Abstract: A bracket for the in-wall mounting of speakers having a bracket frame member configured to receive at least one speaker and also having a plurality of wing members attached to the bracket frame member. The wing members having a thin portion to facilitate attachment to a wall intermediate a wall frame and a wall covering such that bowling or bulging of the wall covering is mitigated and the need to notch or mortise the wall frame is eliminated. The wing members additionally comprise a thick portion which serves as a clamping member. The position of the wing members relative to the frame member is adjustable after the bracket has been installed into a wall without requiring removal of the bracket from the wall.

Abstract: An omnidirectional speaker system includes woofer and tweeter speakers mounted in a concave, curved upper fabricated of a relatively hard shell exterior and a foam interior, preferably plastic. Beneath the upper housing is a base, including a generally conical phase compensation plug which disperses the sound waves equally in all directions through a circumferential aperture between the upper housing and base. In a preferred embodiment, the cross-sectional shape of the upper housing is parabolic and the cross-sectional shape of the phase compensation plug is hyperbolic.

Abstract: An arcuate speaker is arranged for pivotal mounting relative to a vehicular rear shelf plate in operative communication with a cover plate, wherein pivoting of the speaker in communication with a bottom surface of the rear shelf plate effects pivotal displacement of the cover plate for audible access of the speaker relative to an associated passenger compartment of the vehicle.

Abstract: A radio speaker is mounted in an aperture of a vehicle panel having an outerside and underside. A flange is provided the panel underside underlying the aperture. The aperture is larger than the speaker and the speaker is installed from the panel outerside through the aperture to rest on the flange. The flange surrounds only a portion of the aperture to define an opening laterally of the speaker through which the speaker may be removed from the panel underside by movement laterally of the aperture. A fastener is installed from the panel outerside to retain the speaker on the flange and is removable from the panel underside to dismount the speaker from the panel. Alternatively, the aperture may be smaller than the speaker and a series of flanged tabs struck from the panel surrounding only a portion of the aperture so that the speaker may be installed from the underside of the panel by sliding the speaker laterally of the panel to engage the speaker with the flanged tabs.

Abstract: A vehicle loudspeaker system includes a vehicle body having inside surfaces enclosing a passenger compartment. At least one elongated conduit has a proximal portion and a distal portion. A loudspeaker driver is disposed in the vehicle body outside the passenger compartment. The loudspeaker driver has a vibratile surface for generating sound pressure waves in response to electrical stimulation. The proximal portion of the elongated conduit is open to one side of the vibratile surface. The distal portion is open to the passenger compartment. The elongated conduit extends from the vibratile surface into the passenger compartment with an effective length corresponding substantially to a quarter wavelength at the lowest frequency of sound pressure waves to be transmitted between the vibratile surface and the passenger compartment. The loudspeaker driver is characterized by moving mass and an unloaded natural resonant frequency at a first bass frequency.

Abstract: 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).

Abstract: A coaxial speaker system having a high frequency component and a low frequency component is provided with a filtering circuit having an inductance coil securely mounted upon a magnet of the coaxial speaker. Mounting of this filtering circuit permits tuning of the coaxial speaker to provide a desired decibel level over a midrange frequency between the high frequency and low frequency components.

Abstract: A speaker installing holder comprising the device a fixed plate having at least two hook members upwardly projected at its ends, said hook members being detachably insertable into insertion holes formed on a chassis; a vertical wall vertically extended from the inside of said fixed plate; and an inclined wall inwardly extended from said vertical wall in an inclined manner, all the above parts being integrally formed. A speaker can be installed in a simple manner by placing a speaker into the space of the holder body, and press-fitting the hook members into the insertion holes, with the result that the productivity is improved.

