Sound output unit for installation in a ceiling structure

A sound output unit adapted for installation in a ceiling structure having parallel stud boards and a layer of sheet material, said unit comprising:

• a polyhedral acoustic chamber including a bottom plate having an inner edge defining an opening, a top plate and two pairs of side plates forming three pairs of opposite sides for said chamber which are slanted in orientation with respect to another for reducing resonant vibrations;
• a loudspeaker mounted in said bottom plate of said chamber for radiating sound outward from said output unit through said opening;
• a plurality of baffle ribs mounted along the interior of said chamber for suppressing sound reflections;
• a pair of flat sections extending out from said bottom plate of said chamber for mounting said chamber to said stud boards of said ceiling structure, and
• means for mounting said loudspeaker in said bottom plate, said mounting means including a ring extending down from said inner edge of said bottom plate around said opening for forming an abutment to said sheet material of said ceiling, a recessed shoulder extending inward from the inner edge of said plate around said opening for mounting said loudspeaker in said opening, and a cover plate including a screen, said plate adapted for being removably mounted onto said ring from below said opening in said bottom plate.

An assembly for mounting a loudspeaker in a ceiling structure, said assembly comprising:

• a mounting plate having an inner edge defining a circular opening and including a set of fasteners positioned around said opening for locking onto studs;
• means for mounting said loudspeaker in said opening;
• a cover plate for covering said opening in said mounting plate, said cover plate including:
• a main body in the form of an annular ring having a central opening;
• a set of studs extending upward from said main body for engaging said fasteners in said mounting plate,
• a foraminous screen extending over said circular opening for allowing sound to pass through said cover plate,
• means for damping any vibration by said screen.