Step 1: What You Need...
2. Sheet of regular paper
3. 2 business cards
4. A Piece of cardboard larger than the plate
5. Magnet Wire (preferably 30-32 gauge)
6. A neodymium magnet. I got mine from CMS Magnetics
7. Scotch tape
8. Hot glue
Step 2: Build the voice coil
TIP: Be sure you don't tape the paper to the magnet. Only to itself.
Then wrap the other piece around the first and secure it with tape.
TIP: Be sure you don't tape the second band to the first, only to itself to secure it.
Step 3: Finish the Voice Coil
TIP: Tape down the first piece so it holds as you wrap.
Try to wrap it tight. Then tape the final result securely with scotch tape. Remove the magnet.
TIP: You can use a multi-meter to check the ohms. You want to get as close to 8 ohms as possible. You must remove the enamel off the ends of the wire to make contact and the easiest way to do that is to burn it off with a lighter.