New structure of loudspeaker

Guy Lemarquand (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans

We present a new structure of loudspeaker: the motor is ironless, the suspension is ferrofluidic, the moving part is piston like, with a concave dome. The absence of iron guarantees a small and constant inductance of the moving coil, as well as the absence of Eddy currents. The motor includes two circular joints, one on each side of the moving coil. These joints are ferrofluidic. They fulfil the guidance and centring function and the air tightness function. This structure is quite rigid. As there is no traditional suspension in this structure, the related non-linearities and hysteresis disappear.

Domaines: Electromagnétisme; Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Guy Lemarquand. New structure of loudspeaker. 120 th Convention, May 2006, Paris, France. pp.6846. ⟨hal-00413286⟩