Abstract: A speaker holder includes a hollow, open holder body which receives a speaker within an inward top flange thereof, a bottom plate fastened to the holder body at the bottom to hold a spring-supported ball in a center hole on an upright center rod thereof for permitting the speaker to be balanced on the ball, and a mounting plate detachably fastened to the bottom plate through hooked joints for mounting the speaker holder on a supporting surface.

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: The invention relates to a sound distributor with symmetry of revolution. The distributor comprises two sound reflecting cups, having a convex shape which is an exponential of surface revolution about a fictitious axis. The outer surfaces of these cups are arranged in tail to tail manner. The distributor has at least one sound source positioned facing a small opening of one of the cups. Around an opening in the bottom of the second cup, the distributor also has a trumpet-shaped reflector and a cone-shaped reflector for directing sound along the axis.

Abstract: A speaker tube structure formed of a semi-cylindrical first side wall portion and a planar second side wall portion, with the second side wall portion including speaker members mounted therewithin, having a tuning port orthogonally directed into the second side wall portion extending into the speaker tube cavity in a spaced adjacency relative to the tube axis. The tuning port is arranged to receive a plurality of inserts to permit tuning of the speaker tube.

Abstract: A speaker cabinet in which a cross section of an outer peripheral portion (11) is formed as an elliptic shape and opening portions (22 to 25) formed on the outer peripheral portion (11) and into which speakers (2 to 5) are mounted are formed as horn shapes whose diameters are improved toward the outside. The speaker cabinet includes a plywood member (10) that is formed by laminating a hard plate member, a soft plate member and a light and soft rear surface plate member on a face front surface plate member. The cabinet is molded in a predetermined curved fashion to have an elliptic shape. Thus, an acoustic characteristic of the speaker cabinet can be increased and a manufacturing cost of the speaker cabinet can be reduced.

Abstract: A loudspeaker system having the ability to uniformly direct high-frequency as well as low-frequency sound hemispherically is described. The acoustical centers of a low-frequency and a high-frequency driver are aligned in space to provide a common source of sound to be directed through a common sound-guiding structure. The high-frequency sound is guided by the formation of an acoustical horn between the spherical mounting structure of the low-frequency driver and the reflector generally employed in reflecting and diffracting low-frequency sounds. One side of the acoustical horn has an acoustic path length smaller than the other, forcing sound to further diffract upon passage from the horn.

Abstract: A reflex folded horn loudspeaker enclosure system provides a compact speaker that can produce high quality sounds in all ranges. The system has at least one resonance air chamber that is in communication with the sound chambers of the speaker housing, which allows for a compact space to provide the high quality sound.

Abstract: The invention relates to a loudspeaker arrangement for creating a three-dimensional stereo sound effect. The loudspeaker arrangement is to be located at a suitable distance from sound-reflecting surfaces. The loudspeaker elements (12a, 13a, 14a; 12b13b, 14b) of the left-hand channel (2) and the right-hand channel (3) in the loudspeaker arrangement are located within one and the same loudspeaker unit (1), where they are separated from each other by means of a zone (4) which is at least of the same size as the interval (a) between human ears. The loudspeaker elements are arranged to radiate towards different sides (A, B) of the said zone (4), in a similar fashion, within 180.degree. circle sectors, in which case the sounds reflected from the surfaces, together with the sounds coming directly from the loudspeaker unit, create a depthwise expanded, three-dimensional stereo sound effect, mainly within the sector (10) expanding away from the loudspeaker unit.

Abstract: An audio-visual furniture stand is disclosed which includes three horizontal shelves. An upper shelf for supporting a television, VCR, or other audio-visual equipment is provided. The furniture stand also includes a second and third shelf disposed below the upper shelf and designed to receive in the openings defined by the shelves and the legs of the stand, two speaker enclosures. The speaker enclosures are eight-sided and each includes two hexagonal walls designed to enable various orientations or positions of the speakers as they rest upon supporting surfaces. The speaker enclosures also include a protective grill cover which may include color coordinated cloth or foam material which matches the interior decor of a particular room or home.

