Help! Sub box for back of Jeep Liberty

[Jbabyluds]

Hey y'all, I am wanting to build a box for the back of my Jeep Liberty to go next to my yeti. I have 17 inches left to right, 21 inches of height, and 16 inches of depth at the top of the seat and 23 inches of depth at the bottom. I am just looking at one 12 inch woofer. I want to know if I should go with a slant back design or a standard shaped box and also whether I should go ported, passive radiator (seems really interesting to me I want more info on it) or a sealed box. I want to hit lows nicely. It is one kicker cvr 12. Help! Please haha

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