Hello everybody!

I was trying to find some cheap material to buil a new bass box to my car sound system, then it came to me: I find a water bottle near a trash container. Immediately I imagine that I could use it in my new project.
This instructable is the result of this project.
Excluding the price of the subwoofer (I already have it), all the project cost me US$15

Hope you enjoy it as much as I do. And please! Rate it! Thanks!

Step 1: List of Material

1 Subwoofer 12" (inches) diameter
1 Water bottle 12" diameter (maybe you'll need more if your subwoofer requires)
Acrilic blanket (enough to coat inner side of the bass box)
Perforated Hanger Iron
8 Small Corner brace
8 long bolts with nuts and washer
1 smal bolt with nut and washers to tighten the perforated hanger iron
1 female P10 mono connector
1 male P10 mono connector
two way cable
Silicone Glue to seal

Tools:
Scissors
screw driver
jigsaw
plyers
soldering iron

Step 2: Assembly

Folow these steps to assemby your bass box:

1 - With a jigsaw, remove the bottleneck of the bottle (of course).
2 - Bend and cut the perforated hanger to fit the circunference of the bottle. Fix it with bolt and nut.
3 - Place the corner braces in position fixed by the perforated hanger as seen on the picture, matching the subwoofer holes.
4 - Coat the inner side of the bottle with a layer of acrilic blanket to minimize sound reverberation effect.
5 - Prepare the wiring, soldering the two way cable to the P10 female connector.
6 - Make a small hole near at the bottom of the bottle and fix the female p10 connector on it.
7 - Connect the cabe to the subwoofer before fix it to the bottle.
8 - Before fix the subwoofer, use the silicone in the bottle inner border.
9 - Place the bolts in the subwoofer as seen on the picture
10 - Place the subwoofer in the bootle, inserting the bolts in the corner braces holes
11 - Screw the bolts with washers to tighten the subwoofer against the bottle.
12 - Tighten the bolts in sequence with small steps to keep the balance of the tight.

Important Tips:

* As you already know, for speakers (especially woofers) to work properly, they must be in the proper size enclosure. The manufacturer can give you the required enclosure volume.
In my case, I needed 1 cubic-foot = 28,3 liters.
* You can attach more than one bottle to reach the perfect enclosure volume
* Enclosure Types:
When laying out a system, you need to decide what type of enclosure to use. No enclosure is magic.

A sealed enclosure will be the smallest (for a given response shape) and will have good low frequency extension but may not have the best low frequency extension. If space is limited, this may be your best choice.

A ported enclosure will generally have a better low frequency extension for a given response shape (alignment) but would require a larger enclosure. If you made the enclosure as small as the sealed enclosure but ported it to gain the low frequency response, the output would deviate from the desired flat response.

A bandpassenclosure can sound good and give you a flat response but most of the generic bandpass enclosures are not designed for a flat response. They are designed to impress you in the stores. This means that they are built to produce a large peak at some frequency near 60hz. These enclosures will work well with something like rap music but generally won't sound good with other types of music. If you use a bandpass enclosure, it should be designed specifically for your speakers.

If you're building your first system, I'd recommend a sealed enclosure. It is the simplest enclosure and will be the easiest to get right. A sealed enclosure only needs to be the right size and well sealed.

Step 3: Test and Results

After instalation and tests with R&B, Trance, Rock and others, I cound't be more happy!

The bass response was so good as with a wood box.

I'm impressing my friends: First I ask them to hear the sound inside the car and then I reveal the Bass Box made with a Water Bottle.

The sound is amazing! And It cost me only U$15!

Thank you for rate me!