A speaker which uses two pieces of metallic foil separated by a sheet of dielectric (as opposed to the cone and voice coil assembly on a cone-type speaker). A constant voltage is applied to the foils to maintain a steady attraction between them. As a music signal is superimposed over the constant voltage, the foil moves much in the same way that a speaker cone moves. The movement of the foil causes a disturbance of the air which in turn generates sound waves.