Abstract: A speaker grill assembly, which comprises a grill constructed to support a speaker on a wall. The grill includes a body having an opening through which the speaker emits sounds and a passageway through which the body may be connected to the wall. A perforated screen constructed to cover the opening and passageway in the body of said grill detachably is connected to the grill. A pad is constructed to prevent viewing the opening and passageway in the body of the grill while permitting the sound emitted by the speaker to pass substantially unimpaired therethrough. The pad is disposed between the grill and the perforated screen when the grill and the preforated screen are fastened to one another.

Abstract: A compact ceiling mounted loudspeaker system comprising a truncated pyramidal shaped housing supporting an array of four coaxial 2-way loudspeakers. Each loudspeaker is mounted on a respective face of the pyramidal housing so that none faces directly downward. The angles at which the loudspeakers are mounted with respect to the vertical axis and with respect to one another enables the array to produce a flat frequency response hemispherically into the space below the ceiling, with good sound dispersion therein, and with minimal phase cancellation and diffraction effects among said loudspeakers. The speaker system is arranged to be disposed on the grid of a conventional suspended ceiling system to create a space between the suspended ceiling and the surface from which the suspended ceiling is hung to create an infinite baffle to augment the sound produced by the speaker system.

Abstract: An easy to install wall mounted stereo speaker assembly wherein the woofer of the speaker is mounted in the assembly wall frame and the tweeter is both mounted in and self contained within the assembly wall frame. The easy installation requires only that a circular opening be cut in the wall to enable the rear portion of the woofer to extend through the dry wall or sheetrock and two simple holes drilled in the wall to accommodate the support bolts to retain the wall mounted speaker assembly on the wall.

Abstract: A loudspeaker system has an enclosure with a baffle dividing the interior into first and second subchambers. The smaller subchamber is directly coupled to the region outside the enclosure by a port tube. The larger subchamber is coupled to the region outside the enclosure via the smaller subchamber by a port tube. The dividing baffle carries a woofer.

Abstract: An acoustic apparatus comprises a plurality of resonators having different resonance frequencies, each of which is constituted by a closed cavity and acoustic mass for causing the cavity to acoustically communicate with an external region. A housing enclosing the plurality cavities is integrally formed. Resonance acoustic radiation portions of the resonators are arranged adjacent to each other on one side of the housing, whereby sound sources which correspond to the acoustic mass can be concentrated.

Abstract: A modular loudspeaker system of uniformly sized and shaped loudspeaker modules permits hanging of a plurality of the modules in a wide variety of desired configurations. Each module has a pair of side walls with recessed upper and lower marginal edge portions and an integrally formed reinforced connectable structure that spans between the recessed edge portions for reinforcement of the module across its side. When several modules are hung vertically, the vertically aligned reinforced connectable structures reinforce the system along its entire length. Three module types are disclosed, with one type adapted for removable mounting therein of a speaker horn via a quick release hub. Overall, the system provides optimum versatility in adapting to the acoustical requirements of a wide variety of performance venues.

Abstract: A transducer for mounting in an opening (90) defined in a baffle (84) includes an axis and a frame (10) for supporting the remaining transducer components in the baffle (84). The frame (10) includes at least a first finger (40) deflectable toward the transducer axis to permit passage of a portion of the frame (10) through the opening (90). The first finger (40) includes at least one camming surface (52, 54) for resiliently urging the first finger (40) toward the axis as the camming surface (52, 54) of the first finger (40) contacts the baffle (84) adjacent the opening (90) and a locking surface (94) for engaging the baffle (84) adjacent the opening (90) once the camming surface (52, 54) has passed completely through the opening (90).

Abstract: A speaker grille is arranged to have screw seats projected toward a mount opening in a rear parcel tray of a vehicle, and a skirt portion for contacting a surface of the rear parcel tray at a predetermined distance spaced from the mount opening. A holder plate has a fitting projection portion for fitting in the mount opening, a flange portion projecting from the fitting projection portion to be substantially wider than the mount openings so that the flange portion will abut and support a lower surface of the rear parcel tray. The holder plate is screwed to the speaker grille such that the rear parcel tray is clamped between, and supported by, the skirt portion and flange portion.

