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

Mr. han_n
I'd call CH Swiss to check about your M1 Amp.:
" Dear Michael,

Thank you for your interest in our products.

The damping factor of an amplifier being the ratio between the connected loudspeaker's impedance and the amplifier's output impedance, we can not publish a single number.

We would need to publish a damping factor for each possible load (like any amplifier manufacturer should), but also for every setting of global versus local feedback ratio of our amplifier (which is user-adjustable on the fly from fully global to fully local, with 9 evenly-spaced steps in between), as this setting has a direct effect on the M1's output impedance.

At full global feedback, the M1's output impedance is measured at 0.013 Ohm. So in a 8 Ohm loudspeaker, this means a damping factor of 615.

At full local feedback (no global feedback at all), the M1's output impedance is 0.09 Ohm. So in a 8 Ohm loudspeaker, this means a damping factor of about 90.

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.

I hope this answers your question.

Best regards,

Loris Stehlé"

If we go for the best I would say that the M1 \'s DF is >500.

But when I looked into your speakers: Gryphon Pendragon 

http://www.gryphon-audio.dk/media/1408/manual-pendragonv2.pdf

I found that the bass unit is self amplified by a 1,000W amp. It is connected to your Pre. by XLR and no speaker cable is required.

The Mid/High unit is a ribbon. So a regular wire (12 AWG would do). Even thou your system is very expensive, you can save big on the cables. :-)

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).

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.