Abstract: A loudspeaker unit for producing wide dispersion sound for use in wide imaging stereo has a plastic case defined by a front onto which a separate sound mirror fits, and a back. A drive unit fits into a housing located opposite to the sound mirror. A frame of metal or other rigid material provides a mechanical connection between the drive unit and a load-bearing plinth on which the sound mirror is supported. The case front and back together define an upper space behind drive unit that is connected to a lower space beneath the sound mirror by a passage behind a wall of the case front. The three spaces provide a combined volume of gas that provides a reflex load for the drive unit. The overall size of the unit can be reduced without corresponding loss of bass frequency response, and, because the sound mirror is separate from the plinth, a range of drive units of different dispersion patterns can be provided, requiring only alteration in the surface profile of the sound mirror.

Abstract: A loudspeaker unit is provided for attachment at an elevated position within a listening space. It has a drive unit for producing a beam of treble sound, and a sound mirror that distributes a beam from the sound unit over a wide angular extent both horizontally and vertically with a generally consistent amplitude of perceptible sound. The unit may further comprise an angled mid range and low frequency drive unit. The unit demountably clips into a support bracket that can be carried by a post or fixed directly to the wall. Signal supply is via connectors in the bracket so that as the unit is clipped in place, the electrical connections are established. The speaker is quadrant shaped when viewed in plan and lends itself to installation in groups and clusters (FIG. 13).