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

Mr. Dill, this is not the one you address (Amazone). It is a good 0 AWG cooper wire.
I’ll tell you a secret: All cables are having a nylon sleve over, for a reason: So no one can see what is beneath it.
No one will cut a cable that cost’s a leg and an arm to check it. The cable they use, is no better.
Some are way wors.

Nakamichi banana:
The Nakamichi banana plugs are the best of all I tryed. The part that goes into the binding post, has the best contact area. The same is used in labs. It also can hold wires up to 8 AWG. No other do.
CHORD COMPANY SPEAKER CABLE 4MM BANANA PLUGS (SET OF 2) use the same: http://www.analogueseduction.net/banana-plugs/chord-company-speaker-cable-4mm-banana-plugs-set-of-2....
The Nakamichi are better,

The actual cable, is more than the sum of it’s parts. The genuin testemony of my friend (no commercials) is peaking for itself. Even I was surprised for the good. It simply works and do a big change.

PS. No thanks for solving the attached pictures issue on this site/forum? 

Mr. douglas_schroeder
I oppened this disscusion on speaker cables. Please let's keep it clean from other cables. Thanks.

What I think about the subject?
The power cord has no significance at all in Audio.
It is the last 3’ you tackel, while many are barried in your walls all the way to an AC distribution box and beyond.
No one had shown any scintific avidance, of any advantage of one power cord over the other.
Tell me pleas, if you use a TOTL US $1,000.- power cord connected to your cattle to boil some water, would it make a better tea?
I don't think so. 
You better use some AC filters, if you live at a place that your mains are noisy. That also may do some ON/OFF turn sequence, to guard your speakers from clicks if any.

Mr. Dill
This banana plug is as good as it gets. A friend who was a QA at a large hi-tech firm checked the subject and ended up with those over all others.
The tip is making a way better contact (felxibility and surface ares), than other methodes. It also last longer and can connect directly to an 8 AWG wire. Thicker than most others would. They can get wires only as thick as 12 AWG.

Regarding the cable, it might be some better or more expensive stuff out there. However, the calculations and the results, show no complains.
Why pay more? much more?
What is the market price for a 2.5m (8') long, 0 AWG speaker's cables set?
The last I've hurd of, made by a respected brand (!) was $32,000.-
for a 4 AWG.
They have on the TOTL a 0 AWG too. I assume it is even more expensive. I can get it done and shipped for way less, including an accurate calculation for the best required cable for the system.
Expensive is not a better quality. On a market, that two items will deliver the same, the cheaper will prevail.

Regardles of experience, NONE came out with the answer:
How to calculate a speaker's cable, or even a clue of what cable is needed. I understand it is hard to admit such a thing, at a time claiming of so much experience.
The other ideas were much of let's give it a try and hear if we like it.
Not a sucssesive way to get it right on the first trial. If having experience like that count's I'm out. But I think, it doesn't!
What is a very experienced member? 10 years, 20 years, 30 years...of experience?  I've 45 years. I'm in this hobby since i was 15. 
I orgenized 6 audio seminars, demos, lectures, on the 3rd, Mr. Yair Tamam, founder of Magico speakers gave a speach on speakers...and the list goes on and on.
Experience alone, wont help. Some education in electronics, working with the top Hi-Tech firms, using the ears and mostly what's between them - is more important. The problem (understanding the way how to calculate the speaker's cable by the equipment it connects) is solved. Now it is only for you and other members to accept. Thanks.