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

@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. 

Mr. han_n

I think that all the combination of the elements (cooper/silver/gold) is only to have a certain resistance. If that resistance is equal with two cables built different and from different elements, they will sound the same on a given system.

Regarding the feedback of the M1, it is interesting. It might be the strongest sales point of this amp. and for you any setup from 0% to full scale feedback, doesn't make any different. why is this amp. better for you than any other amp.?

Mr. grannyring

I think very different on the matter. A sound of a system should not be played with speaker cables or any cables. Hi-end pushed away the old (70’s) tone controls, EQ and other options to fiddle with the sound, on demand for purity. No distortion, no phase shift and no unnatural effects to the source. So why let some cable, we know nothing about its properties, or how it affects sound take command?

Using ears to measure the sound quality. You may know that our ears are not a measurement instrument. Have you done lately a hearing test by lab? You know that a man’s hearing is dropping with age and may be damaged by some noise to exposed to in the past. This method of accepting someone’s word claiming he has the golden years, would need more proof than a calculation method.

As I said before (I don’t like repeating myself), when a speaker cable has a higher resistance than it should (not optimal vs. the amplification), it disables the system to deliver its full potential. The way I see it, that you play with that figure and practically do more damage than good. Who wants a sound system that he paid for $10,000.- to be used at only 20% or 50%? It’s like throwing $5,000 - $8,000 to the garbage can. I would like to believe that if you put this question to all clients, they would ask for the full 100%.

At a time you have the impression that you are getting someone’s system better, you just play along that range of how much of the optimal sound it will deliver. Even when you apply a cable that you and the customer likes, you may have no idea where are you on that optimal scale between almost nothing to 100%. It is a blind shot in the dark. I would rather take an approach I can deliver the full 100% every time (using some math rather than be depended on someone else likes and experience).

With my way, I can not only calculate, what the optimal cable is, but also calculate a given cable, how good or far it is from being optimal. That may give you an idea of some of your recent recommendations, how close and good, or how far and bad you did.

You never answered me of what is the thickest cable you got in your shop and how much that costs?

However, you did rest my case about no one really know what is the right cable especially those who make them. If I would try several dealers, with different experience and taste to sound, I would end up with as many different cables as dealers. To my perception its wrong!