New idea measuring speaker cable by AWG. Just buy some fairly heavy cable and stop obsessing. If it really mattered you would move your amps and speakers so they could be directly connected/hard wired. For instance, if I turned my monoblocs around they would connect to the speaker terminals with six inches of wire. But that's not good, most of us think speakers need to see some capacitance/inductance load and three or four feet of cable.
Or if you're the obsessive type spend $00000s on some smart arse speaker cable as long as you can afford to pay for.