The most important part of a sound is the most important duty by the speaker's speaker is to change the electrical signals that have been coming from the amplifier into audio signals. Speakers will need to create a sound that is similar to the original source as much as possible, with minimal distortion. The work of the voice coils using the principle of electromagnetic. By the rules of the ampere, When electric current flows through the coils into the coils. Within the magnetic coils which is iron induced inside bars as electromagnetic. Magnetic North Pole will be normal, and the South Pole. If two magnetic bars are nearby. By bringing the same pole came closer together, it will be pushed. But if different polarity. it will suck. With this basic principle of permanent magnet with coils of steel bars and sound environment. When an electrical signal or sound signal is AC power input signal to noise coils. Internal magnetic pole coils sounds will change the direction of the incoming signal at the switch. Make voice coils move up and down, which will cause the speaker to move about moving up and down and go crashing into the air. A sound wave.
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