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 tube speaker system having a pair of cylinder bass speakers aligned end to end with closed or blind ends in mutual juxtaposition and with speakers mounted in the other open ends which are opposite each other. A support is secured beneath the coaxially aligned speaker cylinders to prevent the cylinders from rolling on their cylindrical walls. Also, the system is provided with means for forming a laterally enclosed sound tunnel that extends the lengths of the speakers in communication with radial openings in the cylindrical walls thereof. The support may take the form of channel-shaped stand atop the sides of which the tubular speakers are mounted. Alternatively, the sound tunnel may be formed by a larger diameter cylinder within which the cylindrical tube speakers are located. In this embodiment the stand may be formed by a flat slab atop which both the larger diameter cylinder and the cylindrical tube speakers are mounted.

Abstract: A sound output system has a pair of right and left speakers and a pair of audio mirrors for respectively controlling directivities of sounds which are output from the pair of speakers. The shapes or arrangement of the pair of audio mirrors are adjusted such that a difference between arrival times of the sounds which are respectively output from the pair of speakers can be compensated by a sound pressure difference due to the Haas effect in a predetermined area. Alternative means are phase difference, dipole, and asymmetrical horn loading.

Abstract: An acoustic apparatus (10) adapted for use as either a sound projector or a ound receiver. The apparatus (10) comprises a bundle (20) of individual sound tubes (21, 22) disposed in a tube array unit (14) which rests on a support unit (13) operatively engaged with an acoustic unit (11). Only the ends of the individual sound tubes (21, 22) are provided with a plurality of spaced discrete sound ports (25).

Abstract: Disclosed is a swivel speaker system to custom-aim sound emanating from the speaker towards a listener. A speaker device of the present system comprises a sound driver disposed within a mount positioned within a housing. The mount swivels within the housing to direct the radiating frequencies to a desired location within a unique environment without obstructively projecting from a mounting surface. Preferably, the speaker has a minimum size to enable mounting at unconventional locations. Additionally, the speaker system, in accordance with another embodiment, provides a modular system having interchangeable support components which customizes the speaker to adapted to unique mounting surfaces in unique listening environments.

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 sound dispersing system using two or more vertically facing drivers in substantially coaxial alignment on a vertical axis. The drivers face conic reflectors which reflect sound radially over 360 degrees with substantial dispersion in vertical planes that include the vertical axis. Mounting means for drivers and reflectors are spaced vertically apart so that the vertical separation of the effective acoustic centers does not exceed industry standards for coherent sound above and below the horizontal plane equidistant between two drivers assigned adjacent bands of sound frequencies.

Abstract: An extensible sound case, comprises a speaker and an extensible sound chest assembly. The sound chest assembly can be extended to increase the space for resonance or drawn together to minimize space occupation.

Abstract: A public address system which consists of a longitudinal tubular member extending through an area serviced by the system, with a longitudinal opening and having a plurality of speakers spaced at regular intervals. The audio signals generated from the speakers are emitted through the opening in any direction desired. The speakers are hidden from view within the tubular member and by a cover on the opening which further protects the speakers from ambient contamination. Preferably, the tubular member consists of modular sections, each section including at least one speaker. The speakers may be controlled through a speaker control circuit.

Abstract: In an acoustic apparatus in which a vibrator is arranged in a Helmholtz's resonator having an open duct port, and the vibrator is driven to radiate a resonant acoustic wave, a duct resonance absorbing means is provided to the open duct port constituting the Helmholtz's resonator so as to remove an unnecessary resonant sound other than a Helmholz's resonant sound caused when the Helmholtz's resonator is driven, thereby removing noise in a radiated acoustic wave and improving distortion characteristics.

Abstract: An acoustic apparatus for improved bass sound reproduction comprising a resonator, a vibrator, and a vibrator drive means, the resnoator having a passive diaphragm serving as a resonance radiation unit for radiating an acoustic wave by resonance, the vibrator having an active diaphragm provided for the resonator, and the vibrator drive means having a drive control means for controlling a drive condition so as to cancel atmospheric counteraction of said resonator at the time of driving of the resonator, whereby the vibrator may be invalidated as viewed from the resonator, and the vibrator and the resonator can be independently designed.

