"That way lies madness"

you said it

The truth is 12 ga. and 14 ga. will perform and sound exactly the same.

Wires always measure slight lower resistance in one direction vs the other. You want the lower resistance direction to be in the direction of the speakers obviously. I’m not saying that the differences in sound are due to the lower resistance but lower resistance doesn’t hurt, either. The lower resistance is just a clue that wires aren’t symmetrical, electrically or physically. By the way current doesn’t flow through cables or wires. Current is a scalar quantity, it’s calculated from number of electrons which are the charge carriers, over time, I.e., charge over time. For that matter electrons aren’t really moving either, OK, what I mean by that is electrons move but only about a millionth of a meter each time they wiggle back and forth according to the audio waveform. Net electron velocity is therefore zero.