Box Design help

[49willys]

I have a 01 F250 Superduty crewcab and I moved the rear seat 1.25" foward I'm looking to build a sealed box for a JL 12w6. How much clearance should I have from the box to the rear seat I can get about .5". Inside the box that would leave about .25" clearance at the top of the magnet 1" at the center and 1.75 at the bottom of the magnet. Box mesures top w 6.5" bottom w 10.5" L 25" H 16" about 1.42 q ft

Thanks Dave

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[Buck 5,000+ posts]

Just make sure that the sub doesn't hit the back of the seat when it plays because if it does it will mess up the surround.

 

[49willys]

Thanks Buck

Would it be a good idea to use the grill to prevent that? it is a very tight install