The use of type SOOW cord is elegant because it firstly is waterproof and very flexible. Using AWG 10, 4-Conductor means one piece of rubber from amplifier chain to the speaker terminals. This, is because you are bi-amplifying on the same speaker housing. Professional sound reinforcement contractors tend towards the SOOW solution as it is the neatest to bind and solves the voltage drop issue. Usually, SOOW is found in power cords, where the "3-Conductor" variety serves. Bi-amped speakers go real well with the
"4-Conductor," (RED, BLK, WHT, GRN), and the choice of inner and outer insulation(s) (different, but unique) makes for a good assembly dressage.