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

8 Ohm nominal speaker impedance +
0.0256 Ohm cable resistance =
8.0256 total nominal amp load.

Amp output impedance 0.016 Ohms
DF (which is a ratio, not units) into 8 Ohms is 8/0.016 = 500
DF into 8.0256 Ohms is 8.0256/0.016 = 501.6

Big difference. Not.

Hi there . For me every thing is simple. Top line speakers as well as amp ,power amp, preamp, cables and ofcours most expensive on entire world . And no question, no more arguments . It must sound good. I might invent something exceptional something extremely good sounding, but who is going to admire it , I got no name. We already have a gurus who are on the top. I should maybe write, money talks as simple. Thank you , nothing to argue about.

Poor wording on my part.  No the cables do not calculate.  The company measures all of your components' parameters and the company builds a cable with a network that that takes all of those factors into account.  Now your search is over.  Sorry for the ambiguity.  

Mr. stevecham

The speaker's 8 ohms is not a part of this calculation.

Your first par. adds the speaker impedance with the cable resistance (like adding bananas with apples!). The concept is wrong.
The speaker's cables resistance is not part of the load (speakers). They are an extension of the amplifier, just as I claimed before.

Your second par. is also wrong! DF is always related to 8 ohms (@1kHz), even if the actual speaker to connected is other (4 ohms or higher than 8 ohms). It is a fix number = 8.

In overall, your way doesn't fit the actual relations, nor explain what different cables sound different. As if you would be right, all cables would sound the same.

Mr. keppertup

Silver has a better conductivity than cooper by 9%. It's cost 94 times more. There is no way you can get a silver wire for $7/feet. Silver's melting point is close to the cooper (about 1,000 deg. C). very hard to work with.

Not the elements inside or other do the difference but the overall resistance.
That could be achieved in other ways too, without using exotic materials.
For the distance, I use two different cables (red and black) that are never in parallel.
All your say is not in line, as I excused non coil speakers from this conversation, and yours are ribbons. (Magnepan MG IIIa’s).