I see what he's saying about the crossover, but keep in mind it'll be cutting power output in half.
I get complaints ALL THE TIME for my setup LMAO. Each tower has a 300 Watt powered 8" Subwoofer with two passive 8" radiators. Then a seperate 300 Watt 8" powered sub with a 8" passive radiator. 900 Watts of powered sub