Thanks for the note, @mofimadness . Always nice to have options from a first class source like Canare..
As I understand it, oxygen changes the crystalline structure of the copper cable. OFC has fewer crystal boundaries for the signal to cross.
I suspect that the OP would be better off by running both positive and negative terminals in the same cable. As I understand it, the whole point of the star-quad configuration is to minimize both broadcasting of an EM signal and receiving an EM signal. I don’t see how that happens if you use one cable for positive and another cable for negative.
Also, running one side in each of two cables is going to considerably increase inductance, which will attenuate high frequency. That’s fine for woofers, but not for full range.
IMO.