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Electromotive force (emf) isn't the force that drives the speaker. That's just plain two-magnets-repelling-each-other.

EMF is the force that pushes electrons through the wire, generating current. Current through a loop (voice coil) makes a magnetic field that pushes and pulls against a fixed magnet. That fixed magnet is connected to a cone and sound is born :)

glad that's cleared up :)