Electrodynamic-fluidic transducer element for pneumatic loudspeaker

Movable assembly for the composite electrodynamic and fluidic transducer of a pneumatic loudspeaker, comprising an axially movable tubular support, one end of which carries the coil movable in the annular air gap of the electrodynamic stage of the transducer and the other end of which forms a nose movable in the neck of an annular contraction of the fluidic stage of the transducer, a nozzle part located opposite the movable nose and including an annular elastomeric stop, the middle part of said support being gripped between two concentric diaphragms separating the electrodynamic and fluidic stages of the transducer, said support having a diameter of an order of magnitude greater than its height, said height being of an order of magnitude greater than the thickness of said support, is made rigid by means of said diaphragms, each formed from a composite hoop which, between said support and a concentric rigid ring, includes an elastomeric collar, adhering thereto and having an axial height of the same order of magnitude as its radial thickness, in order, on the one hand, to ensure the elastic return of the support in terms of its axial movement and, on the other hand, to maintain the circularity and therefore maintaining said nose of said support in a plane.