Abstract: An acoustic apparatus for improved bass sound reproduction comprises a resonator, a vibrator, and a vibrator drive means. The resonator has a resonance radiation unit for radiating an acoustic wave by resonance, the vibrator has a diaphragm disposed in the resonator, the vibrator drive means has a motional feedback (MFB) means for detecting the movement of the diaphragm and negatively feeding back a motional signal corresponding to the movement of the diaphragm to the input side of the circuit, and the counteraction of the resonator on the diagram is canceled upon driving of the resonator whereby the vibrator may be invalidated as viewed from the resonator, and the vibrator and the resonator can be independently designed.

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: 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 vented speaker enclosure for use in the ear pockets of motorcycle helmets is disclosed which carries off parasitic sound waves emitted from the rear side of an enclosed audio loudspeaker in order that the parasitic sound waves not be allowed to enter the motorcycle rider's ear and distort the primary sound waves issued from the audio loudspeaker. The vented speaker enclosure consists of a pair of joined together cup-shaped housing assemblies adapted to enclose and secure the audio loudspeaker, having openings in one face of the housing assemblies to allow passage of the sounds waves from the contained louspeaker, and a venting tube connected to an opening through the peripheral wall of the speaker enclosure, the vent tube carrying off and away the parasitic sounds emanating from the rear of the loudspeaker. The venting tube is situated in creases of the helmet inner cushion leading to the outside.

Abstract: A sound diffuser assembly for use with a compressive driver. The sound diffuser assembly has a sound reflector for receiving and redirecting sound energy from the compressive driver. A sound diffuser having a plurality of curved shaped concentric rings is also provided and positioned to receive reflected sound energy and to direct the sound energy in a predetermined pattern. Mounting apparatus is further provided to mount the compressive driver to the assembly so that sound energy from the compressive driver is directed into the sound reflector.

Abstract: An enclosure for a loudspeaker is molded from a rigid acoustically inert material such as a polymer concrete. Preferably, the enclosure has an inner shell of a semi-rigid acoustically absorbent material providing damping for the enclosure. The enclosure may be conveniently manufactured by using a two-piece mold wherein the inner mold piece is sacrificed and forms the inner shell of the enclosure.

Abstract: The enclosure comprises inner and outer wall members with a vacuum space therebetween. The space is sealed by an O-ring and a flange of a loudspeaker at the mouth of the enclosure. The enclosure has the form of a vacuum-flask. It reduces unwanted propagation of sound by the enclosure.

Abstract: An apparatus to acoustically fluidize a bed of fine particles comprises a generally box-shaped hollow chamber. An acoustic source is located at the bottom of the chamber and a convection inhibiting heater is located at the top of the chamber. An acoustic wave is directed from the source into the chamber to levitate and suspend fine particles within the chamber at determinable distances from the acoustic source according to the intensity and frequency of the acoustic wave.

Abstract: A mobile speaker system for mounting on a rear parcel tray attachment portion of a vehicle, the speaker system includes: a bottom casing elongated along a vehicle's width; an upper casing mounted over the elongated bottom casing so as to form a speaker cabinet, the bottom casing having a plurality of first ribs projecting in a first direction, and a plurality of second ribs projecting in a second direction which is substantially perpendicular to the first direction; and fixing metal fittings attached to at least one of the ribs so as to prevent transformation of the bottom casing. In one embodiment, the upper casing includes a recess portion at a central portion thereof, an opening portion formed in the recess portion for mounting a woofer unit, and two ducts for a bass-reflex type cabinet are formed at opposite sides of the opening portion.

Abstract: An enclosure for a bass loudspeaker for housing in a larger multiple loudspeaker enclosure having a pair of concentric cylindrical shells filled with dense particulate matter.

