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

@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. 

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.?