Why And How Do Speakers Use Magnets & Electromagnetism?

Magnetic material and magnetic fields surround us in our day-to-day lives, from the refrigerator magnets to the Earth’s magnetic field to the speakers in our homes, on the stage, in our cars, etc.

Why and how do speakers use magnets? Speakers are transducers of energy that convert electrical energy (audio signals) into mechanical wave energy (sound waves). Many speaker drivers utilize electromagnetism to turn the AC voltage of the audio signal into diaphragm movement within a magnetic field to produce sound.

In this article, we’ll have a closer look at how and why speakers use magnets and discuss the various speaker-types that use electromagnetism to convert audio into sound.

Magnetic material and magnetic fields surround us in our day-to-day lives, from the refrigerator magnets to the Earth’s magnetic field to the speakers in our homes, on the stage, in our cars, etc.

Why and how do speakers use magnets? Speakers are transducers of energy that convert electrical energy (audio signals) into mechanical wave energy (sound waves). Many speaker drivers utilize electromagnetism to turn the AC voltage of the audio signal into diaphragm movement within a magnetic field to produce sound.

In this article, we’ll have a closer look at how and why speakers use magnets and discuss the various speaker-types that use electromagnetism to convert audio into sound.

Why And How Do Speakers Use Magnets & Electromagnetism

Why And How Do Speakers Use Magnets & Electromagnetism

Magnetic material and magnetic fields surround us in our day-to-day lives, from the refrigerator magnets to the Earth’s magnetic field to the speakers in our homes, on the stage, in our cars, etc.

Why and how do speakers use magnets? Speakers are transducers of energy that convert electrical energy (audio signals) into mechanical wave energy (sound waves). Many speaker drivers utilize electromagnetism to turn the AC voltage of the audio signal into diaphragm movement within a magnetic field to produce sound.

In this article, we’ll have a closer look at how and why speakers use magnets and discuss the various speaker-types that use electromagnetism to convert audio into sound.

The magnet of the moving-coil driver, along with its pole pieces, possesses an odd shape.

The conductive coil is cylindrical in shape and must be suspended within a cylindrical cutaway in the magnetic structure.

To achieve maximum efficiency, the magnet must have opposite magnetic poles to the interior and exterior of the coil. This allows for a concentrated magnetic field around the coil.

As the electrical audio signal is passed through the voice coil, a magnetic field is produced in the coil, and the coil/diaphragm move within the permanent magnetic field that is provided by the magnets.

This is ultimately how the moving-coil dynamic loudspeaker acts as a transducer. The diaphragm movement mimics the waveform of the audio signal and produces sound that represents the electrical audio signal.

The magnet of the moving-coil driver, along with its pole pieces, possesses an odd shape.

The conductive coil is cylindrical in shape and must be suspended within a cylindrical cutaway in the magnetic structure.

To achieve maximum efficiency, the magnet must have opposite magnetic poles to the interior and exterior of the coil. This allows for a concentrated magnetic field around the coil.

As the electrical audio signal is passed through the voice coil, a magnetic field is produced in the coil, and the coil/diaphragm move within the permanent magnetic field that is provided by the magnets.

This is ultimately how the moving-coil dynamic loudspeaker acts as a transducer. The diaphragm movement mimics the waveform of the audio signal and produces sound that represents the electrical audio signal.

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