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
Post removed 
Vtl 250 mono blocks,  speaker is Gradient 1.3  they are 4 feet away from amp,  thank you
All this is eye-of-newt-and-toe-of-frog. Get good, rationally-engineered, not-too-expensive cables (I use Blue Jeans), and keep them matched in length and reasonably short.
Mr. kosst_amojan

There is nothing in your observation to disapprove nor approve anything. 

I'll use Confucius say:

The one who asks a question, may look fool for a few minutes. The one who don't, will remain fool for the rest of his lives.