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

Sorry, I have no picture of that taken.
I'll try to explain.
The ideais to use a short 8 AWG (the thickest wire that can fit into the banana plug) that is going between the banana plug and the 0 AWG cable.
As I said in one of my posts, an 0 AWG can not be soldered. It takes to long till the tin melts. By the time it does, the plastick sleve is damaged and a significant part of the cable's adge is subjected to oxidization.
I use a cable shoe to fit (DIN 70 size) and crimp it with a 0 AWG crimping tool.
https://www.ebay.com/itm/DROF-Mechanical-crimping-tool-for-10-to-2-0-AWG-6-to-50-mm-Made-of-Steel/16...

The 0 AWG is kind of difficult to work with. every step that would be eassy with an ordinary wire (up to 12 AWG) is getting bulky.

I do not use spades. They are not good for contact (it gets lose in time) and every here and there it need's to be fasten. An endless maintenance.

If you are into make one for yoursrlf, I may offer you that service.

Going back for a minute to the JPS cable Add.:
http://www.jpslabs.com/aluminata.shtml
Even though it is a power cable, they state: 60A and 14,000W and 250A and 48,000W. Absolutly impressing...
By the AWG standard (https://www.powerstream.com/Wire_Size.htm) a 60A requires an 8 AWG and 250A a 000 AWG (50% thicker than a 0 AWG. Two are required and a GND). None would fit into that cable, even it looks really thick.
Do you see the nylon sleev? It’s for you not to see what is beneath it.
However, the IEC standard 60906-2 (2011) limits the power to 20A.
Older versions are up to 15A.
https://en.wikipedia.org/wiki/Mains_electricity_by_country
Any liscenced electrician would tell you that. What they state is not legal.
That would end with burned or melted pins on the plug. A house line is also limited and even the 60A needs a 3 phase instalation. The plug showen is for 1 phase. A long story is told there, without any sense to back up the price (?).
I'm just trying to show you guys, what is going on in this dubious industry.
My question, is what is that good for? So is the thing with speaker cables. They will tell you a lot to keep a friday night conversation on the subject, to keep you happy, but not much of the most important and required properties.

Been reading this and find it interesting. I would buy a tinned finely stranded pure copper 0 gauge wire which may actually sound great based on my experience with stranded tinned copper wire from Duelund, Western Electric and Supra. Such wire is available using oxygen free pure copper.  Not sure how I would terminate just yet.

Mr. grannyring
What equaipment are you going to connect, and how long your cable is going to be?
I’ll repeat my say: not all need a 0 AWG! some don’t need a thick cable at all, some do, some need it even thicker. It better be calculated.
It would be a dissapointing DIY project to end it up with no actual sonic benefit.
I’m not saying go 0 AWG it’s the best! I’m saying let’s calculate (engineering!) the right cable and than get it, the first time right.

I understand completely OP. Just looking generally at this topic.

20 feet long. Must run cables under the house to keep it clean looking per wife. Fireplace in the center. Lyngdorf 2170 and Dali Epicon 6. I make cables and do mods as a part time gig.

The 2170 is not going ever 🙂

Based on your way of thinking, which I don’t agree with totally, I would need thick gauge. I use 7 AWG now.   It comes down to personal preference and listening. However I am always open minded and willing to experiment. You need better conductors than your chosen cable in my opinion. Copper clad aluminum is not as good as I would desire. Thus my post here.