A short video that explains the physics of a speaker and how it relates to the motor effect (Lorentz force)
CORRECTION: A number of comments stated there is only one magnet (not two as stated)
That is true. The ring magnet has a top and bottom polarity, that with the plates (a center plate and a top plate) set up one polarity on the outside and the the other polarity on the inside pole)
So apologies for my error on the magnet itself. However, the explanation of its working is nonetheless correct.

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