Loud-speaker

Claim 1

A loudspeaker, comprising: (a) a casing for accommodating therein speaker units, said casing being enclosed, except for an open front part, by four side walls and a back wall; (b) a sounding horn provided in the open front part of said casing, said sounding horn having a throat opening lying in a plane substantially parallel to said back side wall and being symmetrical about a line perpendicular to said back side wall; (c) a plurality of speaker fitting panels mounted around and behind said throat at an angle to the plane of said throat diverging in the direction of said throat, the forward edges of said fitting panels defining a plane coincident with the plane of the throat opening, and a back fitting panel mounted on said speaker fitting panels, parallel to said back side wall, behind said throat; and (d) a plurality of speaker units intensively mounted on said speaker fitting panels around and behind said throat opening, and a back speaker unit mounted on the said back fitting panel, the total area of the entire diaphragms of said speaker units being substantially equal to, or larger than, the area of said throat opening, the sound wave radiating direction of said speaker units mounted on said speaker fitting panels' being concentrated on a single imaginary point behind the plane of said throat opening, hence within the ambit of the space defined by said speaker fitting panels and on the said line perpendicular to the back about which the said throat opening is symmetrical, and the sound wave radiation direction of said back speaker unit being along said line.