Our project Toyota Tundra continues this month with something no car audio enthusiast should be without: a proper subwoofer system. No other single addition will make more of a difference to the sound of your system, and I've been driving around way too long without one. This particular truck is difficult to fit a sub into, since the power rear window takes up all the space behind the rear seat where a sub would normally fit. In addition, where most trucks have open space under the rear seat bottoms, the Tundra has two storage compartments that are only 6" deep. Getting bass in this truck required some custom work, but nothing that most of you guys couldn't handle in your driveway over the weekend.
Check out the pictures and then go build yourself a sub system that rocks. If you have any questions, feel free to send them to me at sbrown@alpine-usa.com and check out SteveBrownUniversity.com.
 Here's the stock rear seat...  Here's the stock rear seat of the Toyota Tundra. |  With the seat up, the small...  With the seat up, the small storage compartment is visible underneath. |  The stock storage compartment...  The stock storage compartment is only about 6" deep with maybe 0.25ft3 total internal volume |
 Here's problem number two:...  Here's problem number two: The Alpine Type R 10" subwoofer that I'm planning to use doesn't even come close to fitting in the compartment. |  Fortunately, there's plenty...  Fortunately, there's plenty of room under the truck for a sub enclosure, so we need to cut out the bottom of the compartment to get access to this area. |  An airsaw is used to cut the...  An airsaw is used to cut the sheet metal, following the line we made with a felt pen. |
 Next, use an angle die grinder...  Next, use an angle die grinder to smooth the edges of the sheet metal. |  The enclosure can now be formed...  The enclosure can now be formed using MDF. |  Here, the basic shape of the...  Here, the basic shape of the box is formed. |
 A bottom and top are added...  A bottom and top are added to the box to make it airtight. |  The box is positioned in the...  The box is positioned in the truck and bolted in place. |  The original compartment cover...  The original compartment cover was used as the trim for the subwoofer. |
 This shot shows the portion...  This shot shows the portion of the sub enclosure under the truck. |  The original carpet is now...  The original carpet is now wrapped around the subwoofer trim panel and screwed in place. | |