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

Mr. sejodiren says: I use jumpers for my speakers. who needs banana plugs...
Enjoy. The contact with the clamps of the jumper cables are at a very little area. A good banana plug is way better on contact. also less risky if it disconnects or the red wire touchs the black...

The link goes to a 4 AWG cable that claims 500A. by the guage table, a 4 AWG can conduct only 60A cont.
or 135A momentary. Just for the record, not that you need that high current.
I also do not like that they are molded in two parallel lines.

Mr. grannyring, you say: 
"Based on your way of thinking, which I don’t agree with totally, "
It is up to you to accept or decline my say.
Please be kind to acknowladge me when and if you get any (other) explanation or way to calculate a speaker cable. 
As far as my search reached, there is nothing else out there.
Most just embrace the usual: high purity cooper (in electricity nothing is made under 99.5%) creyogenic treat, bi wire, burn in, or exotic snake oil :-)
All non sintific says, that never convinced me to solve the relations or get the true answer. So, good luck with that.

Thanks @b4icu .

I am open to new ideas and do find your ideas interesting. When I say I may disagree I am referring to your chosen cable quality, burn is reality and cryo treatment. Burn in is real and cryo can indeed help the sound. I tend to agree that heavy gauge is usually a plus, not always however. Depends on the rig and listener sonic priorities.

Mr. grannyring
I feel like my idea was not thoroughly understood.
It is not about thickening the wire, the thicker - the better.
It is about doing an engineering calculation, that is based on the equipment spec., to specify the precise guage your system requires. In some cases, getting closer to that guage would get a better sound, but after reaching that gauge, getting thicker with the cable, will not add quality, only get more expensive.
This is not like tuning in with endless try and error, as it is mostly done today.
Your chaise after a specific cooper wire, is not the point. You are captive of cable’s manufacturers promo, with promisses that are not helping your sound getting any better. It is only the product getting more expensive.
It is an awful VFM. 

Regarding your say on Burn In and Cryo, let me get a bit humoristic:
https://www.youtube.com/watch?v=HMGIbOGu8q0
It would get you an idea, what I think about those subjects. Especially at 02:05.

Burn In:

A cooper wire with some soldered ends does not need any burn in. What is it good for? Well, if a dealer had demonstrate or/and sold a cable, for some $3,000.- US plus. And unfortunately, that is not delivering the promised superiority.

What that dealer or sales person can say?

"It will open up and sound way better after a burn in".

Most customers have nothing to say against this argument that have been common and accepted for no particular reason. It is taken for granted. For the sale process, it is done and dusted. Good for the dealer, not so good for the customer. He was satisfied by a fishy story over a good product.

Why playing some music at low volume with those cables, hooked up 24/7 for a week, would do the job better, than giving it a jump start to a car or a truck and get the same amount of current flow in less than a minute?

Cryo: https://ptable.com/

Why would element 29 (Cu) change conductivity properties, over othre metals in this table? Did anyone tested a cable befor and after to say what changed regarding conductivity? For all those says (skin effect and others) to get some nderstanding won’t hurt. None been explained nor proved by an experiment.

I’m happy we don’t live in times of the Maya empire. That could have end with a human sacrify! on the subject...

My ears have heard it over and over. That simple. So obvious as to make the truth of it most secure. Your methods do in fact point to much thicker gauge than normally used in nearly every instance. Look at your suggestions here for proof. 3x0 AWG in my system! Oh my!