I saw some Kicker 12" CVR sub boxes. I have 2 of them I just hooked up to try to make sure they work before they go in the trunk. Real nice speakers if you crank the bass on the amp they will really pound but for my music listening they wont be rattling things just making it sound full. Theres so many setting for me to mess with i'm probally going to spend hours in my car trying to gt it ight. Theres Bass, Midrange, Treble adjustments on the head unit and of course the amp for the subs has the bass boost, level, and x-over. I have no idea what to set that at.