 7N copper exists, should we care? is this the same as the amplifier that has 0.001% distortion sounds 100 times better than the one that has 0.1% distortion?
This article is 10 years old now: Roger Skoff on copper purity