Abstract: A speaker including a speaker unit, a speaker frame for supporting the speaker unit and a grille unit for covering the speaker frame. The grille unit is bolted to the speaker frame by bolts, and the grille unit includes flaps for covering head portions of the bolts used for bolting the grille unit to the speaker frame.

Abstract: An audio speaker system includes a pair of satellite speakers each having a copper lined pyramidal enclosure formed by four side walls diverging outwardly upwardly from a downwardly facing apex. A speaker mounting support at an upper end of each of the satellite speaker enclosures has a horizontal upper surface through which an upwardly facing speaker is mounted. A plurality of upwardly and inwardly inclined walls connect an upper end of each of the triangular side walls of the satellite speaker enclosures with the horizontal upper surface. A pyramidal speaker grill having four triangular side walls tapering to an upper apex covers the horizontal upper surface and is supported by the inclined walls. A sub-woofer speaker includes a pyramidal enclosure lined with a thin sheeting of copper and has four triangular side walls tapering to an upwardly facing apex.

Abstract: The invention relates to a loudspeaker arrangement in which, in front of the loudspeaker (5) or another sound source, when viewed in the direction of the sound projection, two, preferably plane, sound guide surfaces (2,3) are disposed which, in a bow-like manner, are inclined towards one another at an obtuse angle. The projected sound is better distributed hereby and a good stereophonic effect is achieved. This applies particularly to a stereophonic arrangement with at least two loudspeakers (5).

Abstract: An acoustically shielded speaker enclosure for use in the ear pockets of motorcycle helmets is disclosed wherein parasitic sound waves emitted from the rear side of an enclosed audio loudspeaker are prevented from entering the motorcycle rider's ear and from mixing with and distorting the primary sound waves issued from the audio loudspeaker directed at the rider's ear. The acoustically shielded speaker enclosure consists of a pair of joined together cup-shaped housing assemblies forming a shortened cylinder adapted to enclose and secure an audio loudspeaker, the enclosure having openings in one face of the housing assemblies to allow passage of the primary sound waves from the contained loudspeaker. An acoustic shield attached to the speaker enclosure cylindrical side extends to the edge of the ear pocket and is sealed there.

Abstract: A frameless pierced metal speaker grille is directly attached to a panel in which a speaker opening is formed by a series of tabs integrally formed in the speaker grille at spaced locations about the perimeter of the grille. Each tab includes a rear facing planar section extending inwardly from a turned edge perimeter of the cover grille and abutted against the panel structure, a v shaped engagement section extending rearwardly from the planar section and having legs adapted to squeeze fit the panel edge adjacent the speaker opening, and an entry section extending rearwardly from the v section and inclined inwardly to cam the tab inwardly at assembly of the grille. The tab shape enables secure spring fitting to the panel structure while being formed of the relatively mild material of the grille material which is pierced as by being perforated to form the open area cover grille.

Abstract: A waterproof ground audio speaker apparatus has a speaker housing having a cylindrical sidewall, one open end and a closed end. A hollow cylindrical inner housing has a pair of open ends and is attached to the speaker housing with its walls in a spaced relationship to the walls of the speaker housing to form a passageway between the walls of the inner housing and the walls of the speaker housing. A loud speaker is mounted in the hollow inner housing facing one open end thereof for directing acoustical energy out the open end of the speaker housing and directing the backwave of the speaker through the hollow inner housing and through the passageway between the inner housing and the speaker housing to the open end of the speaker housing. A rigid domed supporting cover extends over the opening of the speaker housing and a filter membrane cover covers the open end of the speaker housing to protect the inside of the speaker enclosure.

