Bose Corporation

William J Keezer

Timothy Holl

Christopher B Ickler

William R Short

J Richard Aylward

A mount for mounting a loudspeaker in a room boundary structure having an outside surface away from the inside of the room includes a frame constructed and arranged to rest on the outside surface. A spring has a first end attached to the frame and a free second end. The spring is constructed and arranged to exert a unidirectional force toward the outside surface whenever the second end of the spring is displaced from the outside surface toward the inside of the room.

Loudspeaker installing

A sound projection apparatus for a video display device having left and right speakers, first and second ambience speakers, and an amplifier having a right channel and left channel. In this system, connection of the left channel to a speaker produces a left signal; the right channel to a speaker produces a right signal; the left and right channels to ambience circuitry produces an ambience channel; the ambience channel to the positive input of the first ambience speaker produces a first ambience signal and the ambience channel to the negative input of the second ambience speaker produces a second ambience signal. The left and right speakers are forward facing, projecting sound directly from the television to a viewer. The first and second ambience speakers are side or rearward facing, projecting sound indirectly to the viewer. The projection apparatus may be formed as a single cohesive unit, within or near the television.

Video sound

A circuit controls the sound pressure level produced by a separate bass transducer in a multi-channel audio system having a number of upper frequency channels such that the perceived frequency response of the system remains substantially constant.

Enhancing bass

A loudspeaker driver has a molded plastic basket and a stamped octagonal front pole plate of low reluctance magnetic material molded into the base of the basket. The break edge of the stamped pole plate is used as an undercut for encapsulation. A similar rear octagonal pole plate is employed.

Electroacoustical transducer

A loudspeaker driver has a molded plastic basket made of thermoplastic polyester with 20-30% glass fill and a stamped octagonal front pole plate of low reluctance magnetic material molded into the base of the basket with a keyed central bore. The break edge of the stamped pole plate is used as an undercut for encapsulation. The basket is formed with three tabs spaced equiangularly about the periphery for attachment to the baffle. Accurate upstanding rims extend between the tabs for making engagement with rim segments in a baffle to effect an essentially fluid-tight attachment of the driver to the baffle using snap-in techniques. The tabs are also formed with openings for accommodating screws or other fastening elements to fasten the driver in place with more conventional techniques. Radial ribs extend downward then radially inward from each tab. An exceptionally flat annular surface is just inside the tabs for accommodating the edge of the diaphragm or cone, the roll of which may be either concave or convex. An intermediate portion of the basket extends downward and inward toward the axis of the basket to a second exceptionally flat annular surface for accommodating the voice coil spider which may be fastened thereto by applying heat through the peripheral edge of the spider to the flat surface, causing the plastic material to liquify, flow through the porous material of the spider and solidify when the heat is removed to securely attach the spider to the flat surface.

Growing community of inventors

Sherborn, MA, United States of America

William J Keezer