why do we use magnet in sound speakers?

Answer 1

The electromagnetic signal that corresponds to the sound attracts and repels the magnet on the speaker diaphragm... the motion of the diagphragm moves air and makes the pressure waves that you hear.

Answer 2

The way a speaker works is that a coil of wire is wrapped around a cardboard tube, with one end attached to the base of a speaker cone (called a diaphragm) with a flexible rim that is suspended in a metal frame. A fixed magnet is then attached to the back of the frame and the coil (called the voice coil) just barely fits around to the round core of the magnet. When audio signals are applied to the voice coil, the magnetism of the coil changes with the alternating current in the coil. When the magnetism in the coil is applied to the magnet core, this causes the voice coil to move back and forth with the audio signal. This then drives the diaphragm and produces the sound. If the magnet is smaller, it has a weaker magnetic field. If it's larger, it has a larger magnetic field. The larger the magnetic field, the more the voice coil deflects for a given signal applied. This then causes more movement of the diaphragm and a louder sound is produced. So, everything else being equal, a speaker with a larger magnet should be more efficient (be louder for a given input level) and have a higher maximum volume output than a speaker with a smaller magnet. However, there are so many other variables in speaker design (like voice coil size, number of turns in the coil, the materials they're made out of, enclosure design, crossover electronics, etc.) that you cannot necessarily say that a speaker with a larger magnet will necessarily be more efficient or have a higher maximum volume than one with a smaller magnet.

Answer 3

The traditional design is a semi-rigid paper fibre cone and a coil of fine wire (usually copper), called the voice coil attached to the apex of the cone. A "gap" is a small circular hole, slot or groove which allows the voice coil and cone to move back and forth. The coil is oriented coaxially inside the gap made with a permanent magnet. The gap is also where the magnetic field is concentrated. One magnetic pole is outside the coil, whilst the other is inside the voice coil. In addition to the magnet, voice coil, and cone, dynamic speakers usually also include a suspension system to provide lateral stability and make the speaker components return to a neutral point after moving. A typical suspension system includes the spider, which is at the apex of the cone, often of "concertina" form; and the surround, which is at the base of the cone. The parts are held together by a chassis or basket. When an electrical signal is applied, a magnetic field is induced by the electric current in the coil which becomes an electromagnet.

The coil and the permanent magnet interact with magnetic force which causes the coil and a semi-rigid cone (diaphragm) to vibrate and reproduce sound at the frequency of the applied electrical signal. When a multi-frequency signal is applied, the complex vibration results in reproduction of the applied signal as an audio signal.

Answer 4

There are actually two magnets in a common audio speaker. There is one permanent magnet attached to the framework of the speaker, and one electromagnet attached to the cone of the speaker (usually mylar now instead of paper). The wires that go to the coil of wire on the pack of the cone supply the current to an air core coil, which produces an electric field that either repels or attracts to the permanent magnet, depending on the instantaneous polarity. The higher the frequency of the electric current being sent by the amplifier, the faster the field is set-up, broken down, and re-set-up in the other direction, so the faster the cone moves back and forth. Because all the cone does is move air, if it is moved back and forth fast, you hear a high tone from the vibration. Low frequency current, low frequency
tone. Large amount of current, big movements of the coil and cone, producing loud tones, and small amounts of current will produce small movements of the cone.

Answer 5

We use magnets in speakers and microphones because they are a very convenient way of converting the kinetic energy of sound into electrical pulses and electrical pulses back into sound.

A current flowing through a wire generates a magnetic field. In a speaker, an electrical pulse creates a magnetic field which caused a magnet attached to a speaker cone to vibrate by attracting and repelling the magnet, which causes the air around the cone to vibrate, which we experience as sound.

Answer 6

Principle is electromagmnetism. When a conductor cuts magnetic field electricity is induced in the conductor (Fixed magnet). When a magnet is moved near a conductor electricity is generated in the conductor (Fixed conductor).
In speakers magnet is fixed and the conductor (in the form of a coil is fixed to the back of the diaphragm) is allowed to move freely. As the coil is fixed to the diaphragm the movements of the coil is reciprocated by the movements of the diaphragm.
Our voice induces varying current in the microphone and the same varying current is passed through the coil of the speaker hence it moves in the static magnetic field.

Answer 7

Magnate in the speaker cause the coil to vibrate,
As the current in the coil fluctuates due to the differing frequency, with the movement of coil; which is connected to the diaphram, the sound wave is generated.

Answer 8

magnet converts the electrical signals into vibrations which can be done by producing different magnetic fields at diff positions.and the vibrations produce the sound

Answer 9

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Answer 10

because electriciy goes to the magnent which causes the magnent to pull the cone toward itself thus causing movent and sound (basicley)