So, I spent yesterday creating a new subwoofer enclosure for my 2 Door JK. I didn't like the box just sitting in the back because it took up useful space that I plan on using for future mods. So, I took my previous store-bought sub box and mounted it right behind the driver's seat.
MDF (Recycle an old Subwoofer Enclosure)
Self Tapping Metal Screws
Loctite water proof sealant
Replacement Auto Carpet