Is there a chart or formula that calculates AWG when you combine speaker wire for single bi-amp runs? For example:
10 awg + 10 awg = ____ awg
... and how do you calculate when you use two different sizes?
12 awg + 14 awg = ____ awg
Maybe there is a calculator or simpler way, but I look at the circular mils (or mm^2) for the gauge of each cable, add them together, then match the sum of the individual cables back to the closest number for the larger AWG.
For example, 12 AWG = 3.31 mm^2, and 14 AWG = 2.08 mm^2.
So, 3.31 + 2.08 = 5.39 mm^2
Closest match = 10 AWG = 5.26 mm^2, so 12 AWG + 14 AWG is slightly larger than a 10 AWG wire.
The mm^2 comes from a wire gauge table such as this one.
Just because there is a knob doesn't mean you should turn it.