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View Full Version : speakers can double as a mic



93 saturn sl2
11-29-2005, 04:06 PM
How can this be? I have a pair of old computer speakers and they work as a crappy mic. Ive done it with other speakers too.

thylantyr
11-29-2005, 04:09 PM
http://hyperphysics.phy-astr.gsu.edu/hbase/audio/mic.html

A dynamic mic is a tiny speaker.

hoss
11-29-2005, 04:10 PM
works because of the "reverse voltage", or EMF. the movement of the cone inwards and outwards, causing the VC to move back and forth between the magnetic field and creates a voltage. its the same principal as an electromagnet, except working the other way. the voltage that is created carries the same sound reproduction qualities as voltage carried from source equipment to the speaker.

microphones are actually nothing but very efficient, small speakers.