Abstract: A loudspeaker cabinet in which an elongated enclosure has a driver mounted internally in one wall thereof in facing, open communication with the exterior of the enclosure and an outlet sound port positioned in spaced relation to the driver in another wall of the enclosure remote from the one wall. An audio transmission passage extends longitudinally at right angles to the axis of the driver and is defined by baffles extending in equally spaced parallel relation to one another to divide the passage into a plurality of communicating folded passage sections extending from open communication with the driver to terminate in the outlet sound port. The total length of the passage through its cross-sectional area is on the order of from 8:1 to 16:1 so that at low frequencies air pulses delivered by the driver will remain in phase throughout the length of the transmission passage.

Abstract: In a preferred embodiment, a speaker system within a closed wooden cabinet in which the speaker is suspended in closed cell foam within a cabinet speaker circular-port, devoid of rigid attachment of the foam and of the speaker to the cabinet, the closed-cell foam being mounted in an open-ended slot between flanges mounted on the speaker cabinet, and the speaker magnet being supported by a resilient gasket mounted on the cabinet by a gasket-support structure, and a rear port being closed by an inner non-porous membrane and an outer porous fabric membrane having foam therebetween, mounted within a membrane-support frame that is suspended within open cell foam suspended within the rear port devoid of rigid attachment to the cabinet, supported between inner and outer flanges mounted on the cabinet, the cabinet being devoid of open ports.

Abstract: A cover system covers the radiating faces of a loud speaker enclosure. It includes a sheet of flaccid material, such as a sheet of textile fabric printed with an ornamental design and provided with a border of "VELCRO" felt. The speaker radiating face carries either a complete peripheral border or segments of the hook component of a "VELCRO" fastener that is engagable with the felt. In use, the borders of the sheet are rolled up and stuck onto the hook strips to hold the sheet in place. The system makes the customizing of domestic and other loud speaker enclosure very simple.

Abstract: To fasten metallic or plastic covers or panels to supporting surfaces, snapping-in lugs are formed on these covers. These lugs are inserted into the slots of the supporting surface.

Abstract: The present invention discloses a ported reflex speaker enclosure for use in the automotive audio systems industry. The ported reflex speaker enclosure is a design that factors the audio and thermal design considerations as found in the automotive operating environment as well as factoring the audio and mechanical mounting considerations as found in the automobile audio systems. The ported reflex speaker enclosure is primarily intended for six (6) by nine (9) inch standard speaker chassis used in automotive audio systems that typically are found as non-enclosed suspended speakers in the trunk compartment of automobiles.

Abstract: A decorative speaker cover and a method for fabricating a speaker cover for use in a ceiling or wall comprising panels, the speaker cover having an appearance which blends with other panels so that it conceals the presence of a speaker system while providing satisfactory transmission of sound from the speaker system. The decorative speaker cover is fabricated by first forming a mold liner suitable for generating a facsimile of a ceiling or wall panel. Next, the mold liner is placed in a molding container and a closed cell expandable foam system is uniformly spread over the mold liner so that the foam rises vertically. The thickness of the resulting cast is reduced to a dimension below which acoustic transmission loss is not discernable by human ears.

Abstract: A loudspeaker system is provided for installation in a space between a front panel and an enclosed area behind the front panel of a partition such as a wall, ceiling or floor fronting a listening area. Electroacoustical transducers are provided which have a two sided vibratory diaphragm driven by an electrical signal. An enclosure mounts the electroacoustical transducers such that one side of the vibratory diaphragm is in contact with air outside the enclosure, with the enclosure being configured to substantially enclose and define a specific volume of air within the enclosure having a predefined acoustic compliance and which is in contact with the other side of the vibratory diaphragm of the electroacoustical transducers.

Abstract: A speaker system mounted on a rear portion of a vehicle compartment. The speaker system has an elongated cabinet extending in horizontal direction, and an elongated buffle plate coupled to a front open end of the cabinet for providing a cabinet chamber. Within the chamber, a woofer speaker is provided. A vibration surface of the woofer speaker extends in a direction perpendicular to a longitudinal direction of the cabinet, and a speaker frame of the woofer speaker is interposedly supported between the cabinet and the buffle plate.

