Ok thanks, was just looking at them, what brand would you suggest? And.. would you amp the back if I put 6 by 9s in? buy some resonalbly decent (dont know your budget) 4 inches or 6 inches in the front and get 6x9's in the rear, with a middle of the line budget go for brands like kenwood, pioneer or even MTX. that sony sub goes hard i know someone with one in there car so id stick with that...decide weather u want a ported or sealed box then get a 4 channel amp 1000w+ peak and hook that up to yoour front and back speakers aswell