Abstract: Electrodynamic horn loudspeaker with thermal dissipation whose operation is based on the pressure variations generated in a small air chamber located in front of the membrane, or diaphragm. This type of transducer is made up of a horn and a driver unit, configured to increase thermal dissipation and comprises a winding, an air gap and a magnetic circuit which in turn comprises pole pieces facing the winding and where the increase in thermal dissipation it is obtained by doubling the heat radiating surface in a single layer of winding and increasing the height of the air gap in the same proportion as the coil, its working range being designed to exclusively cover medium and high frequencies.

Abstract: A folded diaphragm loudspeaker of the type used in the manufacture of audio equipment, includes a first magnetic circuit board having at least one magnet and two pole parts (7) formed from a flexible printed circuit board, where between a folded diaphragm (1) is housed, having folds with a greater cross-section in its most external part with respect to the internal folds, characterised in that the diaphragm (1) is fixed in its entirety to a frame (4), except in one of its ends, where the diaphragm (1) is joined to a rigid support (3) associated with a bowed steel strip or band (2) that tenses the folded diaphragm (1) in the direction of its folds.

Abstract: An improved self-cooling loudspeaker of the electrodynamic type, formed by a magnetic circuit includes a cylindrical permanent magnet (1) and two polar parts (2 and 3), namely a cylindrical “core ring” (2) positioned on the permanent magnet (1) and a “return vessel” (3) having a circular plan view, on which the permanent magnet (1) is placed. The “core ring” (2) includes a plurality of helical grooves (4) on the outer cylindrical face thereof, while the “return vessel” (3) also includes a plurality of helical grooves (5) on the upper part of the inner cylindrical face thereof, matching the grooving (4) of the “core ring” (2).