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
Yes,  the terminating the 0-3x0AWG conductors will be the challenge in these DIY efforts.  
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@kosst_amojan 

I don't know if a DF of 500 is considered high, but if it is, please listen to the CH Precision M1, you may be surprised how well this one sounds...not that lousy at all. But then again, that is only my opinion, you are at liberty to disagree...