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 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: An electro-acoustic transducer is formed of a loudspeaker enclosure having a form of revolution about an axis each end of which is closed by a loudspeaker. The two loudspeakers are mounted back to back in the axis of the enclosure, one of the loudspeakers being fed from an electric power source and being in this sense "active", whereas the other loudspeaker is "passive" in that it receives no electric supply, its movements resulting from the rear wave of the active loudspeaker. The enclosure is maintained vertically along its axis of revolution, and, on the other hand, the side wall of the enclosure is formed of a flexible material, unlikely to resonate with the front and rear waves of the loudspeakers.

Abstract: An improved audio transducer includes a diaphragm having a pair of cylindrically-shaped webs that provide greater bandwidth, reduced distortion and greater horizontal dispersion of sound. The audio output of the transducer is further improved by forming the diaphragm of a polyvinyl fluoride film. Other improvements include the use of damping pads to damp internal sound waves and damping strips on the diaphragm to minimize distortion at the resonant frequency of the transducer.

Abstract: A speaker system which has a speaker unit with a diaphragm and an acoustic path provided on the front side of the diaphragm so as to guide sound waves emitted from the diaphragm. The acoustic path is defined by a sound absorbing member. The space in the acoustic path and the sound absorbing member is separated by a partition member which is disposed in such a manner that at least a portion of the sound absorbing member is exposed to the space in the acoustic path, except that the portion of the sound absorbing member just adjacent the diaphragm is not exposed to the acoustic path. This arrangement eliminates peaks and troughs of resonance determined by the length of the acoustic path, so that flat sound pressure frequency characteristics can be obtained over a wide range up to high-pitch tone region.

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: A rear speaker unit for a motor vehicle is disposed in an elongate space such as a space which is defined between one of opposite sides of a rear seat and a vehicle body side panel. The speaker unit is made up of a tubular and substantially cylindrical speaker box and a speaker which is supported by the front end of the speaker box. The speaker box is elongate in the longitudinal direction of the vehicle body and has a front end portion which is so bent as to face the center of a passenger compartment of the vehicle. Hence, the speaker mounted on the front end of the speaker box also faces the center of the passenger compartment.

Abstract: A speaker system provided with a globular glass enclosure to which a speaker unit is attached, wherein the enclosure is mounted elastically on a support member which consists of an elastic material and has an opening to accommodate a bottom part of the enclosure therein. The direction of the speaker unit can be freely changed under a stable posture and the occurrence of box noise due to the insufficient contact between the enclosure and the support member is prevented. In the speaker system, the enclosure may be fixed firmly at the position of its notch opening to a baffle board made of a highly rigid and/or highly oscillation-damping material for fixing the speaker unit to the baffle board, and thus the occurrence of box noise coming from the transmission of the vibration of the speaker unit to the enclosure and also coming from the deformation of the opening of the enclosure to receive the speaker unit can be prevented.

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: The invention comprises a microphone and loud speaker system in which the components include a cylinder having a center section and an end section at each end of the center section in axial alignment with one another. The adjacent ends of the center and end sections are elliptical and lie in planes oriented at an angle of 35.degree.16' to the longitudinal axis of the module, the long axes of the ellipses are oriented at 45.degree. to horizontal. The planes of the elliptical ends are substantially isomorphic to the tympanic membrane of the human hearing structure and represent half the dihedral angle of a regular tetrahedron. All of the loudspeaker transducers are shielded by sheilding cylinders with elliptical end faces lying in planes oriented, at half the dihedral angle of a regular tetrahedron, namely, 35.degree.16' to the axes of the cylinders, with the long axes of the ellipses oriented at 45.degree. to the horizontal.

Abstract: A sound radiating loudspeaker and tubular enclosure combination wherein the tubular enclosure is either formed in a helical configuration or two or more straight tubular sections which interest each other at an angle. In either form the tube is capable of free standing on a supporting surface with a loudspeaker closing the upper end of the tube and angled generally toward a listening area. Also in either form, additional speakers enclosed in shorter tubes may be joined to the main tube with all speakers either in a common plane or in planes at a slight angle to one another.

