_Signal_FAQ09_Audio_System - How are loudspeakers,...

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How are loudspeakers, amplifier and equalizer used in an audio system? A loudspeaker is a transducer that converts electrical into acoustic signals. Most loudspeakers work like a motor. However, instead of rotating, the motion is linear. The load that it drives is the air next to the speaker diaphragm or cone which is the most physically visible part of the set up. It functions by having a set of permanent magnets through which a coil can move. The coil is attached to the speaker cone and as it moves, the cone and so the air next to it moves together. The movement of the coil depends on the current passes through it. Thus, as the applied current or voltage changes, the movement will change, compressing and expanding the air next to the cone. This results in the creation of an acoustic wave that travels through air and eventually reaches the listener. Most loudspeakers have impedances of a few ohms, with 4 or 8 ohm being most common. Depending on size, a few to tens of watts of power are needed for them to give
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This note was uploaded on 08/02/2009 for the course ECE EE2009 taught by Professor Prof.c.c.ko during the Fall '07 term at National University of Singapore.

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_Signal_FAQ09_Audio_System - How are loudspeakers,...

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