Abstract: Provided are a speaker and an electronic device. The speaker includes: a speaker case; a speaker body arranged in the speaker case and configured to vibrate and produce sound, the speaker body dividing the speaker case into a front sound cavity and a rear sound cavity, the speaker case being provided with a speaker hole, and the front sound cavity communicating with outside of the speaker case through the speaker hole; and a resonator arranged at the speaker case, a side of the resonator being arranged corresponding to the front sound cavity, and another side of the resonator being exposed to outside of the speaker case. By coupling the resonator in the front sound cavity of the speaker, the high frequency reproduction of the speaker is improved and the intermodulation distortion of the speaker is reduced, thereby improving the sound quality of the speaker in the electronic device.

Abstract: Example embodiments provide a device that includes a housing backplate affixed to a housing which embodies one or more of a speaker and a microphone, a threaded channel affixed to the housing and extending perpendicular from the housing backplate, and a wall mount fitting with one or more securing tabs to hold the wall mount fitting to a wall mount plate.

Abstract: An internal component and external interface arrangement for a cylindrical compact computing system is described that includes at least a structural heat sink having triangular shape disposed within a cylindrical volume defined by a cylindrical housing. A computing engine having a generally triangular shape is described having internal components that include a graphics processing unit (GPU) board, a central processing unit (CPU) board, an input/output (I/O) interface board, an interconnect board, and a power supply unit (PSU).

Abstract: A speaker system is provided with a cabinet with a front face. At least one forward-firing driver is supported by the cabinet to project sound along a first axis that is generally perpendicular to the front face of the cabinet. At least one upward-firing driver is supported by the cabinet and arranged above the at least one forward-firing driver to project high frequency sound along a second axis that is angularly offset from the first axis at an acute splay angle. A controller is programmed to provide a mid-range frequency component of a front audio channel to the at least one forward-firing driver, and to provide a high frequency component of a top audio channel to the upward-firing driver.

Abstract: The electrodynamic loudspeaker (10), comprising: a fixed frame (12), a motor including a fixed base (14) connected to the fixed frame (12) and a part (16) movable axially relative to the fixed base (14) along an axis (A-A?), a convex membrane (18), the convexity of which is oriented toward the outside of the loudspeaker (10), and a truss (20) connecting the convex membrane (18) and the moving part (16). The truss (20) comprises an inner ring (46) and an outer ring (48) that are coaxial, connected to one another by radial pillars (50) and a crown (52) for fastening to one end (53) of the moving part (16), the convex membrane (18) being fastened bearing on the inner and outer rings (46, 48).

Abstract: In one embodiment, a portable computing device is described. The portable computing device includes a first surface comprising at least one user interface. The portable computing device also includes a second surface opposite the first surface. Further, the portable computing device includes at least one speaker port in the first surface. Further yet, the portable computing device includes a collapsible speaker chamber configured on the second surface opposite the at least one speaker port. Moreover, the portable computing device includes a speaker configured in the portable computing device between the speaker port and the collapsible speaker chamber.

Abstract: A transducer assembly comprises a housing and a plurality of frequency steered transducer array elements. Each of the transducer array elements includes a plurality of piezoelectric elements. The frequency steered transducer array elements are configured to receive a transmit electronic signal including a plurality of frequency components and to transmit an array of sonar beams into a body of water. Each sonar beam is transmitted in an angular direction that varies according to one of the frequency components of the transmit electronic signal. The frequency steered transducer array elements are positioned within the housing in a fan-shaped configuration where an end section of at least two of the frequency steered transducer array elements are within an intersection range of each other.

Abstract: A loudspeaker module, comprising a housing and a loudspeaker unit accommodated inside the housing, wherein the loudspeaker unit comprises a vibration diaphragm, a side wall of the housing is provided with a side sound hole of the loudspeaker module, a space formed by the vibration diaphragm, the housing and the side sound hole is a sound channel of a front acoustic cavity, the sound channel comprises a root portion close to the vibration diaphragm, an opening portion close to the side sound hole and side walls connecting the root portion and the opening portion and arranged oppositely, the side walls comprise a straight side wall and a bent side wall, and the width of the root portion of the sound channel is greater than the width of the opening portion.

