A
voice coil (consisting of a
former,
collar, and
winding) is the coil of wire attached to the apex of a
loudspeaker cone. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. The term is also used for voice coil
linear motors, such as those used to move the heads inside
hard disk drives, which produce a larger force and move a longer distance but work on the same principle.