I wonder why nobody mentioned inductance of the straight wire. It runs in order of 0.5uH/ft and for 27feet of cable it is 13.5uH. At the frequency of 20kHz it represent impedance of 1.7 ohm. Use even lengths for the left and right speakers.
Resistance of the cable is less important - inductor in series with the woofer has around 0.08 Ohm (limits DF to 100). For that reason don't use gauge 10. It won't help and you run into risk of frequency smear since skin effect in copper, as far as I know, starts at about gauge 20 with 20kHz frequency.
Resistance of the cable is less important - inductor in series with the woofer has around 0.08 Ohm (limits DF to 100). For that reason don't use gauge 10. It won't help and you run into risk of frequency smear since skin effect in copper, as far as I know, starts at about gauge 20 with 20kHz frequency.