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

Regarding Mr. Dill’s Q: " What about a double run of 0 AWG wire?
Should be twice as good ...."

The low cable resistance has an optimum value. After that, getting more gauge, would have little or no benefit (sonic) but will cost way more, as more material and labor are involved.

This optimum value need to be calculated. The result, should be rounded up to the next AWG avaliable on the guage table:
https://www.powerstream.com/Wire_Size.htm
Ref. to this table, a 4 AWG cable has a 0.81508 Ohm per 1,000m or
0.00081508 Ohm per 1m to have this as twice as good: 0.406392 Ohm,
requires a 1 AWG cable.
In other words, if you would need a 1m of 4 AWG, by doubling the length to 2m, it would now require a 1 AWG cable. or two 4 AWG in parallel. Two equal resistors in parallel = R/2 (of half the value of one resistor).
If in series, it is 2R (by ohm’s law).

b4icu, I concur about the importance of AWG. You are ripping yourself off in terms of performance by neglecting the power cabling. You have a lot of performance improvements available to you if you seek out aftermarket (or make your own, if you wish) power cords. You are not at the summit. Work with power cords and the system will improve greatly. I do not need to hear your system to know it. 

I know you are quite well versed on the theory. Now, ignore it and follow my advice. You will not be disappointed.  :) 

I am not trying to argue with you, but encourage you to go the next step. 

Copper clad aluminum primary wire for audio? I don’t think so. Terminated into those crappy Nakamichi banana plugs ...

https://www.amazon.com/GAUGE-POWER-GROUND-CABLE-AUDIOPIPE/dp/B0792HLWY6

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.