So, you have a cheap pair of speakers, or shitty speakers, or some other type of simple speaker setup that you would like to improve, you can do this really simply; by adding a better inclosure that will give better bass response for almost no money, and a small amount of time. I got a pair of super cheap un-amplified speakers from mycokerewards.com, that
Step 1: Cut your water bottles.
1. ok so first cut your water bottle where the neck starts taper down to the cap. this is visualized in the first picture.
2. then drop the speaker into the part of the neck (once it is clean,so its not sticky and nasty.)
3. measure where it fits snug.
4. mark with sharpie
5. cut with your exacto knife.