Abstract: An acoustic system for applying vibratory energy including a horn connected to an ultrasonic energy source. The horn defines an overall length and wavelength, and at least a leading section thereof is comprised of a ceramic material. The leading section has a length of at least ? the horn wavelength. In one preferred embodiment, an entirety of the horn is a ceramic material, and is mounted to a separate component, such as a waveguide, via an interference fit. Regardless, by utilizing a ceramic material for at least a significant portion of the horn, the ultrasonic system of the present invention facilitates long-term operation in extreme environments such as high temperature and/or corrosive fluid mediums. The present invention is useful for fabrication of metal matrix composite wires.

Abstract: This invention provides a lens system for a loudspeaker. The loudspeaker may include a driver unit and a waveguide attached to the driver unit. The loudspeaker further may include a lens system. The lens system may include a plurality of plates. The plates may be positioned to divide an interior of the waveguide into a plurality of acoustic paths of substantially equal length. The acoustic paths may bend the propagation of one or more acoustic elements of a sound wave so that each acoustic element arrives at a plane substantially at the same time.

Abstract: A horn including a substantially flat coupling flange defining a coupling flange plane, a substantially planar mouth defining a mouth plane, an elongated throat extending between the coupling flange and the mouth, a transducer for generating a sonic output operationally connected to the coupling flange, and a major axis extending through the elongated throat. The coupling flange plane and the mouth plane are nonparallel and define a horn angle. The major axis connects the coupling flange and the mouth and the elongated throat is characterized by a substantially steadily increasing sectional area along the major axis from the transducer-connecting end to the mouth connecting end.

Abstract: An acoustic transducer provided with at least one sound source for generating an acoustic centre and a predetermined construction for guiding sound generated by the acoustic centre, which acoustic transducer can be fixed to a fixing wall, wherein the predetermined construction is so designed that, during operation, the generated sound is displaced by the predetermined construction to a displaced acoustic centre at a location that is on the fixing wall (5), when the acoustic transducer (10) is fixed to the fixing wall (5).

Abstract: A low frequency exponential/hyperbolic hybrid folded horn enclosure intended for use in proximity with at least one planar surface, such as a floor, ceiling, or wall, with access to the horn throat from the top of the enclosure. The horn is bifurcated at the throat and folds horizontally around a central trapezoid-shaped vertical back chamber which is reflex ported for enhanced low frequency response below the frequency cutoff of the horn. The back chamber outer sides define part of the horn channel, resulting in a relatively simple structure with a small footprint and no void internal space. The throat exponential expansion cross-sectional area is consistently maintained while the proportions of the throat channels are elongated to the height of the enclosure.

Abstract: A speaker apparatus is a bass-reflex type woofer used in a speaker system, and includes a body portion for housing a speaker unit and a bass-reflex port mounted and fixed in the body portion. Further, in the speaker apparatus, a protrusion for temporarily fastening the bass-reflex port in the case of mounting and fixing the bass-reflex port is provided in the body portion.

Abstract: This invention provides a radiation boundary integrator (“RBI”) for integrating sound radiation from mid-range and high-frequency sources in multi-way loudspeakers. The RBI is a substantially solid boundary that is placed over the mid-range speakers to provide smooth, wave-guiding side walls to control the angular radiation of the high-frequency sound waves emanating from the high-frequency sound sources. To allow the mid-range frequency sound waves generated from mid-range sound sources to pass through the RBI, the RBI is designed with openings. To further prevent the possibility of having high-frequency sound radiate through the openings in the RBI, the RBI may be designed with porous material in the openings of the RBI. The porous material would be transparent to the mid-range sound radiation, but would prevent the high-frequency sound radiation from being disturbed by the openings in the RBI.

Abstract: A midrange loudspeaker for operation in conjunction with low-frequency and high-frequency loudspeaker modules in a theater sound system, having a reduced depth for deployment in limited space. The midrange module is configured with a plurality of drivers and a waveguide unit that provides uniform sound coverage throughout a theater auditorium with substantially seamless crossovers at 250 Hz and 1.5 kHz and with the vertical beam-width held substantially constant by an electrical filter network.

