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Speaker Magnet

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I have seen speakers with two magnets. Bucking magnets are sold.
Maybe adding the second one is only for shielding, not for added magnetism.
A steel cap is also used in addition to a bucking magnet.

The strength of the bucking magnet is not as strong as the strength of the main magnet so the parameters of the speaker are not changed much.
The magnetic field of the main magnet is concentrated inside the speaker and only a small amout of external magnetism needs to be cancelled and shielded.


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