Loudspeaker and method for spreading a sound

A method for spreading a sound, comprising the following steps:

• providing a stationary structure, including a magnetic field generator;
• providing a movable working unit, including a radiator and a movable magnetic element, connected to the radiator;
• generating a magnetic field via the magnetic field generator;
• moving the movable magnetic element responsive to the magnetic field generated, so as to move the radiator along a longitudinal axis;
• guiding the longitudinal movement of the movable working unit via a guiding device, wherein the guiding device comprises an inside surface, extending around a guide axis which is oriented longitudinally, an outside surface extending around the guide axis and surrounding the inside surface to define a gap, and a spring, closed on itself to form a ring, disposed in the gap in contact with the inside surface and the outside surface, wherein the step of guiding is accomplished by rolling the spring on the inside surface and on the outside surface while moving longitudinally responsive to a relative movement between the inside surface and the outside surface, wherein the inside surface is connected to the stationary structure and the outside surface is connected to the movable working unit, or vice versa.