How to Make a Speaker at Home - Using Plastic Bottle
How to build a speaker with a cup, a wire, and a magnet.
How to Make a Speaker : 18 Steps (with Pictures) - Instructables
Make Your Own iPhone Speakers with a Paper Towel Roll & Two Keg Cups | OSXDaily
Cup Speaker: Physics & Sound Science Activity | Exploratorium Teacher Institute Project
My homemade speakers. : r/woodworking
For next to nothing in cost you can make a simple and effective home made speaker for your smartphone from two Styrofoam cups and empty toilet paper roll. In fact a simple
How to Make Your Own Speakers: 12 Steps (with Pictures) - wikiHow
How to Make Your Own Speakers: 12 Steps (with Pictures) - wikiHow
DIY phone speakers that rock (and a few to avoid) - CNET