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

cleeds1
You're right. I don't think that would make a difference though.

OP
I was and am serious. I have easy access to wire and really wanted your advice. I am in the car audio business and I have a good crimp tool and I can terminate. I plan to try your advice. Do you still think I need 0 guage minimum to see the effects?
Thank you

By the way, in the car audio world for speaker wire thicker is always better just harder to hide.

Solder bare wire to speakers bare wire to custom crossover and form a soldered wire hook for amp screw clamp terminal.  Any suggestions?

Mr. keppertup
It is not a good idea to solder a o AWG wire.
Try to use a cable shoe and crimp it.
I would not solder my equipment's bindig posts to wires...
use banana plugs.

By all means let's boil it down to a subjectivist decision and take all fun out of the equation. Part of the joy is experimentation. 

Signed,
An Objectivist Listener