Abstract: A sound reproducing apparatus for use in a vehicle having a speaker system constituted by at least one acoustic duct and a speaker unit disposed at a throat of the acoustic duct, an opening formed at the other end of the acoustic duct facing the passenger compartment of a vehicle. The apparatus is arranged such that, F0 and Fs are substantially equal to each other. Where Fs is the lowest frequency in a frequency range within which the imaginary part of the acoustic impedance at the sound radiating surface of the speaker system in the direction of the space within the passsenger compartment is zero and F0 is the low-range resonance frequency of the speaker system itself in the free space.

Abstract: A low-profile modular sound system comprises a completely self contained high fidelity speaker system which may be easily installed in the supporting gridwork for a suspended ceiling in place of a conventional acoustic ceiling tile. Each of a pair of speakers, including a woofer and tweeter, is installed in a rectangular mounting panel of a size and shape corresponding to a ceiling tile. A shallow rear housing is attached to the mounting panel to enclose the rear portions of the speakers and any other system components, such as a balance control. A single electrical connector attached to the outside of the housing provides an interconnectiion between the speaker leads and the external source of power for the speakers.

Abstract: A loudspeaker with a pair of speaker units and a manifold chamber between the speaker units for combining the sound from both speaker units. The manifold chamber is formed by walls having an exit opening and a pair of rectangular apertures, the apertures confronting each other on opposite sides of the chamber and the exit opening being disposed normal to a plane centrally between the apertures, and the apertures and exit opening having parallel axes of elongation. One of the speaker units is coupled to each of the apertures to direct sound into the manifold chamber, and the manifold chamber is provided with a wedge confronting the apertures to direct sound parallel to the central plane between the apertures toward the exit opening. In one construction, a horn is coupled to the exit opening to conduct sound from the manifold chamber.

Abstract: A speaker grille is provided which protects the speaker diaphragm from tampering or vandalism. Speakers which are used in public places for intercoms, message transmission, voice synthesis instructions, or the like will be covered by the speaker grille which has two sets of misaligned sound transmitting apertures, which will allow sound to emanate from the speaker, but will prevent objects from being pushed through the grille apertures to the diaphragm. Each set of apertures is found in a separate grille component, and the components are then assembled to form the improved grill. The construction of the grilled assembly is such that it will resist most attempts to break it with commonly carried items.

Abstract: A speaker is installed on a door panel of an automobile by utilizing a supporting unit including a base and a substantially disc-shaped spacer. The base is attached to the door panel and has a bottom surface inclined with respect to the door panel. The speaker is secured to the inclined bottom surface of the base by an attachment screw, between which the spacer is interposed. The spacer has an inclined surface adapted to be in contact with the inclined bottom surface of the base. The spacer is provided with a half-round groove through which a screw extends to secure the spacer to the base at a desired position relative to the latter within an range of 180.degree. rotation. The inclination of the base is amplified or counterbalanced by the inclination of the spacer in dependence with relative position therebetween to vary the orientation of the speaker supported on the opposite surface of the spacer.

Abstract: A loudspeaker system is provided for installation in a space between a front panel and an enclosed area behind the front panel of a partition such as a wall, ceiling or floor fronting a listening area. Electroacoustical transducers are provided which have a two sided vibratory diaphragm driven by an electrical signal. An enclosure mounts the electroacoustical transducers such that one side of the vibratory diaphragm is in contact with air outside the enclosing between the front and rear panels of the partition, with the enclosure being configured to substantially enclose and define a specific volume of air within the enclosure having a predefined acoustic compliance and which is in contact with the other side of the vibratory diaphragm of the electroacoustical transducers.

