These are the plans for the new box that i'm building for my 2002 Explorer, and yes it will fit.
It's for 4 18" Acoustic Audio 18's, so yes this is a budget build. As in under $800 build...
but here's the specs for the box:
1" MDF all around
Dimensions: 40 x 39 x 22
Port Dimensions: 20 x 37.5 x 3.5
Gross Volume: 16.27 ft^3
Tuning Frequency: 29.41Hz
Port Area: 131.25 in^2
there will be a 1/4 sheet of MDF on top of the face sheet for counter sink...
This is similar to lil_wallbangers 4 18 box as far as port design.
the subs are "Light weights" and only weigh 17 pounds each... but that's all my budget allows. but ill still build the box up to 1 1/2 to 3" or so..
Let me know what you think
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I could not get the images posted so you have to use the links, sorry.