Length of speaker cables

Mr.  dannad

You spend so many words for nothing. 
Did you ever tried my way?
So many did and the results were fantastic. 
Lets try this one:
Tell me what is your Amp's DF and speaker cable length. 
I'll calculate for you the required #AWG.
Than you implement it.
After listening to the new cable (thick), compare it with the old
cable (thin), we can return to this conversation.
Till then, you are just wasting our time.
You are arguing for no reason, about something you didn't try nor understand. It's an absurd to continue this. Sorry.

Mr. dannad
From study of the cables relation to load (speakers) and drive (Amp),
My analysis point of view is that I need to look into the Amp's output through the speaker cables.
As so, the speakers are not a part of it. It proved to be true, when I used very easy speakers to drive (Klipsch Forte-II) with 99dB/w/m SPL with a 250W Carver Amp.
Or a B&W 802 D, with a 250W PASS LAB. On both, speakers were ignored (as my analysis suggests), cables calculated, tested and proven to be correct.
The definition of DF is for pure resistive values. The cables are part of it.
A thick copper wire has such a low resistance, that the other C and L are irrelevant. So why AC?

Well you can come up with a theory, but it also need to work in reality. 
Mine do.
What about yours?

Answer me: Did you ever tried it?

Mr. dannad

I need to show you nothing.
Parasitic capacitance? My cables are singles. To have capacitance you need two cables (plates). Parasitic capacitance do not apply for my solution. 
You didn't answer my question! 
when you do, we can continue.