Electric paper cone loudspeakers are also known as woofer. It is mainly composed of two parts: a magnetic circuit system and a vibration system.
The magnetic circuit system consists of a ring-shaped permanent magnet and soft iron, and the magnetic field is concentrated at the gap. The vibrating system consists of a paper cone with a voice coil that holds the voice coil in the center of the magnetic gap. When an audio current passes, the voice coil moves back and forth with the paper cone under the action of the magnetic field force, thereby making a sound.
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