Abstract: An omnidirectional speaker unit includes a housing having a plurality of twelve identical sides each having a speaker mounted therein and equally spaced around and directed outward from a common point with all speakers connected to operate in unison to provide a spherical dispersal of sound. A preferred embodiment of the invention is the intersection of six equi-distant identical hyperboloids of two sheets creating horns that merge at unique saddle-like curves between adjacent horns of the enclosure with each speaker placed at the end of a long hyperboloid horn.

Abstract: The present invention constitutes a sound output unit for installation in a ceiling structure including an assembly for mounting a loudspeaker for use in conjunction with said output unit. The sound output unit comprises a polyhedral chamber or enclosure, a loudspeaker, an amplifier, and two sets of baffles. The polyhedral chamber is specially shaped in order to help reduce resonant vibrations. The loudspeaker is mounted in a large opening in the bottom plate of the enclosure so that it can radiate sound out from the enclosure into the area below the ceiling structure in which the unit has been installed. The amplifier is secured on the top of the loudspeaker inside the chamber and provides local power amplification. The baffles are mounted on the interior surfaces of the top and bottom plates of the enclosure and help reduce spurious sound reflections within the enclosure.

Abstract: A speaker grille assembly (800) includes a speaker grille 410), a felt (200), and a speaker (300). The speaker grille has a front surface (420), and a rear surface (430). The speaker grille (410) has plurality of equally spaced channels (440) for passage of sound. The sound channels (440) are formed such that that the rear surface port (422) is substantially larger than front surface port (411) thereby enhancing acoustic power transfer by increasing the effective sound passage space.The sound channels (440) can be formed such that the passage through the grille (410) are provided with either gradual or sudden transition from front port (411) to the rear port (422) resulting in a larger rear surface apertures.

Abstract: A loudspeaker having means for acoustically impeding excursion of the transducer diaphragm and means for acoustically attenuating the output of acoustic vibrations of frequencies above a preselected frequency. The loudspeaker includes first and second subchambers separated by a dividing wall in which the transducer is mounted. A first port acoustically couples the first subchamber with the second subchamber and a second port acoustically couples the second subchamber with the outside environment surrounding the loudspeaker.

Abstract: An audio speaker mounting plate is disclosed that can be easily adapted for cars, boats, planes, or the like. This mounting system is inexpensive to manufacture, lightweight, and easy to install and repair. The mounting bracket is, preferably circular and has an inwardly extending collar which engages the speaker inserted therein. An audio system mounting assembly, includes a mounting bracket having a main body section with a hollow center portion, a mounting flange to be secured to the outer surface of a wall panel, and a mounting collar. An audio speaker is secured directly to the mounting collar of the bracket. A speaker cover fits within the hollow center portion of the mounting bracket. The system may also include a backing plate to insure a secure engagement of the panel mounting fasteners, which extend through the outer flange of the mounting bracket.

Abstract: One or more up-firing woofer loudspeakers (12 or 22) are mounted atop a truncated pyramidal enclosure (1 or 21). A down-firing tweeter (5 or 25) is aligned above the woofer. A sound-reflecting sphere (4 or 24) is disposed between the woofer and the tweeter. When the sphere is aligned there-between omni-directional sound is radiated in both horizontal and vertical planes. When the sphere is positioned to the rear, a medium to high frequency forward hemispherical pattern is obtained. This pattern is desirable when the loudspeaker structure is positioned against a wall. Duct ports (3) or a folded horn (20) within the enclosure enhance very low frequency sound.

Abstract: A sound-permeable loudspeaker cover including a frame in which are arranged mutually crossing webs of a synthetic plastic material delimiting sound passage openings. A sound-permeable material, for instance a fleece, a textile fabric or a knitting, covers the sound passage openings, and is arranged approximately in the middle of the webs. The webs are produced as a single part according to the injection molding process, and penetrate the sound-permeable material to anchor it at a plurality of individual locations.

