A flat panel speaker. The speaker includes a drive unit made up of a
signal oscillation radiator the winding of which promotes oscillating
rather than translational movement of the radiator. Such a configuration
allows the speaker to operate at a broad range of frequencies. In one
form, the radiator includes a magnet, a coil former and a coil winding
formed around the coil former in such a way that a magnetic field
produced in the magnet can cooperate with a magnetic field induced by a
current that corresponds to an audio signal flowing in the winding to
produce an oscillating force in the radiator that can be converted into
the oscillating movement imparted to the panel.