http://www.the12volt.com/caraudio/boxes1.asp

Check out that link.


You have to separate the air space that is in front of the woofer from the air space that is behind the woofer. That means that the rear deck must be sealed off. Many time there are small holes or things like that. They will allow for the air to come over to the other space and cause cancellation.

How big of a woofer are you using? Why do you want to mount it on the deck. I ask because its just easier to find a woofer that will take a small box if space is an issue. I know eD has a shallow sub that only needs a small enclosure.
http://www.icixsound.com/vb/showthre...7&page=1&pp=10

It only needs a .3 - .5 cubic feet enclosure. Thats really small.