Abstract: The invention relates generally to the field of audio loudspeaker enclosures, and more particularly to a method of mounting the internal components in the loudspeaker so as to control the loudspeaker output. Specifically a mounting structure and method for mounting the loudspeaker horn to its associated compression driver are disclosed. The mounting structure allows the directivity of the loudspeaker output, and the frequency/phase control of the loudspeaker, output to be controlled by the spatial arrangement of these components in the loudspeaker enclosure.

Abstract: This invention provides a two-stage phasing plug located within a compression driver. The two-stage phasing plug housed within the compression driver may be coupled to a horn. The two-stage phasing plug includes first and second phasing plugs. The advantages of having a two-stage phasing plug is that the first and second phasing plugs may be simpler to manufacture, cost less and the overall dimensional tolerances may be tightly controlled. The higher dimensional tolerances may be obtained because the first phasing plug may be made from a unitary work-piece, and therefore, may be tooled and cut in the same machining set up. This allows the unitary work-piece to be machined and cut very accurately when compared to assembling separate components together during the manufacturing process. Since the most dimensionally critical area is the rear side of the first phasing plug, the tolerances of the second phasing plug may not be as critical.

Abstract: A waveguide system for radiating sound waves. The system includes a low loss waveguide for transmitting sound waves, having walls are tapered so that said crosssectional area of the exit end is less than the cross-sectional area of the inlet end. In a second aspect of the invention, a waveguide for radiating sound waves, has segments of length approximately equal to A ⁡ ( y ) = A inlet ⁡ [ 1 - 2 ⁢ Y B + ( Y B ) 2 ] where l is the effective length of said waveguide and n is a positive integer.

Abstract: A collar-mounted animal training device includes a piezoelectric transducer device (6) attached to a mylar cone acoustic element mounted in a transducer housing (5) configured as a resonant sound port. The piezoelectric transducer is driven by circuitry including a microcontroller (31), a voltage booster circuit (34), and driver circuitry coupled to the booster circuit and producing a boosted drive signal to the piezoelectric device (6). The microcontroller stores data representing a plurality of sequential segments each having a start and stop time and a start and stop frequency. The microcontroller sequentially produces a plurality of output signals having a start and stop times and frequencies.

Abstract: The invention relates to a horn loudspeaker system. The horn loudspeaker system includes a pair of vertically displaced horns with cross-fired aiming angles. A common throat section couples the horns to a driver. A substantially asymmetrical baffling is incorporated into the loudspeaker system to further improve the acoustic performance. One advantage of the unique horn loudspeaker system is that it provides a wide horizontal directivity response. Another advantage is that it provides a narrow vertical directivity response.

Abstract: An upper base/low mid loudspeaker comprises a conical driver and a channel defined by a housing and a central member. The central member has a portion extending into the cone to form a first generally ring-shaped region whose cross-sectional area increases in the direction of sound propagation. A second generally ring-shaped region is defined between a portion of the housing and a portion of the central member. The cross-sectional area of the second region decreases in the direction of sound propagation. The channel continues with a throat and a horn.

Abstract: The present invention relates to a compound loudspeaker. In the loudspeaker, the L.F. drive unit has a curved flexible diaphragm whose shape is determined such that it optimally controls the directivity of the compound loudspeaker to produce matched directivity of the L.F. and H.F. drive units. The L.F. diaphragm drive unit radiates sound by the controlled flexure of its diaphragm and thus, eliminates the need for a flexible rolling seal at the edge of the diaphragm. This allows for a continuous smooth surface to exist between the H.F. drive unit and the exterior of the loudspeaker, thereby greatly improving its radiation characteristics.

Abstract: A sub-woofer system with a flat horn for use in a vehicle which is capable of achieving an improved sound reproducing performance as well as an excellent space factor by mounting the horn on the floor of the vehicle. The sub-woofer system includes a flat horn having a proximal end and a distal end where the proximal end is connected to the drive unit for guiding the sound produced by the drive unit. The flat horn is substantially uniform in thickness throughout while gradually increases in width toward the distal end. The drive unit is positioned under a front seat of the vehicle and the flat horn is placed on a floor of the vehicle, and wherein an end opening of the flat horn at the distal end thereof is positioned at a fire wall of the vehicle to exhaust the sound from the drive unit.

