I might've put too much info into the title, but long story short I wanted bass and wanted to retain both of the jump seats, so my friend Mike (thanks man) and I took out the passenger side cubby shelf, cut a box out of MDF, and put in an 8" sub
making the box was a series of trial and error; starting with the floor of the enclosure, then cutting out pieces to fit around the humps and curves of the xtracab sheet metal
for a sub, we chose an elemental designs 9kv2 because it performs well in a small box, we couldn't really fit a bigger sub using an mdf box, and can get them for a relatively good price ($75)
here is what the final product looks; note the sub is flush-mounted into a piece of 1/2" mdf and sitting on a "ring" which is internally braced for strength, and sealed off with liquid nails on the inside (and a little on the outside)
here's the back side with the terminal
the sub fit was a little tight; I couldn't get the seat down all the way, and it sticks out a couple inches in front of where the cubby would've been, and we can't get it under the factory carpet
so we:
-made slits in the carpet so it could lay flat against the floor
-removed one of the cubby-hinge covers
-decided to carpet it for cosmetics sake.
-the sub sits pretty flush as it is, but I plan on putting a waffle grill on top for full protection later on
getting a carpet match is pretty much a crapshoot, so I just went into wal-mart and checked the auto, bath, rug, and home sections in search of something nice
the best I could find was a nice micro-fiber throw towel, which I felt bad about cutting because it was so soft- $8
I used a spray adhesive to stick it on, but lost all motivation and patience once I got the top and front covered....so I just cut off the excess and stuffed the rest underneath the box
here's how it came out (the color match is accurate in the photos, but you can't see the plush nature of the fabric)
I don't mind that the box didn't go all the way to the back of the truck because I can still fit my spare tire tools behind it
and in this side shot you can see where I half-assed the carpeting
let me know what you guys think
we might end up glassing the sub for a tighter fit, so if anyone's interested in the box down the road, let me know