American Trading and Production Corporation

Atlas Sound LP

Michael E Lamm

S Richard Hrach, Jr

Joseph A Ferrante

Thomas J Johnson

A plenum mounted, flat metal panel diaphragm masking loudspeaker includes a flat, stamped sheet metal frame which has a deployed state and an undeployed, flat state well suited to storage or shipping. A large, movable tab at the bottom of the frame is weakened by a series of small apertures and forms a hinge or fold line. Electrical accessories including a transformer, a rotary switch for selecting transformer taps and signal connections are included in an enclosed box mounted on the foldable tab. The flat panel masking loudspeaker is shipped flat in the undeployed state and then the large tab is deployed by being folded outwardly before installing the flat panel masking loudspeaker in a ceiling plenum. During installation, the tab is folded along the hinge or fold line out to approximately 90.degree. with respect to the rest of the masking speaker frame, the entire assembly is then held overhead by the installer and is positioned above the suspended ceiling T-bar supports, within the plenum, whereupon the assembly is lowered or pushed downwardly and is held in place by one or more spring clips gripping the speaker frame and the ceiling T-bar supports. Alternatively, the frame may be suspended within the plenum by one or more small chains from the building trusses. Speaker diaphragm panel materials are preferably limited to those that are light in weight, stiff and substantially fire proof, such as aluminum. The flat panel diaphragm is driven by one or more exciters to produce a substantially omnidirectional polar radiation pattern, evenly distributing masking sound through the plenum area for radiation down into a workspace.

Plenum mounted, flat panel masking loudspeaker system and method for

This loudspeaker system intended primarily for woofers includes an enclosure (10) and a plurality of loudspeakers (16), each loudspeaker including a driver (18) having an axis, with the loudspeakers (16) being mounted in the enclosure (10) such that the axes of the drivers are arranged relative to each other to neutralize the vibration of the speakers.

Loudspeaker system

This mounting assembly (10) for a loudspeaker (30), or similar fixture, includes an enclosure (12) for mounting the loudspeaker (30) to a ceiling (C) or the like. The enclosure (12) includes a wall attached portion (16) having an interior annular flange (20) and an exterior annular flange (22) connected by a peripheral sidewall (24). The loudspeaker flange (32) is attached to the interior flange (20) by removable fasteners (36) and the enclosure is attached to the ceiling by fasteners (40). A baffle (60) is removably attached to the enclosure exterior flange (22) by fixed fasteners (62). The enclosure (12), in one embodiment, includes a fixedly attached closed portion (14) and the enclosure portions are attached to a ceiling (C) by swivel clamping members (50).

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High Ridge, MO, United States of America

Michael E Lamm