I thought i would post a couple quick pics of my setup for anyone interested in having a sub in an extended cab and still having the ability to use both jumpseats. When i go places with the family i usually take my explorer but it is not uncommon to go somewhere in the ranger with my daughter in the back. I wanted a sub but still the ability to use both jump seats if need be even though i geanerally only use one. This is what i came up with.
The sub and amp i had around from a previous car. The amp i mounted under the passenger seat and cannot be seen. The box was purchased on ebay and houses a single 12" sub. The demensions are: length = 20" bottom depth 7.5" top depth 5" and height 15". The box had .75 cubic feet of airspace. Not a ton but my 12" sounds pretty decent in it. It fits perfect behind the passenger seat and as you can see the jump seat can be folded down and a child can sit there if need be. Only thing i still want to do is add a protective grille to the sub.