Yes my box is sealed. All the boxes I have built are sealed. I make 2 sides about 2 inches longer than the other 2 sides, so that the speaker can fire against the floor. I have spent around $1000 on my complete system, may be a little less. I like good crisp clean sound and base. I like all kind of music. I like Country, Rock, Metal, and some Rap. My system sound good no mater what I listen to. I have found that having the same brand head unit, and amp seams to work best. They are all designed to work together. When you mix match the head unit, and amp, its doesn't seam to be as good.