Quoted from RTS:Do you always have to power both games for the sub to work?
Pinnovators has a mixing kit that will allow four games to work with one sub woofer and allows games to play independently or together with no negative effect on bass.
They provide an auxiliary sound board that connects inside the backbox board directly out to the Polk SW10.
Nope you don't need both turned on. Set the power switch to Auto and it will turn the Sub on as soon as you power up either game.