The first one,
8 cores pure silver and single crystal copper, is 4 cores of pure silver and 4 cores of pure copper where a core is a woven series of individual strands. In other words, this is a hybrid cable where you are getting two individual materials working together to bring the benefit of both. If you look at the supplied IMR Cable (provided you got the copper coloured cables and not the black sheath) it's obvious by looking at it that it is a 2 core copper cable.
Sticking with the the 8 core cable it says 4N Silver and 6N Single Crystal Copper. The letter "N" comes from metallurgy and is short form reference for 9. In the gold and silver trade (and platinum, copper, etc..) 4N, 5N, 6N etc., is a system of fineness grading called the millesimal fineness system which denotes the purity of a metal by parts per thousand of pure metal by mass. So here we have the purity of the metal is expressed at Four 9's, Five 9's, etc.... where each 9 is a 99 point N part per thousand of purity. 3N = 99.9% or 999 parts per thousand, 4N = 99.99% or 999.9 parts per thousand, 5N = 99.999 or 999.99 parts per thousand pure. Honestly when we're getting to these levels we're talking highly pure raw material with infinitesimal differences between 3N and 5N. These numbers start to make (some) difference when trading or accumulating gold and silver but the differences are not that great. In that use case it comes down to what's known in the trade as the "Melt Value" but that a whole 'nuther discussion.
So sticking with the 8 Core cable above you have 4 cores of high purity (no junk metal) silver and 4 cores of no junk copper - in other words, you should get pure transmission and get the benefits of both pure copper and pure silver, unadulterated by junk alloys.
Lastly the number of cores are denoted by how many strands and the thickness of each strand. Continuing with the same cable each silver core is 10 strands of 0.08mm (super thin silver wire) and there are 4 of them. Each copper core is 100 strands of 0.05mm and there are 4 of them
Looking at the
8 Core 6N OCC
it's 999.999 parts per thousand pure. You can calculate the cores.
Of course there are several tangential discussions or threads that come from this:
- The sonic differences between copper, silver, aluminum, platinum and other materials used to transmit sound
- the difference between OCC, UPOCC, etc, etc, copper
- The benefits or disadvantages to blending or coating one metal with another
- Whether cryogenic treatment makes any differnece
But I'm not going to open up any of those cans of worms here! Hope this helps someone