Abstract: A loudspeaker system of improved clarity, coherence and uniformity of energy distribution containing mid frequency sound chambers with an annular input and approximately rectangular output for use in multi-way co-axial horn loaded line array systems. The sound chambers propagate the annular mid frequency sound wave co-axially with a high frequency sound wave, gradually changing the cross section of the mid frequency wavefront resulting in co-linear acoustic mid and high frequency wavefronts from multiple devices which range from the shape of a flat ribbon to that of a curved ribbon. The sound chambers may be arrayed contiguously and placed at the entrance of a suitable waveguide to form a wide band width acoustic line source of extended length and controlled beamwidth.

Abstract: A horn loudspeaker comprises: a horn (22) having a throat (26) and a mouth (30); a primary electro-acoustic driver (24) mounted at or adjacent the throat of the horn and directed generally along the horn; and at least one secondary electro-acoustic driver (32T, 32B, 32L, 32R) mounted part-way along the horn and directed generally across the horn. The secondary driver(s) can be used to change the local impedance conditions in the horn and therefore to change the polar response of the horn loudspeaker. At least one filter (12A, 12E) is provided for filtering an input signal (34) for the primary driver to produce a filtered signal for the primary driver or each of the secondary drivers. Such a filter may be chosen or designed so as to optimize some aspect of the polar response of the horn loudspeaker, for example to increase directivity, or flatten the polar response within a specified included radiation angle, or to increase omnidirectionality.

Abstract: A loudspeaker system containing wave-shaping sound chambers with approximately rectangular inlets and outlets of substantially the same size that are used to flatten or control the curvature of the acoustic wavefronts contained within system waveguides. Control of the degree of curvature of the wavefront enables the development of a wide variety of multi-waveguide arrays. The sound chambers are placed between a waveguides and a flattened conical horns of secondary waveguides. The sound chambers transform the curvature of the typical fan shaped wavefront that results from a conical horn throat into a wavefront that approximates a planar or curved rectangular ribbon of sound.

Abstract: A directional speaker system includes an enclosure having an inner surface, an outer surface, an open end, and a closed end, a speaker driver directed toward the open end and mounted near the closed end of the enclosure, an in-line phase plug mounted in front of the speaker driver for manipulating the wavefront of sound waves produced by the speaker driver, and a preferably frustoconical shaped wave guide provided between the speaker driver and the open end of the speaker enclosure. A preferably annular space is provided between the enclosure and the wave guide and a plurality of openings are provided between the enclosure at the open end of the enclosure. Out-of-phase sound waves produced by the speaker driver travel into the space and exit the speaker system through the openings.

Abstract: A loudspeaker is disclosed in which a cone driver operates into one end of an acoustic channel having acoustically closed sides and an acoustically open front. A longitudinally extended member is mounted directly in front of, and in alignment with, the driver, so as to restrict the free space within the channel. The rear of the longitudinally extending member effectively extends within the voice coil former, such that the volume defined between the rear of the longitudinally extending member and the loudspeaker is an annulus. The profile of the longitudinally extending member differs in its vertical and horizontal planes so as to provide a lower acoustic impedance in one plane than in the other.

Abstract: A first feature of the present invention is that the opening of a sound output port 3b is smaller in area than the opening of a sound input port 3a in a horn 3. A second feature is that the sound output port 3b of the horn 3 is located so as not to be in the way of a center axis of sound radiation from a speaker 2. A third feature is that a length L of the horn 3 is set at 370 mm or below. A fourth feature is that the horn 3 is gradually narrowed such that vertical sections thereof from the sound input port 3a to the sound output port 3b respectively have areas based on a predetermined rule. Thus, it is possible to realize a speaker apparatus in which a sound output port of a horn is smaller in area than a vibrating surface of a speaker while reproducing sound whose quality is equal or similar to that in conventional speaker apparatus, and a television set equipped with the speaker apparatus.