Abstract: A microphone assembly (10) using in a portable electronic device includes a fixing component (12) detachably fixed to a housing (30) of the portable electronic device, and a main microphone body (14) latched to the fixing component (12). The microphone assembly (10) may be conveniently detached and increases reliability of the housing (30).

Abstract: A ported or bass-reflex loudspeaker includes one or more ports incorporated into the loudspeaker cabinet without corresponding increase in cabinet dimensions. In one embodiment, this may be accomplished by integrating the one or more ports into one or more corresponding side panels of the loudspeaker cabinet. In another embodiment, the port(s) may also (or instead) be incorporated into a rear panel of the subject loudspeaker. In another embodiment, the one or more ports may be integrated with and function as handles for gripping and/or transporting the loudspeaker.

Abstract: A loudspeaker mounting frame (1) for an electronic appliance has a central opening for receiving a loudspeaker membrane (24), and a plurality of through holes (11) surrounding said central opening for receiving fixing means (25). The through holes (11) are tapered so as to accommodate the fixing means (25) in varying orientations. Spherical bosses (6) surrounding said through holes (11) are formed at a rear side (5) of the mounting frame (1).

Abstract: A microphone assembly fitted to a panel of a vehicle-mounted control module, provided with a housing for housing a microphone and having an opening section on a surface facing the panel, and a holding case for holding the housing so as to be capable of pivoting, and when inserted into a receptacle provided in the panel the housing pivots so as to seal the opening section to the panel.

Abstract: An elliptical speaker system is provided for in-wall/in-ceiling mounting. The speaker system comprises an elliptical speaker frame or bracket defining a speaker front plane having a generally arcuate inner surface. First and second speaker components are mounted within the speaker frame, on opposing sides of the speaker inner surface. At least one of the speaker components may be translatable within the speaker frame.

Abstract: In a speaker including a voice coil which is wound on a voice coil bobbin and is inserted into a magnetic circuit gap of a magnetic circuit, and a cone which is coupled to the voice coil bobbin for vibration, the cone (16) is constructed of two divided cones: a drive cone (16A) linked to the voice coil bobbin (14) and a cone paper (16B) linked through an edge (17) to a frame (F).

Abstract: A venturi expander is mounted on a speaker enclosure to receive the rearward-propagated sound waves and to extend the propagation path. The venturi expander's reflective sides direct the rearward sound to the sides or top or bottom of the speaker enclosure to produce a reflected sound surrounding the speaker enclosure and producing sound to the sides of the speaker substantially as projected from the front of the speaker.

Abstract: A loudspeaker assembly with a transducer capable of being swiveled to direct the sound to a convenient point thereby allowing the listener to select the optimal direction of sound. The assembly comprises a unique design which prevents the transducer from dropping below the plane of the speaker's baffle, thereby eliminating diffraction of sound waves which arise when sound radiates off the sharp edge of the cavity wall upon rotation of the transducer. The assembly allows a listener to adjust a transducer, such as the high-range frequency tweeter component of an in-wall speaker to his liking, without the need to remove and/or re-install the speaker in the wall. The assembly is equally adaptable to the interior of a vehicle or for use as a free-standing floor speaker. The assembly provides a unique speaker with a pivoting transducer which provides quality, multi-directional sound, free from any distortion created by the diffraction of sound waves.

Abstract: An in-ceiling loudspeaker is provided which comprises a woofer and at least three tweeters located below the woofer with respect to the ceiling with the woofer and tweeters arranged to radiate direct acoustic signals downwardly and widely spread from the loudspeaker, the three tweeters mounted at acute angles with respect to the horizontal plane which is parallel to the ceiling, the acute angle preferably being approximately 65.degree.. The three tweeters are regularly spaced equally at 120.degree. from each other between the axis of the tweeter and the plane of the ceiling.

