might get banned for bumping a old post but meh. im kinda curios i have a 2.0 stereo system and i want to add a sub to my setup. will i have to buy some 2.1 kit that has the orange plug or can i just use a 3.5mm to rca adapter to wire up a sub using the rca ports on back like what a polk psw 10 -psw110 or a cerwin vega xd8s has.