Abstract: A full-frequency-range cinema loudspeaker system intended or deployment in limited space behind a perforated cinema screen is configured as three modules: (1) a high-frequency module having a compression driver working into a horn-shaped waveguide that is specially shaped to compensate for beam-spreading effects of the perforated screen, (2) a midrange module providing a specially shaped waveguide with a multiple throat portion that mounts four cone-type drivers in a vertical array, the four individual throat regions merging into a common mouth portion of the waveguide that flares out to the front of the module, and (3) a vented-port low-frequency module with two cone-type low-frequency loudspeaker units. The three modules are stacked with the high-frequency module on top and the low-frequency module at bottom; The modules are all made to have a uniform width and a depth of under eighteen inches.

Abstract: A speaker includes a disk-shaped base. A substantially hemispherical surface vibrator is fitted into a substantially circular groove provided in the base and bonded therein. Terminals are attached to electrodes provided on both surfaces of the vibrator. The terminals, passing through the terminal grooves provided in the base, are led out in a direction that is substantially perpendicular to the plane of the base. Further, a horn as a separate member may be attached to the outer surface side of the vibrator.

Abstract: A high-frequency cinema loudspeaker module for deployment behind a perforated cinema screen is configured with a waveguide to compensate for the beam-spreading effects of the perforated screen at the high end of the frequency range and to facilitate and co-ordinate integration with a complementary midrange module of a total sound system in providing defined coverage in a theater. A compression driver is coupled to a waveguide that is specially shaped to narrow the horizontal beamwidth at the higher frequencies affected by the perforated screen, and thus provide compensation that results in a more uniform overall defined sound coverage in the theater within the designated high-frequency range. The module is configured with the driver and waveguide axes inclined downwardly at an angle of 6 degrees from horizontal to facilitate overall coverage.

Abstract: The present invention relates to systems and methods for sound reproduction employing a unity summation aperture loudspeaker horn taking advantage of the frequency response of horn flare characteristics for positioning of audio drivers along the outer wall of the loudspeaker horn. The loudspeaker horn may be embodied as any of a variety of pyramid shapes which allows for sections for driver positioning in correlation with the frequency response of the horn. Positioning the driver sources along the sides of the horn and out of the way of the audio field facilitates at least two modes of operation including a transformation operation for acoustical impedance matching and a waveguide operation for directing the reproduced audio signals. The single horn, multi-driver approach provides highly coupled audio drivers to generate sound reproduction employing unity summation aperture loudspeakers.

Abstract: A loudspeaker horn, loudspeaker and a loudspeaker system wherein at least one loudspeaker includes a horn composed of a waveguide, a plurality of throats acoustically coupled to a single waveguide at their mouths and to respective drivers of a plurality of drivers at their inlets. The axis of the throats form an arc in the plane of the long axis of the waveguide to optimize energy distribution in this plane.

Abstract: A sound enhancer for use with a speaker assembly having front and rear sides, comprising an enclosure forming first and second hollow portions, the enclosure defining a cradling zone to receive the speaker assembly in an angularly cradled position; the first hollow portions defining an inlet to directly receive sound transmitted from the rear side of the speaker assembly, in a direction opposite to sound transmission from the front side of the speaker assembly; and the enclosure hollow portions having walls to re-direct sound received by the enclosure first hollow portion into the enclosure second hollow portion, and then toward an outlet defined by enclosure second hollow portions. A doubled-up, series megaphone effect is achieved.

Abstract: A loudspeaker system of improved clarity, coherence and uniformity of energy distribution containing mid frequency sound chambers with an annular input and approximately rectangular output for use in multi-way co-axial horn loaded line array systems. The sound chambers propagate the annular mid frequency sound wave co-axially with a high frequency sound wave, gradually changing the cross section of the mid frequency wavefront resulting in co-linear acoustic mid and high frequency wavefronts from multiple devices which range from the shape of a flat ribbon to that of a curved ribbon. The sound chambers may be arrayed contiguously and placed at the entrance of a suitable waveguide to form a wide band width acoustic line source of extended length and controlled beamwidth.

