He Builds an Homemade Speaker Using an Old CD

Screenshot from the YouTube channel Navin Khambhala # crazyNK

It's more of a cute creative project than an awesome innovative idea but I have to say I was impressed by the quality of the sound that got out of this homemade speaker.

The fact that the system using a CD isn't the main part of the build. It also uses Styrofoam as the base, wires, magnets and some aluminum glued on a piece of plastic for the membrane...