LOUDSPEAKER APPARATUS

There is provided an apparatus (100) comprising: a surface (102) arranged to be mechanically displaced; a first permanent magnet (110) coupled with the surface; at least one supporting member (106) for supporting the surface; a base (104) comprising a second permanent magnet (120) arranged to at least partially face the first permanent magnet at a distance; a coil (122) coupled with the second permanent magnet; and a signal port (130) electrically coupled with the coil, wherein an electrical signal is configured to travel between the signal port and the coil, wherein a magnetic field between the first permanent magnet and the second permanent magnet causes a force to the surface, wherein an entity, comprising the surface and the at least one supporting member, comprises at least one elastic element providing a supporting counterforce acting as a counterforce to the force caused by the magnetic field, causing the surface to be in a force equilibrium state, and wherein the electrical signal in the coil is proportional to mechanic displacement of the surface when the force equilibrium state is broken by the electrical signal in the coil.