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


It goes back to cable manufaturars, mostly provide no relevant data! to sales and the users. None will answer this!
Whay do you think that you own now the optimal cable to your setup?
I think I've figured it out. 


128x128b4icu
@b4icu I have not had the chance to compare the FM Acoustics directly to the CH Precision using the same speakers. It’s a known fact that FM Acoustics produces very nice electronics, they have been around for many years as well. I’m quite sure that a full line up of FM Acoustics would perform very well indeed, and so there are still quite a few other manufacturers who produce very nice equipment at the highest level. The point is that they are not always available in the country of residence, so choices are not always as divers as in other (your) countries. What I usually do is use electronics from the same origin, so either a full set up of brand A, or a full set up of brand B. That’s the reason I currently play with C1/X1, D1/X1, L1/X1, M1 all made by CH Precision. (Only the bass towers use Gryphon dedicated amplifiers). Cables are either by CH Precision or Gryphon. Only the speaker cables are made by Kharma, and are also the oldest components in the line up. Usually a manufacturer will do its utmost to "tune" the components to each other, and often a combination of such equipment may perform better than a mixture of different brands. Another point to consider is that it also looks good, to me that’s important too. Speakers may be an exception, and are of a different brand. (Gryphon Pendragon). Sorry, this is a little off topic, but as you had asked for it ;)
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He keeps banging on about damping factor too when it is NOT predictive as to how an amp, cable, speaker will sound. In fact, damping factor means nothing. To my ears, those amps with the highest DF sound like (your favorite scatological noun here) because they implement excessive feedback to control an otherwise unstable circuit!
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Mr. stevecham

It is not me to invent DF or plant it into your amplifier you already own. If your DF is achieved by feedback, it is the amplifier designer and maker's choice and not mine. This thread is not about modifying a given amplifier's DF to make you happy. All here have an Amp. with a given DF, whatever it is.

There is nothing wrong if a well designed amplifier has a high DF even if it is achieved by feedback. Feedback is not a bad word. Some excellent stuff out there is just made like that, to include the M1.

Whatever you like it or not, getting a cable by others experiences (more or less, whatever they might say) or by a listening judgment is so wrong. A speaker cable shall be tailored by the amplifier it is connected to, with calculated values and characteristics. Not empirical guess or a blind listening cession. Sorry if that is against your convention. See no issue for you to try it and hear it by yourself. For those who already did, it is a win-win situation.