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I use this, and have done for quite a few years
He also sells it unterminated
I use Van Damme 4.0mm Blue, perfectly good enough even with my beefy amp (>500wpc) although just under 5m - and 12m would be 1/3rd of budget
although you mention copper but also Neotech Nemos - I thought they were silver but it may be my lack knowledge?
I mentioned no such thing 
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I have some heavy duty bi wire van damme donāt know if they are 6m runs though
OP
crap forum SW on iPad
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Indeed it is, so why pay foo prices?
I donāt want to start a cable war but am genuinely interested by the above statement and then wanting to buy foo cables?
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A little part of me misses the salad days of the Wam when using the word ācableā in a thread title was like summoning Beetlejuice. Some cnut that hadnāt posted in months would appear within seconds to kick off. Good times, damn good times 
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Some here 6m long. Not my advert just bringing it to your attention.
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Thereās no magic in cable itself, just very well understood physics. I had a 30 year professional career, part of which involved specialising in some rather carefully designed signal transport cables. And my signals could be kilovolts and gigahertz. The trade-offs in connectors are harder to be definite about, although even they arenāt beyond the wit of man.
If you think you might be struggling to measure something then maybe itās worth saving up for a vector network analyser. If this, for example, canāt measure it then thatās because it isnāt there.
As far as costing goes I was a buyer and sometimes a self-builder, but Iām not surprised that sellersā pricing models donāt reflect their costs. I imagine they are much more driven by what they understand the market will pay. Iām afraid the mark-up on extra metres of cable is never going to be āsmallā though.
VB
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