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How Does a Speaker Work?

Mechanism of Sound Production

• The speaker contains a coil situated within a permanent magnet. When an alternating electric current flows through the coil, it generates magnetic variations that cause attraction and repulsion between the magnets.

• This magnetic action forces the cone, which supports the coil, to oscillate back and forth. The vibrations from the thin walls of the cone accelerate surrounding air, producing sound waves.

• The volume of sound generated is directly proportional to the amplitude variation of the electrical signal; greater amplitude results in louder sound.

• Additionally, higher frequencies of vibration produce sharper sounds emitted by the speaker.

Types of Speakers