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

Wire alone cannot possibly cure all the ills or preferences of a given system. The right cabling can help directionally get to the end goal.

Even various 0 gauge cabling will sound different based on the cable’s design and materials employed. A tinned finely stranded copper will sound different than un-tinned stranded copper. The gauge of the strands can impact the sound in obvious ways. Copper clad aluminum cabling will sound far different than any cables mentioned above. All these cables will sound different even if they are all 0 gauge. We haven’t even talked about the outer jacket material which also impacts the sound.

@mitch2 and others know this from experience.

You can see my ads here on Agon. I have built several sets of 7 gauge speaker cables. 12 and 10 gauge seem most popular. I am interested in trying thicker gauge and will test over time. Over the years I have learned that there is no ONE WAY to build anything in Audio that is always the best for all people. The best you can hope for is a recipe that pleases as many Aphiles as possible. 

@b4icu

Sorry you missed some of this tread, explaining that every amp-speaker has its optimum cable, by engineering calculation.

You are in fact correct, I previously had only read parts of the thread, so I went back and read the whole thing. Between ROTFLMFAO and taking aspirin to make my headache go away, I learned there are apparently 3 lucky beneficiaries of the secret engineering calculation that primarily shows just about everyone (except the three) is using speaker cables that are too small. Not sure why 6 pages of posts were required to uncover this sensational revelation but hey, whatever it takes to move the industry forward.

It all started in 1977 (or there about) with Polk Cobra Cable, high capacitance, loudspeaker cable from Japan, followed by Fulton Gold 4ga., then Monster. It is interesting that after 40+ years and hundred of thousands of speaker cables bought and used, that this secret formula has just been discovered and released. This cure all theory is backed by a half dozen experimenters that have given early praise of first impressions. It has been my experience that long term use will reveal warts that go undetected during the initial experience.

@b4icu 
Ok, so let us agree that the wire gauge (cable resistance) is an indicator, and let's say that that has been addressed, so what is your opinion about cable materials, OCC copper, Silver, Silver alloys (Silver/gold) cable construction, possible vibration reducing measures etc. Would you agree that the above variances could possibly result in audible differences? I don't want to touch on other issues like burn in or other possible treatments which are claimed by others to have an impact on the overall sound. 
At least I find this thread interesting, it provides us with another "point of view". It may or may not have been a coincidence that when many years ago when I bought the -most likely- biggest gauge speaker cables on the market, that I heard a real improvement with the speakers I was using at that point of time (B&W 802D with Bryston 7B2). I've used these cables ever since, but as you mentioned before, when using with Ribbons different rules apply. (Just for your information as you had asked some time ago about the global feedback settings on my M1, I have checked and found that many month ago I had chosen 0% Global Feedback. But as mentioned earlier, I could not really hear differences with my ears and my speakers. 
Again, thanks for your contribution, it's one of the more meaningful threads at this moment.