Abstract: A speaker system includes a thin plate type vibrating element mounted in, and brought into contact with, a balloon formed of a synthetic rubber or resin film. The balloon comprises a balloon member formed of a flexible film such as a vinyl chloride resin or synthetic rubber film and having therein a pocket, in which an inner film forming the pocket has an area somewhat larger than that surrounded with a laminating line on an outer film forming the pocket, whereby the inner film is brought in pressure contact or engagement with the outer film, when the balloon assembly is inflated.

Abstract: A tone generator of the type in which a housing defines a pair of communicating chambers one of which is closed except for an area of communication with the other chamber. A thin flat diaphragm of circular configuration is mounted in an operative position over the area of communication between the chambers in engagement with a flat annular surface defining the same. An annular diaphragm retaining member is mounted in an operative position in superposed relation to the diaphragm in fixedly secured relation within the housing. An improved mounting for the diaphragm is provided which includes a plurality of annularly spaced transversely extending diaphragm engaging lugs formed on the retaining member. The lugs extend in engagement with the diaphragm so that when the retaining member is in its operative position the engagement of the lugs with the diaphragm serves to retain the diaphragm in its operative position.

Abstract: A device for fitting a loudspeaker (17) into a cut-out of a sound panel, in particular into cut-outs of the most varied types of sound panel of motor vehicles. The loudspeaker can be fitted by its frame border (15) in each case into a mount adapted to the cut-out and which mount has a sound passage (3) in the shape and size of the frame border (15). The frame border is secured to the mount in the region of the border of the sound passage (3). The mount is in the form of an intermediate plate (1) which has mechanisms (7, 27) for the quick fastening of a loudspeaker frame border of the same shape and size.

Abstract: A reverberating platform structure usable as an exercise floor or, depending upon the configuration thereof, for the support of people or objects thereon wherein the platform is supported by an anchor structure above a foundation such that there is an open space between the foundation and the undersurface of the platform. The anchor structure may be essentially flexible so as to provide a giving or flexible structure to the platform for a person to exercise, dance, or otherwise move thereon. An agitator assembly primarily in the form of a plurality of speakers are disposed within the space immediately adjacent to the space slightly from the undersurface of the supporting platform wherein activation of the speakers causes vibration to be communicated directly to the platform but wherein the platform is further structured not to generate specific sounds therefrom so as to be considered part of the speaker system itself.

Abstract: A loudspeaker system for low frequencies has a manifold chamber into which oppositely mounted and aligned woofer units radiate sound. The chamber radiates the sound perpendicularly to the woofer axes, either directly into space or into a horn. An additional back woofer may radiate directly in the perpendicular direction.

Abstract: A mounting frame for a loudspeaker has a plurality of similar slots formed at each of the corners thereof. A beveled tooth is formed in one of the walls of each slot. An L-shaped bracket having longitudinal and transverse arm portions has transverse serrations formed in the outer surface of the longitudinal arm portion. One of the brackets is inserted into each slot opposite the beveled tooth thereof with the serrations ratcheting on the edge of the tooth to a selected locking position whereat the transverse arm of the bracket abuts against the speaker frame. A bendable tab extends into the slot at a portion thereof adjacent to the beveled tooth, this bendable tab operating to retain the bracket in position but when bent over enabling the sideways motion of the bracket so that it can be removed from the slot.

Abstract: High quality single or multiple channel sound dispersal is obtained through the arrangement of a plurality of similar speakers divergently mounted in an airtight frame with integral horns formed therein such that the central axis of each speaker is coaxial with a line normal to and projected from the center of each face of a polyhedron characterized by the tetrahedron, the hexahedron, the octahedron, the dodecahedron and the icosahedron. When the speakers thus arranged are excited in phase, a series of infinite acoustic baffles are created between adjacent speakers creating a series of exponential horns which disperse the sound energy as if from a point source to the walls, ceiling and floor of the listening room and then by reflection to the listener. The frame/horn component is manufactured of universal parts.