Tools needed for building your box.
1. 3/4 inch MDF wood

2. Measuring tape
3. Skill Saw

4. Wood glue or liquid nails
5. one tube of Silicone Calking
6. Calking Gun

7. inch and a quarter wood screws or brad nails and brad nailer

8. Jig Saw

Steps 1. Choose a sub and look at the spec sheet. It will tell you how much internal volume your box will need. In this video our JL Audio W3 eight inch needs 0.3 cubic feet.

Step 2. Measure the height of your trunk. Then measure a second dimension. In this video we measured depth, because we didn't want to go past the strut bar.


Step 3. Find your last dimension. First we take our height and multiply it by our depth. Before you do that you have to remember that we are trying to find the INTERNAL volume of the box so we have to subtract the thickness of the wood. Since we are using 3/4 inch MDF we will subtract 1.5 inches from each dimension (3/4 inch per side). Now we have to find our depth. On our box we had an angle on the back, so we have to average the angle in order to know our depth. [go to 1:45 on the video] Add the top and bottom together and divide that number by two. Now multiply the height with the depth. We got 59.5. Now we must convert our wanted volume into inches. One cubic foot (12x12x12) is 1728 cubic inches. So We're going to take one cubic foot (1728) and multiply that by the desired internal volume (in this case 0.3 cubic feet). 1728x0.3=518.4 cubic inches. To find our last dimension we will take 518.4 and divide it by 59.5 (our height x depth). We get 8.7 inches, in the video i round up to 8.8 inches to allow for displacement of the woofer basket. Lastly we will add 1.5 inches to our final dimension to allow for the thickness of the wood. Now we have perfect outside dimensions for our box.

Step 4. Cut the wood, I usually start with the side because it's easy to test fit a side into the car in order to make sure it fits. Remember you're going to have to plan how you're going to assemble the box so that you don't change the internal dimensions. I cut the sides to fit on the outside. Then i would cut a large strip of wood with a width of 8.8 inches and cut pieces off for the top, front, bottom then back subtracting 3/4 inch on each of those 4 dimensions, so that the pieces over lap each other all the way around. (hope that makes sense).
Step 5. Cut the woofer hole. Usually woofers come with a piece of cardboard that fits the woofer. Trace it and cut the hole out with a Jig saw. If your woofer doesn't come with a template, measure the mounting lip, double it, then subtract it from the overall woofer diameter. Test cut the hole n a piece of cardboard just to double check your measuring. The last thing you want to do is screw up your box now, plus now you'll have a template for next time.
Step 6. Calk you box. You want to make sure your box is completely sealed, you don't want any air leaks. Also drill a hole and run your wire out, and Calk the wire hole. 

Step 7. After the Silicone dries (24 hrs), Bump it. :)
I usually carpet the box while the silicone dries, but i recommend test bumping it before you go through the hassle of carpeting the box.

Tools needed
1. Carpet
2. Spray Glue
3. Straight Razor Blade

Carpeting a subwoofer box seems easy, but hiding the seems can be dificult. The first thing you want to do is find the right material. We always use "Pro-Felt" with a latex backing. This type of carpet is the industry standard for 99% of all pre-fab speaker boxes. It's very important to use this type of carpet in-order to hide your seems.
Wrapping the box is essentially like wrapping a Christmas present, but instead of folding the corners over, you will cut the excess material off and butt the seems together. The materials we use will be available in our online store once it launches, mid-2010.
Glueing the carpet down can be achieved using different methods. We spray WeldWood contact adhesive out of a pneumatic spray gun. The contact adhesive can also be brushed on. You can also get spray adhesive in a can. When glueing down the speaker box carpet, spray the wood and the carpet wait for it to almost completely dry then stick it down. Watch the video attached to this article to see exactly how the seems are hidden.