Abstract: The invention presents a design of optimum edges for antennas of loudspeakers, microphones, hydro-speakers, hydro-phones, brass and wind instruments, and ultrasonic transducers. These edges have a serrated-roll shape, and enhance the acoustical field strength uniformity. Loudspeakers, hydro-speakers, and ultrasonic transducers will become more effective in radiating acoustical power. The quality of these apparatuses are enriched. The musical tone emitted by loudspeakers, brass and wind instruments becomes more smooth, mellow, rich, clean, and elegant.

Abstract: An electric horn structure with the trumpet body and resonator in one piece. The body is seamless and comprises a pipe section as the resonator and trumpet section, wherein the trumpet section further comprises an outward hook-shaped reinforced rim at the larger diameter end of the trumpet section. By providing the seamless one-piece horn structure, the electric horn utilizing the present invention can have stable vibration-and-sound wave conversion, excellent sound quality, extended lifetime, small size and high performance capability.

Abstract: An improved loudspeaker system which increases low frequency directivity and minimizes directivity discontinuities during frequency transitions includes a first low frequency transducer, a second low frequency transducer, a middle frequency transducer assembly and a middle frequency horn assembly having a small input aperture and a large output aperture. The middle frequency transducer assembly is attached at the small aperture of the horn assembly and directs a middle frequency acoustical signal into the horn assembly. The low frequency transducers and are mounted to opposite interior surfaces, preferably the top and bottom surfaces, of the horn assembly, and direct a low frequency acoustical signal into the horn assembly. A composite acoustical signal directed out of the horn assembly from the large aperture. The distance D.sub.1, measured from the upper transducer voice coil to the lower transducer voice coil, is substantially equal to 0.9048 of the distance D.sub.

Abstract: An improved acoustic horn for loudspeakers is provided. The acoustic horn of the referred embodiment of the present invention includes a one piece body that incorporates damping material within the body. Preferably, the one piece body is slotted and vibration damping material is provided within the slots. The horn is fabricated by casting from suitable metals and metal alloys. In the preferred embodiment, the body comprises four outwardly curved and flared side walls and is generally rectangular. Each wall of a pair of the opposed side walls is cast with a slot. Vibration damping material is provided in each slot to substantially reduce the structural resonances of the one piece body, so that the acoustic horn has enhanced vibration damping. Various vibration damping materials that are flexible relative to the body and have a high loss tangent are used. Suitable materials include hot melt adhesives, epoxy resins, and commercially available elastomeric materials.

Abstract: A loudspeaker horn, loudspeaker and a loudspeaker system wherein at least one loudspeaker includes a horn composed of a wave guide, a plurality of throats acoustically coupled to a single wave guide at their mouths and to respective drivers of a plurality of drivers at their inlets. The axis of the throats form an arc in the plane of the long axis of the wave guide to optimize energy distribution in this plane.

Abstract: A loudspeaker system including at least one enclosure incorporating a wave guide having a curved input slot through which sound waves generated from an acoustic transducer are introduced by way of an acoustic chamber and wherein the curvature of the slot and the orientation of opposite side walls of the enclosure are such that sound ways propagated within the wave guide exit the wave guide in a geometric configuration of a segment of a torus and so that sound waves from side-by-side enclosures form a common non-interfering wavefront.

Abstract: An improved horn-type loudspeaker system for reproducing an acoustical signal from a corresponding electrical signal includes transducer assembly, an acoustical transformer and an output horn assembly. The transducer assembly includes an inner driver cone, an outer driver cone and a dust cap constructed such that the direct path length from the voice coil to the outer driver cone periphery is substantially equal to the distance from the voice coil to the dust cap peak. Mechanical vibrations produced by the voice coil propagate to the outer driver cone periphery and to the dust cap peak in the same amount of time; thus the acoustical signals transmitted by the outer driver cone periphery and the dust cap peak are substantially time-coherent. The acoustical signal transmitted by the transducer assembly is directed toward the horn assembly by an acoustical transformer through plurality of radial waveguides.

