Speaker driver with two opposite magnets

A speaker comprising a frame comprising a magnetic circuit having on the one hand an external metal casing that is toroidal about an axis and on the other hand a stack comprising a metallic central core placed between a first magnet and a second magnet, with polarities of opposite directions along the axis, aligned along this same axis and themselves placed between a first metal disc and a second metal disc, the central core and at least one disc delimiting an air gap with the casing, the speaker comprising mobile equipment that is movable relative to the magnetic circuit along the axis, the mobile equipment including a spool holder bearing a spool and a membrane, the spool holder being mounted movably through the air gaps, the speaker including a first guide element of the mobile equipment arranged between the mobile equipment and the frame on the side of the membrane relative to the magnetic circuit;

• wherein each metal disc delimits, with the casing, an end air gap, the mobile equipment passes all the way through the magnetic circuit through the end air gaps and the speaker includes an additional guide element, arranged between the mobile equipment and the frame, on the side opposite the membrane relative to the magnetic circuit.