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Can someone explain parts of a speaker to me for a school project?
Wiki User
∙ 12y ago
The frame to which all parts are mounted, is normally made from steel or aluminum; like a cone with the top cut off. Normally circular it has a large ring on the front and a smaller ring behind it.
The shaped magnet is at the centre back of the frame mounted to the small ring. It has a post that extends a small way forward toward the centre of the large ring.
The coil is wound on a tube that fits loosely around the magnet post. The ends of the coil are attached to highly flexible braided wires which are, in turn, connected to terminals mounted on an insulated plate attached to the frame.
The diaphragm is also a cut off cone shape, made of stiff card or a thin plastic and is attached in the centre to the coil tube. It is attached to the large ring by a thinner flexible membrane.
A small dome is fixed in the centre of the diaphragm.
When an electrical current is passed through the coil an electromagnetic field is produced. Depending on the polarity of the current, this field either works with or against the permanent magnet field and causes the diaphragm to move in or out.
The movement of the diaphragm changes the air pressure in front of it. Change the current polarity fast enough and sound will be produced.
Increase the amplitude (size of the signal) and the diaphragm will move further. Moving the air a greater distance will make the sound louder.
Increase the rate of change of polarity (frequency) of the current and the diaphragm will move faster and the note will be higher.
As the frequency of the signal increases there comes a point when the stiff diaphragm cannot respond fast enough. The dome at the centre is used to help cope with these higher frequencies.
Wiki User
∙ 12y ago
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