Abstract: An acoustic horn transducer with a conic type diffuser has an exponential profile. The diffuser is formed from wood and has an axial length less than its maximum outer diameter.

Abstract: An acoustic annunciator which includes resonating cavity, a piezoelectric element, and a folded horn which are each selected to have a different resonance frequency so as to expand the frequency range of the output of the annunciator. The folded horn includes a cone defined by a main body portion and an outer horn which is rotatable and axially displaceable with respect to the main body portion. The outer horn is designed to rotate to prevent the annunciator from being snagged or caught by objects. The outer horn is designed to be axially displaceable in order to access and remove debris from inside the annunciator. In addition, the acoustic annunciator includes a driver that faces downward during use. This orientation of the driver allows for drainage while preventing the ingress of rain and/or snow.

Abstract: A phase plug for a horn loaded speaker has a frustro-conical body with a spherical entrance end and a planer outlet end. The plug is formed with radial channels. The entrance of the phase plug and the speaker diaphragm are conformal and the channels have generally equal aperture area from the entrance to the outlet, or slightly increasing aperture areas so as to minimize diffraction The truncation surface is defined by the intersection of the sidewalls of the conical body and the cone angle of the horn.

Abstract: A speaker enclosure for controlling an air pressure differential across a front and rear portion of a speaker cone comprising an enclosed rear chamber in communication with a primary channel having a constant cross-section, the primary channel in open communication with a convergence channel having a cross-section smaller than that of the primary channel, terminating in an orifice. In an alternate embodiment, a pair of speakers are utilized in a pair of enclosed rear chambers, each rear chamber in open communication with a primary channel of constant cross-section, each primary channel converging and joining in open communication with the convergence channel and terminating in an orifice. Additional embodiments include speaker enclosures with a front chamber adjacent a front side of the speaker to produce a pressure differential between the front chamber and the ambient air. The front chamber may have a sized opening to produce a regulated pressure flow.

Abstract: A loudspeaker horn has straight wall section and a curved wall section. The straight wall section has diverging walls defining a coverage angle and the curved wall portion is connected to the straight wall portion at a point tangent thereto, and has a proximal end disposed perpendicular to the plane of the throat entrance. At least one coverage angle in orthogonal planes has a common apex in the plane of the throat entrance and along the horn axis.

Abstract: A directional speaker system includes an enclosure having an inner surface, an outer surface, an open end, and a closed end, a speaker driver directed toward the open end and mounted near the closed end of the enclosure, an in-line phase plug mounted in front of the speaker driver for manipulating the wavefront of sound waves produced by the speaker driver, and a preferably frustoconical shaped wave guide provided between the speaker driver and the open end of the speaker enclosure. The in-line phase plug preferably has a plurality of channels. The open end of the enclosure is preferably provided with an acoustically absorbent material around its inner perimeter. A second acoustically absorbent material is provided between the speaker driver, the in-line phase plug, and the wave guide, and the speaker enclosure. The in-line phase plug, wave guide phase plug and baffle plate operate to flatten the wavefront.

Abstract: A loudspeaker includes a compresion chamber, a first electroacoustic transducer and a horn. The first electroacoustic transducer is disposed inside the compression chamber. The horn is mechanically and acoustically coupled to the first electroacoustic transducer. The loudspeaker also includes a second electroacoustic transducer. The second electroacoustic transducer is disposed outside the compression chamber. The second electroacoustic transducer is mechanically and acoustically coupled to the horn.

Abstract: A sound apparatus capable of obtaining a clear sound (audio image) irrespective of a position of a speaker portion to be provided in the sound apparatus. The sound apparatus includes a speaker portion and a plurality of sound guides each of which has one end portion connected to the speaker portion and has the other end portion opened; wherein lengths of the plurality of sound guides are nearly equal to each other and the other end portions of the sound guides are arranged such that sounds generated from the speaker portion are guided through the sound guides and collide with each other.

