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

Mr.  khiak
You are welcome. All I'm asking in return, that you share with us your impressions from that exchange. Thanks.
How much did you pay for a set of 2m Kharma KESL Speaker cable?

I did find 5AWG high end bananas. I would like to try the 3/0 cables the OP suggested based on my 20 foot runs and gear. I may try 0 AWG. Problem is the cost to try is $400. I like the sound of stranded tinned copper wire sold by folks like Duelund, Supra, and Western Electric and always wondered if thicker gauge would sound even better based on my long lengths. There is a source for this as thick as 4/0 AWG. If the bananas were stackable I could split the thick conductor into two equal parts and terminate with stacked bananas or a combo of banana and spade. I have not found a high end 5 AWG spade connector however.

If if anyone finds a spade or banana of good quality, very important, that accepts 4 AWG or thicker let us know.

I am open minded to this and if the cost to try was lower I would do it. I would not use anything other than high purity, oxygen free, stranded tinned copper for this however. The strands need to fine. The connectors also need to be of high quality. As mentioned above, one can split the conductor into two equal parts and terminate with a combo of spade and banana connectors.

Here is a link for the 5 AWG banana connectors. Just scroll down to find them.

https://www.douglasconnection.com/searchquick-submit.sc?keywords=Bananas

Here is a link to the stranded and tinned bulk cable I would use. The maker offers all kinds of gauges. I think they were referred to in another post above. I do not know if the wire used sounds as good as
Duelund, WE, or Supra. The Duelund is cryo treated and that does make a positive sound quality difference. I know the OP has a different opinion. I have done comparisons and not sure if he has. My opinion is based on actual testing and listening. I suppose one could send out this wire to be cryo treated.

https://www.amazon.com/gp/product/B0156WDXSM/ref=ox_sc_act_title_1?smid=A1NLNJ4Y2QP8Z&psc=1


One last point.  To effectly reduce noise, especially over long runs, one really must twist the positive and negative runs.  Well twisting this thick cable will give you a very thick bundle! Just something to consider. 

I read through most of the posts and get the notion of the thicker the better for resistance but might have missed references to the inductance and the capacitance that these very thick cables add to the mix. Wouldn’t the additional inductance and capacitance act as low pass and high pass filters, respectively, and cause frequency roll-offs? Was this issue addressed in the exchanges among the "experts"?

Mr. kalali

The thick cable are separates. As so, no capacitance is developed.
Capacitance is defined as the dielectric value developed between two metal plates at a steady distance...
The cables are meant to be as short as possible. There are no extra wire on the floor that get coiled to create inductance.
The Z of such a cable, if any, is negligible. Because the R is so low, capacitance or inductance are negligible.

Thank for your concern.

Mr. grannyring

My solution, as seen on one of my posts, was to use a short 8 AWG agent wire, between the banana plug and the thick cable.
It is also good for the strain relief on the contact point of the cable with the binding posts.

Even if I would find a banana plug that could take a 0 AWG cable, I doubt it if I would use it.

Keep in mind that it is difficult to work with a 0 AWG cable. It is very different then the ordinary 12-14 AWG cables.

Don't twist the red and black cables.