File:How to connect a speaker for use as a microphone

Description
This video shows how speaker removed from its enclosure can be used as either a speaker or a microphone. This shows how electromagnetic transduction can work in both directions (electrical to acoustic transduction and acoustic to electrical transduction).

See also these videos about Building your own speaker/microphone: http://www.youtube.com/watch?v=v6KRe0lA-OY http://www.youtube.com/watch?v=ytRdbKws-pE