Abstract: The present invention is a waveguide device having a body of molded, foam plastic with a speaker end and an open end and an even number of segments with a flat surface in a plane parallel to the speaker end. The segments have inside wall surfaces which flare increasingly outwardly from the speaker, and these inside wall surfaces have a speaker end length, L.sub.1, determined by the following formulas, L.sub.1 minimum=0.7.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, and L.sub.1 maximum=1.2.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SE, wherein L.sub.1 is a straight line length of the lower portion of the segment wall surface, w.sub.s is the weight of a speaker cone in grams/cm.sup.3, and A.sub.SE is the cross-sectional area of the speaker end in square centimeters. The waveguide body also includes an end plate with a speaker face and anchor inserts for attachment of a speaker thereto. The anchoring inserts are embedded in the waveguide body.

Abstract: Method and apparatus applied to loudspeakers of the type having an electrically driven diaphragm in an acoustic housing to reduce distortion from two sources. 1. Loss of high frequencies when sound from different regions of the diaphragm travel paths of different lengths and neutralize each other when they meet out of phase. 2. Noise generated primarily by the central region of the diaphragm when driven at high power. A compensating or phase plug is suspended axially within the housing adjacent the central region of the diaphragm. The plug, in cooperation with the walls of the housing, directs the sound through paths of uniform length to reduce loss of high frequencies. The plug has a sound absorbing inner portion adjacent the central portion of the diaphragm for absorbing the noise generated by the central portion at high power.

Abstract: A loudspeaker system having a cross-cabinet horizontal array of loudspeakers for collectively generating a common acoustical wavefront when respective drivers associated with each of the loudspeakers of the array are similarly driven. The loudspeakers are secured to each other such that adjoining horn side walls for adjacent ones of the loudspeakers are substantially parallel to each other and are relatively deep in relationship to the total length of the loudspeakers, i.e., the length of the sidewalls is about 80% of the depth of the entire loudspeaker. Each horn is angled about 30 degrees off a central axis thereof to provide 30 degrees coverage in the horizontal plane and includes a first, essentially untapered, section which provides the aforementioned coverage in the horizontal plane and a second section having a taper of about 30% to prevent diffraction of the wavefront at the edges of the horn.

Abstract: A bass amplifying system (10) for radios (100) having mounted speakers; wherein, the system (10) comprises a combined enclosure and support unit (11) including a cover member (30) pivotally associated with a base member (20) having an elevated support platform (26) dimensioned to receive a radio (100); wherein, the cover member (30) and the base member (20) are provided with acoustical insulating means (36), (26), (37) for capturing sound waves within the interior of the enclosure and support unit (11) and redirecting the sound waves through an acoustical horn (28) formed in the base member (20).

Abstract: A speaker assembly comprising an elongated unitary member having a first end and a second end. The elongated member is formed into a generally box-shaped configuration having an open top, an open bottom and an internal box cavity. The first and second ends of the elongated member are separately positioned within the internal box cavity to form first and second internal sidewalls, respectively. First and second internal sidewalls define a sound path therebetween which is in communication with the internal box volume and an external portion of the elongated member. A first speaker is disposed in the first internal sidewall and a second speaker is disposed in the second internal sidewall, with first and second speakers facing directly into the sound path. A top panel is mounted on the elongated member over the open top and a bottom panel is mounted on the elongated member under the open bottom.

Abstract: A speaker system provides good acoustic characteristics for use in visual equipment, by controlling the turbulence in mid-range of response frequency characteristics to be flat so as to produce an excellent speech articulation. This is accomplished by coupling an acoustic pipe to the front of a speaker unit to guide sound waves through an opening of generally rectangle shape. A resonance absorption section is formed by a tube, one end of which forms a hole for absorbing sound facing to a sound path running within the acoustic pipe from the front of speaker unit to an opening, and a cavity having a small gap along the edge, except the area where is coupled through with the other end of tube. By constructing the speaker system in this way, the width of band to be absorbed and the Q of a dip can be controlled to suppress the peaks and dips, thereby providing a speaker system of good acoustic characteristics where the response frequency characteristics are flat and the speech articulation is excellent.