Abstract: An audio speaker cabinet or enclosure having a sounding board and air space for enhancing the quality of sound produced by the speaker cabinet. The speaker enclosure is characterized in a preferred embodiment by a rectangular cabinet having a sounding board mounted in the cabinet enclosure interior between the front and rear panels of the enclosure, closely spaced with respect to the rear panel. A resilient membrane such as a sheet of vinyl is mounted on the front surface of the sounding board over an opening in the sounding board behind the speaker. A bass slot is included in the front panel below the speaker for air circulation into and from the enclosure interior and facilitating the attentuated sound produced by the vinyl sheet on the sounding board.

Abstract: Apparatus for mounting a speaker to a ceiling of a room that comprises an attaching ring adapted to be attached to a joist. A mounting ring is connected to the attaching ring. Apparatus to position the speaker at an angle relative to a front surface of the mounting ring and rotatably supports the speaker on the mounting ring so that a sound directional axis of the speaker may be rotated toward a chosen position in the room.

Abstract: An audio speaker system has at least one expandable speaker enclosure which comprises a rigid upper wall, a speaker mounted to the upper wall and a rigid bottom wall. One edge of the bottom wall is pivotally attached to a corresponding edge of the upper wall. Flexible side walls interconnect the upper and bottom walls so as to form a substantially closed speaker enclosure, the side walls being configured for enabling the enclosure to be varied between a first, collapsed configuration for carrying and a second, expanded configuration having a predetermined optimum enclosed volume for sound quality when in use. A stereo pair of such enclosures have provisions for detachable attachment to the bottom of a keyboard portion of a notebook-type computer. Variations are described in which the stereo pair of expandable disclosures are integrated, in one case, into the keyboard portion, and in another case, into the display portion of a specialized notebook-type computer.

Abstract: A sound imaging system preferably including two enclosures each comprising a truncated conical base unit and a truncated conical upper unit supported above and spaced apart from of the base unit, and containing a bass driver and composite midrange and high frequency drivers. The bass driver is oriented horizontally at the top of the base unit, and the sound energy produced therefrom is reflected by a conically shaped acoustic lens or defector depending from within the interior of the upper unit directly above the bass driver, such that the sound energy is reflected downwardly along and between the spaced apart truncated conical walls of the upper unit and base unit and emanates radially therefrom in all directions. The composite midrange and high frequency drivers are supported at the top of the upper unit on a crown structure having a plurality of vertical legs defining a platform oriented approximately 20.degree. relative to horizontal.

Abstract: An audio or video apparatus has a housing, a loud-speaker and an acoustic channel. The loud-speaker acoustically cooperates with the channel. One end of the channel opens into an aperture in a side of the apparatus. The dimensions of the loud-speaker and acoustic channel and the positioning thereof within the housing are chosen so as to provide an apparatus that is compact and at the same time produces improved audio reproduction.

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: A multiple speaker loudspeaker system wherein an internal baffle extends the full length of the interior volume dividing the interior volume into two unequal portions. The baffle has folded portions, which is not parallel to the walls of the enclosure. Loudspeakers are mounted onto the folded portions within a first volume. The loudspeakers radiate sound into a second volume. One of the first and second volume is ported in a bandpass configuration, to the outside of the enclosure. Thus, the non-parallel portions of the baffle reduce unwanted peaks and/or cancellations in the sound emanating from the enclosure. Additionally, the baffle is secured along its width to top and bottom walls of the enclosure, thus also providing extra rigidity to the enclosure.

Abstract: A compound driver loudspeaker system combines a single exterior radiating loudspeaker with a plurality of internal auxiliary loudspeakers in a cabinet. The cabinet has an external baffleboard and an internal baffleboard, the external baffleboard having a single baffle cutout for receiving the radiating loudspeaker and a plurality of internal baffleboard cutouts for receiving each of the auxiliary loudspeakers. The baffleboards and loudspeakers define a desirable air chamber between them. The auxiliary loudspeakers are selected to be smaller than the radiating loudspeaker and the number of auxiliary loudspeakers is such that, taken together, they form an equivalent single driver which is matched to the radiating loudspeaker to provide the desired frequency performance of the loudspeaker system. Since the auxiliary loudspeakers are smaller than the radiating loudspeaker, the baffle cutout in the external baffleboard is larger than the cutouts in the internal baffleboard.

