I jus got a system (2 12's, 3000w amp, and ported box), and its hooked up, but the bass wont play thru the aux where my ipod is hooked up. The installers said I needed an ipod plug that plugs into the bottom of the ipod, and plugs into the back of the cd player, but not in the aux port. What kind of plug is it, and what does it look like b/c I already have an rca cable going from my ipod to the aux port in the rear of the cd player. Someone help me out PLZ!