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

" I reserve my right, not to give away my formula, at least not for free."

So, if not to make money, just like the cable manufacturers, why not reveal the formula? Or are you just a noble person and the accolades of a half dozen questionable participants good enough for you? 

I assume that you and Mr. kosst_amojan are giving a lot all the time for free and now you are wondering why not all do so?

All you were doing on this thread is giving me hard time with your negative and hostile attitude. Now you think that you deserve to receive the formula as a gift?

Happy dreams.

How is it that someone like the OP can dangle so much nothing and get so much attention?

There is no relevance to what the OP has to offer other than the illusion of some secret sauce. It doesn't exist. The DF of an amp does not define anything, nor does the minimum impedance of a speaker. These factors are not predictive of anything.

And why haven't speaker and amp designers, who are ALL far more talented than the OP, come up with such "calculations" or "standard guidelines?" Because there would be no value.

Ok guys. This is going to end now and here. If your boss, of the cable industry you may represent wish to have a conversation, I'm here. For you: I'm no more available.