**** I Wish, It Is If I Remember Correctly 16 Inches From Back Seat To Rear Window, And 40 Inches Inbetween Wheel Wells, And It Can Be As Tall As Whatever, Dont Care If It Is Above The Seats It Can Be Like 20 Tall
are you sure you have 40 inches from side to side? I have a station wagon and I have something around that, but in a hatchback civic? if you really have that much space, I would try to fit 4 10's side by side, with each sub variating position from front to back. 4 12's is going to be awfully tough.