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: The present invention relates to a loudspeaker diaphragm which is provided with a rear load and the vibration characteristic of which is improved in that the work to be performed for compressing the air behind the loudspeaker diaphragm is reduced. For this purpose, the loudspeaker diaphragm is provided with openings so that the air located behind the loudspeaker diaphragm can escape. At the same time, the introduction of the openings causes a decoupling of the vibrating diaphragm parts with respect to the frequency response when the loudspeaker diaphragm and the openings are suitably dimensioned, so that it is predominantly the inner part of the loudspeaker diaphragm which vibrates in the case of high notes, while the entire loudspeaker diaphragm vibrates in the case of low notes.

Abstract: A loudspeaker enclosure is formed generally in the shape of a tetrahedron, having a triangular bottom panel and three upstanding triangular side panels. In a first embodiment, the lower edges of the three side panels are connected to the three edges of the bottom panel, and the upstanding edges of the side panels are connected together. One or more speakers are mounted in respective apertures formed through the front side panel of the enclosure such that the sound waves generated thereby are directed forwardly therefrom. Another speaker is supported within the enclosure facing generally downwardly, but is angled toward the front side panel of the enclosure. The sound waves generated by the downwardly facing speaker are emitted through an opening formed through the lower end of the front side panel.

Abstract: A subcompact woofer speaker cabinet system provides high volume low frequency response, long speaker life without overload and sound projection over considerable distances. This is achieved by mounting a damped speaker diaphragm within a cabinet enclosure having a single projection opening for soundwaves expanded by an internal panel forming a common wall between substantially an exponentially diverging output horn and a converging pathway from the speaker front into the output horn, wherein the panel first compresses the wavefront from the speaker diaphragm into the horn and then expands the wavefront to project low frequency audio outwardly from the cabinet system. Lower audio frequencies in the order of 100 Hz or less are faithfully reproduced and projected in a cabinet having major dimensions only slightly larger than the diameter of the speaker.

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: Keyboard instruments incorporating sound systems for generating musical tones are disclosed. In a first keyboard instrument, speakers are mounted near a keyboard, and are arranged upright to be directed to the keyboard on the front side, thereby allowing a performer to clearly grasp the sound quality of performance tones. In a second keyboard instrument, which comprises a Helmholtz resonator consisting of a resonance port and a cabinet, an electro-acoustic transducer mounted on the outer surface of the cabinet and a driver for driving the transducer so as to cancel an air counteraction from the resonator, the size of a sound system is reduced, and the frequency characteristics, especially the low-frequency reproduction characteristics of the sound system are improved.

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: 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: 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: 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: 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 (10) has speaker mounting walls (11 and 12) joined at an apex angle (15) of 70.degree. or less, with a pair of tweeters (20) mounted as close to the apex as possible and a pair of woofers (25), arranged below the tweeters, and also mounted as close to the apex as possible. The width spanned by tweeter pair (20), from a viewpoint in front of apex (15), is approximately equal to the frontal width of either tweeter. Similarly, the width spanned by woofer pair (25), from a viewpoint in front of apex (15), is approximately equal to the frontal width of either woofer. The geometry of this mounting arrangement produces even acoustic intensity throughout a wide angle around both sides of the apex and preserves stereo identity by having the sound emanate from an apparently small source.

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 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 improved sound reinforcement enclosure is disclosed which incorporates a cone-type loudspeaker operating into a generally cylindrical channel extending from the perimeter of the cone to free air. A central member is coaxially mounted within this channel, the central member having rear surfaces substantially parallel to the surface of the cone and external surfaces which, with the internal surfaces of the channel form an annular region, the central member also having at least one coaxial internal passage forming a concentric horn flare. Methods of coaxially mounting a high-frequency compression driver behind the magnet assembly of the loudpseaker and of mounting a second loudspeaker internally in an enclosure are also disclosed.

