Materials:
-a table saw will be best, so you arent forced to try to saw a straight line with a jigsaw.
-a jigsaw or router to cut the speaker hole
-you want SCREWS, NOT nails. you want about 1 screw per 8"
-for your subs, 1 sheet of .75" MDF is enough
-a drill for the screw and holes
-silicone to seal the seams from the inside
-wood glue along the contact edges (optional)
-spray adhesive and carpet for the finish
-speaker connectors, or you can leave those out and just drill a hole for the speaker wires. if you decide to do the latter, be sure to put silicon around the wire so it doesnt create a leak in the box.
what to do:
-find out what dimension box will fit in your truck, be sure to measure the opening. you dont want to be not able to stick the box in there.
-find out how much air space you will need per sub. be sure you take into account the space that the speaker basket / magnet will use, and the board that will separate the 2 subs. since you want 2 different enclosures for the sub, not a single space for shared air.
-start designing your box on paper
-plot out what size boards you will need to cut out, and cut them out most efficiently on the board
-take the board that requires the hole for the sub, and cut that out. most likely your subs should come with a template
-depending on if you are using the speaker wire connectors, you should cut the hole for them out
-predrill the holes for the screw, line up boards and screw in the screws
-if you want before you put the boards together, put a line of wood glue
-wait for it to dry, and put a line of silicon on the inside seams to make the box airtight
-wait for it to dry
-cut and install carpet
-once dry, install sub.
whew, its a fun process.
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