I dont have a DeVille but i do have 4 12 inch subs in a 02 dodge intrepid you can make 2 seperate boxes that look like one kinda like 2 L shape boxes that form a U shape or if you turn them it looks like a T I have a pic it might be hard to visualize
SiX
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WOW- LOL those boxes are Exactly like mine but inverted and flipped.