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 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 loudspeaker system includes a cabinet with top, bottom, front, rear and side panels enclosing a volume with the top and bottom panels extending to one side of the enclosed volume and supporting an angled tweeter baffle therebetween that supports a tweeter that radiates rearward and outward from its front surface and forward and inward from its back surface. The side panels adjacent to the tweeter baffle are angled with the front angled side panel formed with an opening accommodating a port tube. The tweeter is a cone loudspeaker driver having a basket formed with openings exposing the cone to the rear.

Abstract: A marine seismic streamer cable having both pressure responsive and acceleration responsive transducers disposed therein. The accelerometer responds to acceleration along one axis regardless of its orientation about the other axis. The accelerometer is mounted in the streamer cable and responds to accelerations produced by a seismic source but is insulated from the noise and motion produced as the streamer cable is towed through the water.

Abstract: A loudspeaker is provided for high-quality and particularly stereophonic sound reproducing systems positioned close to a wall of a room. To reduce distortion due to that part of the reflected sound which arrives from substantially the same direction as the direct sound, the positioning of the sound radiating surfaces is such as to make the reflected sound from the wall arrive substantially in phase with the direct sound throughout a large frequency range, while at higher frequencies the reflected sound is attenuated by a sound absorber.The loudspeaker has a casing with a rear wall (5a). Loudspeaker units arranged to be the sound source for mid-range (12b) and/or high (14a) frequencies has the sound radiating surfaces (12b, 15a) at short distance (D2, D1) from the plane of the rear wall (5a) and facing slantwise forwards.

Abstract: A loud-speaker of a closed or a bass-reflex type, wherein a plurality of speaker units are intensively arranged behind an opening of a baffle board or a throat of a sounding horn with the sound wave radiating direction thereof being concentrated toward the center axis of the opening of throat, and the total area of the entire diaphragms of the speaker units is made substantially equal to, or larger than, the area of the opening or throat.

Abstract: A loudspeaker unit having an improved quality of bass reproduction for use in a stereo system with a second unit, which is a mirror image of it, to provide a better three-dimensional feeling on hearing the reproduced sound and to provide an increase in the area of the sound producer or source which includes a bass or woofer loudspeaker housed in a chamber, whose volume, together with the properties of the loudspeaker, is so designed that a desired resonant frequency is produced. An exponential horn is placed at an opening of the chamber, whose design is based on a Helmholtz resonator, whose captive air volume takes over the function of an active diaphragm, and the resonant frequency of the horn resonator has a specific relation to the resonant frequency of the chamber and the loudspeaker.

Abstract: A corner mounted sound reproduction speaker apparatus is adapted to be mounted in a corner space defined in part by a pair of intersecting vertical surfaces and includes a hollow enclosure housing having a base and a pair of imperforate side faces adapted to engage and to overlie the respective ones of the pair of vertical surfaces. The enclosure housing also includes an inclined front face of a generally triangular shape. Speaker devices are mounted within the interior of the enclosure housing behind the front face and are adapted to be energized by a sound reproduction system, the speaker devices having a response in the range of about 20 cycles per second and about 20,000 cycles per second. The plane of the base is disposed at an angle relative to the axis of radiation of the speaker devices, and the angle is an angle between about 35.degree. and about 50.degree. so as to enable a pair of such speaker units to be employed in opposite corners of a room to produce a stereo effect throughout the room.

Abstract: Disclosed herein is a speaker system for mounting in a vehicle wherein a passive radiator is provided in the interior of the speaker system. The speaker system is mounted on the rear window tray or shelf of the vehicle so that the radiating surface of the passive radiator faces the rear glass window of the vehicle to thereby produce a horn effect. Due to the horn effect, the lower sound spectrum is fully reproduced.