Abstract: A portable modular loudspeaker apparatus consists of a cabinet containing at least two speakers pointing in different directions so that sound generation patterns of the different speakers tend to diverge. The cabinet is narrower at the back than at the front, and placing two of the cabinets in a side-by-side abutting relationship provides an array of speakers positioned in a generally arcuate pattern. Each cabinet is provided with manual gripping means on a exterior surface to facilitate transport and installation.

Abstract: A speaker enclosure characterized by a curved back wall and top and bottom planar surface members which together define a front opening. A speaker member, a horn member and a tweeter member are adapted to be mounted within the front opening. At least the curved back wall is made from wood of a specified range of thicknesses and of a particular range of radii of curvature to achieve increased power output for the speaker and enhanced quality of sound.

Abstract: A loudspeaker enclosure which is adapted to be easily assembled with other like enclosures. The loudspeaker enclosure comprises a front wall through which sound can emanate, two essentially parallel end walls, each end wall being in the shape of a trapezoid and a back wall. The enclosure further includes two side walls extending between the end walls, each of the side walls having a plurality of outwardly projecting linear ribs extending on a line between the front wall and the back wall.

Abstract: Audio speaker apparatus includes a chamber portion, a sound generating portion, a sound distributing portion and a positioning portion. The chamber portion includes a generally transverse face section with a housing section extending from adjacent the periperhy of the face section along a centerline of the chamber portion. The housing section includes wall elements converging from the face section. The face section and the housing section form a speaker chamber. The sound generating portion includes a low frequency range speaker mounted adjacent the face section and facing outwardly therefrom. Middle frequency range and high frequency range speakers are mounted adjacent the housing section intermediate the length thereof with the mid-range and high range speakers facing in a direction different from the low range speaker. The sound distributing portion includes a deflecting member disposed directly outside the low range speaker and closely adjacent thereto.

Abstract: A loudspeaker is disclosed having an enhanced response at bass frequencies. The loudspeaker includes a tubular enclosure having a pair of outwardly directed, opposing loudspeaker drivers mounted over each end. A port is provided through the enclosure midway between the drivers and is coupled to the exterior of the loudspeaker by a perpendicularly projecting duct. The length and cross-sectional area of the duct, as well as the enclosure, are selected to describe an acoustic cavity having a predetermined mechanical resonance. The opposing nature of the drivers, spaced apart by the continuous curved walls of the enclosure, reduces spurious resonances within the enclosure. In addition, the resultant T-shaped configuration of the loudspeaker maintains the loudspeaker substantially stationary in a moving vehicle without the need for auxiliary fastening devices.

Abstract: A loudspeaker enclosure is configured in trapezoidal shape, with one angular end wall supporting an electromagnetic or electrostatic loudspeaker of the type having both front and back acoustic waves, with the front of the loudspeaker registering with a front wave opening in the angular end wall and the back of the loudspeaker communicating through a transmission line cavity with an acoustic port in the opposite angular end wall. Said opposite angular end wall supports a tweeter spanning said acoustical port. The port is dimensioned larger than the tweeter to provide a port opening having a cross sectional area of about 0.5 to about 2.0 times the operative area of the loudspeaker, and the centerlines of propagation of sound waves from the front waves of the loudspeaker and port form an included angle of about 90.degree.. A mounting base is configured to support the enclosure removably at the port end with the parallel sides extending vertically.

Abstract: A device for the generation of vortex rings which consists of a box supplied with orifices and electromechanic transformers. The electromechanic transformers are controlled by signalers and cause pressure waves within the box which form vortex rings at the orifices. As signalers low-frequency amplifiers can be used which send out music or speech signals or electronic circuits which form a kind of optimized signal.

Abstract: A singular configuration for a high fidelity sound speaker enclosure is disclosed. This acoustical structure is formed in two joined sections: the upper section which generally forms a four sided truncated pyramid and the lower section which generally forms an inverted four sided truncated pyramid. The complete structure, when viewed toward its frontal aspect, exhibits a generally hexagonal shape. The enclosure may house one or more speaker drivers and one of several methods of interior acoustic control may be utilized. The non-parallel walls and slanted front panel contribute to improved audio dynamics for electronic sound reproduction systems, and the overall design enhances contemporary decor aspects.

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.