Abstract: The invention concerns a rephasing device for compression drivers and dome-shaped, direct radiation loudspeakers that comprise a magnetic circuit with a vibrating diaphragm (11) having a dome-shaped part (11?), and a rephasing device (12) made of a non magnetic material, placed in the concavity of the dome-shaped part of said vibrating diaphragm. The rephasing device is supported axially, with respect to the diaphragm, in a movable form and provided with means of adjustment to supply precise adjustment and stability of the distance delineating the volume of a chamber between the diaphragm and rephasing device.

Abstract: A sound reinforcement system is disclosed for the reproduction of wide-range high-power sound, which comprises several loudspeaker enclosures, each containing at least one driver or loudspeaker with an emission throat, a duct with parallel or inclined walls between the emission throat of the driver or loudspeaker and a diffraction slot, and a wave guide that continues from the diffraction throat onwards, consisting in divergent walls, of which the inclination of at least one can be varied. Each loudspeaker enclosure element is equipped with mechanical parts on each side, for its connection to other identical enclosure elements, positioned vertically one above another and horizontally alongside one another, for a variation of the inclination of each enclosure element on the vertical plane, regulation of the wave guide aperture on the horizontal plan and regulation of vertical and horizontal sound dispersion.

Abstract: A sound system employing wide band loudspeakers, which includes one or more loudspeakers constructed to be placed and housed one inside the other in a closed configuration for transporting and storing and to be detached one from the other and positioned in different combinations in a combined functional configuration.

Abstract: The invention regards a method of sound diffusion by means of a horn or reflection wave guide, which includes the transformation of at least a sound emission source into a virtual point source exactly equal to a “real” point source, and diffusion of the sound from the “real” point source, with sound reflection by means of at least one reflecting surface, maintaining equal sound paths from any point of the emission source. The invention also regards a reflecting wave guide with a sound reflection surface positioned in front of the sound emission plane and configured to transform this sound emission plane into a real point source, and at least one reflection surface combined with the real point source for diffusing the sound towards a measurement or listening position.

Abstract: This invention relates to a low frequency loudspeaker (sub woofer), which comprises at least one pair of loudspeakers mounted in the same box, facing in opposite directions and powered as separate elements by signals coming form a single source but having different amplitude and phase.

Abstract: The invention relates to a waveguide loudspeaker with adjustable controlled dispersion which comprises a duct fonned by flat, concave or convex walls round a diffraction throat, and which finishes in a mouth and where reflection can occur before or after the diffraction throat. The mouth is folded back in relation to the throat and has dimensions and shape chosen for the simultaneous application of at least two of the three fundamental principles for sound diffusion, namely diffraction, reflection and absorption. Also, the invention concerns a method to obtain a loudspeaker having means to vary and set at least the degree of diffraction and reflection for the reproduction of wide bands of mid/high frequencies with a limited horn or waveguide length.

Abstract: A sound system employing wide band loudspeakers, which includes one or more loudspeakers constructed to be placed and housed one inside the other in a closed configuration for transporting and storing and to be detached one from the other and positioned in different combinations in a combined functional configuration.

Abstract: A system for sound diffusion, particularly at low and infra-low frequencies in rooms used for the reproduction of music and speech including at least one large horn enclosure and an architectural structure with a continuous or intermittent “multi-hemicylindrical” surface. The surface covers the walls of the room, for the diffusion/reflection of the sound in a broad spectrum of frequencies and with absorption that is adjustable at least at the low frequencies.

Abstract: A system for sound diffusion, particularly at low and infra-low frequencies in rooms used for the reproduction of music and speech including at least one large horn enclosure and an architectural structure with a continuous or intermittent “multi-hemicylindrical” surface. The surface covers the walls of the room, for the diffusion/reflection of the sound in a broad spectrum of frequencies and with absorption that is adjustable at least at the low frequencies.

Abstract: The present invention involves a moving-coil electrodynamic electroacoustical transducer, comprising a disk made of a hard, nonmagnetic material (12), which is superimposed on the diaphragm (11) and has openings for the output of sound, a power-factor-improvement device/super charger (13) made of a nonmagnetic material which is placed in the concavity of the diaphragm (11) and which has annular, concentric ducts (13') having a conical shape, and a cover (14) made of a nonmagnetic material serving as the lid in both configurations of the transducer, the said cover being applied to the body facing the concavity of the said diaphragm in a direct-radiation transducer, while it is applied to the body facing the convexity of the said magnetic disk (12) in an indirect-radiation transducer.