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

I assume, that my word wouldn't count till now, from your lovely response.

However, maybe this answer from a Swiss respected firm's engineer (CH), would:

"As a loudspeaker cable of a few meters probably has an impedance of more than 10 mOhm, it might actually have a dominant effect compared to the amplifier's output load, at full global feedback".

Even thou in the case of the Gryphon Pendragon , none would apply. But Mr. Loris Stehlé couldn't know that.

I'm amazed that CH official answer didn't involved any of the most preposterous  claims, of that cable's directionality, the skin effect, the burn in or some of the even none relevant of your posts.

Why is it so difficult for you to accept this?

 

@b4icu
First of all thanks for going the distance and trying to help. It's really appreciated. As for the cable, as mentioned before, this cable is an old cable, which I had bought several years ago at a very reasonable price. Any money spent on buying a 12 AWG wire is extra money in my case.  Most likely my current very thick cable won't harm either. The main reason I reacted is for you to show that you don't just talk, but will take the opportunity to TRY to help people. Some may appreciate, others won't. That's okay, accept it as a matter of fact. Of course I know that in my particular case the power amp is inside the bass towers, and I know that for ribbons other rules apply. That's also the reason I haven't spent any money on buying speaker cables specifically for the ribbons. I'm a ribbon lover, (the sound they produce) have used Apogee Grands before. Again, appreciated for the effort you have put in. Did not expect that. 

@b4icu
You wrote "The Bi wire - Bi amp on the Gryphon Pendragon Mid/High unit won't give you any improvement. only cost way more, if you think of another pair of CH M1's ($37,000.- each)."
No, that's a little misunderstanding, I have no intention to buy another pair of M1 amps. Currently I'm using one M1 in stereo mode. Later I will add another M1 and will operate the units in mono mode. So no bi-amping. just mono blocks. The bi-wiring cable is just there because it has been there for many years, not specifically for this set up. I have no intention of buying another cable, just use as is. 

@b4icu
This has been interesting and might I add amusing to read.........OK, I'll play, why not, I might learn something useful.........Bryston 4BST amp, bi-wired to Vandersteen 3A signature speakers. Advertised DF is 500+ if I recall correctly.........Currently using 15 foot runs of Belden 10AWG, two per speaker to single terminal on the amp.............What's your suggestion?