HOW TO CHOOSE A SPEAKER CABLE?

@akg_ca  "the fatter the diameter of the metal core the better because the electrical resistance between amp and speaker will be lower."

Yes, the outside diameter, where the signal travels, is the important factor of resistance. The core itself can be air, as are some wires. 

Unless you are married to a specific brand, get the purest conductors with the least impactful (on the sound) dielectric, and have at it. For me that is Wireworld Equinox 8. It is composed of PC-OCC copper with Composilex 3 dielectric. I got two 8 foot pairs (for bi-wiring) for $1400 new. Done. 

Worth a look