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Consumer Electronics by S. P. Bali

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PERMANENT MAGNET

The strength of the permanent magnet largely determines both speaker efficiency and quality of reproduction. The magnet must furnish the most powerful magnetic field in order to maximise the voice coil movement for any given signal. In general, the stronger the magnet, the better the power handling capacity of the speaker, and the better the reproduction.

Woofers are speakers designed to reproduce the bass, or low frequency, portion of the audio-frequency spectrum. For woofers, the designer does not choose the strongest available magnet as adding more magnetic flux will reduce the bass performance of a woofer because the moving system becomes overdamped. The designer, therefore, chooses the magnetic flux level that provides the ...

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