The advantages are obvious: You get more storage space and an original looking trunk, while having an awesome sound.
If you also plan to do this project, I would highly suggest to buy one of those tire repair kits to replace your old spare tire.
All you need is:
- a subwoofer chassis
- a jigsaw
- a buzzsaw
- MDF wooden panels
- wood glue
- damping wool (optional)
- cordless screwdriver
- a car with a spare wheel recess
Step 1: Choosing a Fitting Subwoofer Chassis
You also should decide whether to use a closed enclosure or a bass reflex enclosure. The more space you have available the more choice you have. I had only about 22 liters so I chose a Hertz ES250 Energy with 250 watts continuous power which should do for me. You can check the parameter of my subwoofer here.
Once you have chosen your chassis, you can start planning the enclosure.
Step 2: Planning the Enclosure
One struggle I had to deal with was the annoying pin which lifted from the ground.
Another way of building the enclosure would be using fibreglass, but since I have never used this technique before I started with the easier one. The advantage of the fibreglass method is that you can exploit all of the available space and must not struggle with determined forms.
Step 3: Sewing Out the Parts
I used 3/4 inch MDF panels (medium-density fibreboard) but I think anything likewise will do. Most square parts had been cut by the hardware store. The only thing I had to do was cutting the angles with a pivoted buzzsaw. Be careful when using the jiggsaw. It might easily go wrong.
Step 4: Gluing and Sealing
When the basic enclosure was finished, I started sealing the edges with silicone.
Don't forget to cut out the circle for the subwoofer chassis. Once that the glue dried, I gave the enclosure a last finish by sealing the edges from the inside and the outside and finally drilled a hole for the subwoofer cable on the top.
Step 5: Mounting the Components and Testing
I'm quite satisfied with the result in my car. The closed enclosure produces rich and clear bass and due to the fact that the enclosure suits very tight on the pin, it transfers the vibration very well to the car's body. The best thing about it is that I am able to use my whole trunk, at least if I can manage to build the ground plate in the next few weeks.
I hope you enjoyed my instructable and got animated to start a project by yourself.