I've been thinking about doing this for years and just never got around to it. I apologize if it's already been done but I've personally never seen or heard of it.
Anyway here it is! It's a new driver side storage compartment door with an 8" subwoofer built into it. I know sub boxes are designed with certain spaces in mind but far as I can tell this thing works great! No rattling, crackling, and the 8" provides more than enough bass for the tiny space. Plus there's still plenty of room behind the sub to store things (non ferrous things at least)
In the past I installed an amp for a 12" I had sitting on the parcel shelf but it took up way to much room and was either the sub or the flux capacitor (not to mention WAY too much bass for the car). Obviously the flux capacitor won. I still had the amp installed so I decided tonight I was going to try to build my door with an 8" bazooka tube sub I had.
Dont mind the color, it WILL be changed. The fabric was stripped from the bazooka tube that the speaker came from both so that I knew the piece would fit with fabric, and so that I can use it now . (plus free trumps aesthetics) I'm going to shop around for a more appropriate color.
Shown below is the build process and final product:
1/2 inch particle board to start
Piece cut out with 2 aluminum tabs
Holes cut, tabs bolted on
Component fit up
Fabric glued on
Fabric fitted around holes
Components installed
Next to the original door (there's actually enough room to put the lock on the new door if I want to make it more permanent.
Here you can see the back side
Here is the finished product installed in the car. (Again dont mind the color, I'll shop around for a better fabric in the future)