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

B4icu,

You’re genuinely clueless. I’ve built cables. The cables I’m listening to right now are made of 6 fabric insulated 16g conductors in a round braid. I built them to replace single 12g cables of exactly the same length. They sound dramatically different even though the 6 conductor cables are nominally a half wire gauge bigger. That half wire guage doesn’t account for the difference. The reduced induction and twice the surface area of the conductors does.
Whoever told you cables are an extension of the amp lied to you. Cables have inductance, capacitance, and impedance, just like a speaker, which makes them a load unto themselves, be it a relatively minor one. Anything beyond the output posts is a load.
Anybody claiming to build ideal cables for any particular amp, speaker, or listener’s taste is a liar. If you really did invent the formula for ideal speaker cables, the same formula would work for interconnects because a pre-amp driving an amp is nothing more than a source driving a load and the electrical considerations are exactly the same.
Thanks for the nonsensical snake oil pitch, but you make no sense, contradict well understood electrical theory and testing, and speak in semantic riddles that reflect no technical understanding.

Mr. kosst_amojan
Speaker cables are not supose to have any inductive or capacitance values. It is a cooper wire. You wrote: " 16g conductors in a round braid" By putting them into paired parallel lines, twisted 6 fabric insulated 16g conductors, get them some small values of impedance. My cables are two separate cables, so no inductance or capacitance are involved.
You are telling a tell of a wire you made, but how you ended up with that particular value of cable resistance, to fit your system!
Was it a divin revelation in your dream, that instructed you to build those cables, as the rest of the arc?
You call me a liar, at a time you can not tell the diference between an interconnect and a speaker cable.
A power amp. input resistance is usually 10kOhms, and it is pasive resustance. The speaker is 4-8ohms, a complex coil loaded impedance.
Interconnects have a shield to ground and a capacitance developed between the two. Good speaker cables, unless you twist them, have none. An interconnect need to pass milliamps, a speaker cables pass 1000 to 10,000 more current.
Giving a jumpstart with good 4-0 AWG speaker cables would do. Doing that with an interconnect cable...?
Well they are not the same, and bever were.
I’m not a liar, but you do not understand a thing in electronics or audio. 
Calling me that again, will end up with a comlpain and no more answers!

I experience the same results with the silver wire ladder design driving a second system consisting of a Hegel H200 integrate amp driving Aria A speakers (Joe D’Appolito three-way design employing Cabasse cone woofer and Accutron ceramic drivers).
I buy 16AWG naked .999 pure solid silver wire from a jewelry industry supplier in New Mexico for $2.87 per foot and poly sleeve on Amazon for $.14 per foot.  It only takes 30 minutes to assemble these cables (cut silver and sleeve to length, insert wire in sleeve, attach spacers to cables and attach wire to terminals).
Measuring the differences between conventional materials and designs when compared to the ladder described, with instruments other than my ears, is beyond my ken.
Invest $70 and thirty minutes and let your ears be your guide.
For over thirty years, I to, was a cable denier.  I have $9,500 of various unsatisfying cables sitting in drawer or were resold.  I wonder if the measurement sciences have caught up to the reality of how electrons behave when transmitted via different materials, and in proximity to the signal and ground wires.
Happy listening.

Mr. keppertup
Siver has a 9% better conductivity than cooper. It should cost 94 times more. A 16 AWG silver wire would have a very similar resistance to a 16 AWG cooper wire. For the price of the silver ( $2.87 per foot ) you should buy it by the mile and sel by the ounce. 
Your Hegel H200 integrate amp has a Df of 1,000. Very good.
http://www.hegel.com/images/discontinued/H200manualenglish.pdf
That would call (by calculation) to a 2x 0 AWG cable @ 8' long.
How long is your cable?
You might have $9,500.- value of speaker cables that were all purchased without any serious guidance, to become obsolete inventory.
What you need is a set of 2 x 0 AWG, if 8' long, that should cost you less than $2,500.-

OP
You mentioned earlier that Ribbons are an exception. What would you recommend for a Mark Levinson ML3  with a 12 ft run to a ribbon array?
Thank you