Abstract: A multi-driver multi-channel single enclosure Height-Channel (e.g., ATMOS® or DTS-X®) enabled soundbar loudspeaker system 260 uses a novel signal processing system, driver mounting configuration (310L, 310R) and method to provide a high fidelity home theater listening experience, in a manner which relies on a new method for cancellation of unwanted direct (not ceiling-bounced) radiation of the Height-Channel (or virtual height envelopment) channel's sound 213DS.

Abstract: A diaphragm for use in an audio transducer (e.g., a coaxial loudspeaker) includes a higher frequency transducer and a lower frequency transducer. The diaphragm is a component of the lower frequency transducer and is arranged coaxially with the higher frequency transducer. The diaphragm includes a first surface and an opposing second surface. The first surface has a profile shaped to define a horn for output from the higher frequency transducer and the geometry of the first surface is independent of the geometry of the second surface.

Abstract: A speaker system comprises a first speaker subsystem comprising a first active driver and a first passive radiator that is forward facing; and a second speaker subsystem comprising a second active driver and a second passive radiator that is backward facing. The first speaker subsystem has a corner frequency that is a first predetermined harmonic of the resonance frequency of the first passive radiator, and the first active driver has a resonance frequency that is a second predetermined harmonic of the resonance frequency of the first passive radiator. The second speaker subsystem has a corner frequency that is the first predetermined harmonic of the resonance frequency of the second passive radiator, and the second active driver has a resonance frequency that is the second predetermined harmonic of the resonance frequency of the second passive radiator.

Abstract: A multi-stage mechanical suspension system extends a linear operating range for a loudspeaker and prevents mechanical damage on explosive peaks. The system includes a pair of spaced contact receivers that limit the travel of a contactor. The system provides a flat linear response at low frequencies as the contact receivers are intermittently or occasionally contacted by the contactor during operation of the loudspeaker. The system enables creation of different regions of non-linearity within a total stiffness versus deflection curve of a loudspeaker suspension system. The non-linearity in each region can be controlled individually, so long as the non-linearity by region increases moving away from the rest position. Thus, a plateau of substantially linear stiffness may extend for a large portion of the total displacement allowed for a voice coil and suspension components before a region of non-linear stiffness occurs only at the ends of an allowable excursion to limit the motion.

Abstract: A digital loudspeaker includes a substrate, a first stator fixed with respect to the substrate, a second stator fixed with respect to the substrate and spaced at a distance from the first stator, and a membrane between the first stator and the second stator. The membrane is displaceable between a first position in which the membrane mechanically contacts the first stator and a second position in which the membrane mechanically contacts the second stator. The first stator and the second stator are arranged to electrostatically move the membrane from a rest position spaced apart from the first position and the second position to the first position and the second position, respectively.

Abstract: An acoustic device intended to operate pistonically and in bending comprising a panel-form acoustic radiator, a magnetic drive system including a voice coil on a tubular bobbin, the bobbin being directly coupled to the radiator to drive the radiator directly; and a coupling device connected to the bobbin, and to the radiator at a position at or near to the first nodal line of bending resonance of the radiator. A method of improving the on-axis response of a loudspeaker having a panel-form radiator and intended to operate both pistonically and in bending, comprising driving the radiator by a directly connected tubular bobbin, and substantially suppressing the lowest natural frequency of the radiator by providing a coupler connected from the bobbin to the radiator at or near to its first nodal line.

Abstract: An electrodynamic acoustic transducer has a diaphragm and a frame with a pole piece carrying a bulbous waveguide tip which reduces or eliminates high frequency distortions caused by destructive interference within the transducer. The bulbous-tip structure clears the moving parts of the transducer and minimizes diffraction of sound energy, extending forward approximately to the plane defined by the outer periphery of the diaphragm when the diaphragm and voice coil are at rest. The bulbous-tip waveguide member extends radially outward above the central radiating area of the transducer diaphragm or cone so as to obscure the center portion of the diaphragm.

Abstract: An Electret Condenser Microphone (ECM) motor apparatus includes a diaphragm ring support structure, a charge plate, and at least one stitch. The diaphragm ring support structure defines an opening there through. The charge plate is disposed within the opening. The at least one stitch is coupled to the diaphragm ring support structure to the charge plate. The diaphragm is disposed adjacent to and in a generally parallel relationship to the charge plate. The stitch is configured to hold the charge plate and the diaphragm ring, and the stitch is configured to maintain a constant or nearly constant distance between the charge plate and the diaphragm in the absence of sound energy.

Abstract: A coaxial passive radiation monomer apparatus is disclosed. In accordance with an aspect of the present disclosure, there is disclosed a dynamic speaker monomer combined with a passive radiator in a single unitary structure located in spatial proximity with respect to one another to thereby and further comprising an elastic material at the base of the speaker assembly for enhanced and optimized resonance frequencies for the active and passive components of the overall device.

Abstract: A canalphone system may include a canalphone housing, and a first high frequency driver carried within the canalphone housing. The system may also include a second high frequency driver carried within the canalphone housing where the second high frequency driver is tuned with the first high frequency driver to deliver lower distortion than a standard canalphone high frequency driver and/or lower distortion than two standard canalphone high frequency drivers that are not tuned with each other.

Abstract: The invention relates to a loudspeaker system in which the diaphragm of the speaker has a defined material thickness particularly in the edge region thereof and comprises a suspension which is axially symmetrical about the mechanical rest position of said diaphragm and is formed by one, preferably two identical mirrored components, characterized in that the sound emission towards the rear is performed to at least 50 percent by the inner space of a magnetic system. The invention further relates to the use of the loudspeaker system as loudspeaker boxes or in radios, television screens, radio receivers, hand-held radio devices, measurement receivers, mobile telephones and headphones or the like.

Abstract: A micromachined microphone or speaker embedded within, or positioned on top of, a substrate suitable for carrying microelectronic chips and components. The acoustic element converts sound energy into electrical energy which is then amplified by electronic components positioned on the surface of the substrate. Alternatively, the acoustic element may be driven by electronics to produce sound. The substrate can be used in standard microelectronic packaging applications.

Abstract: A linear interleaved magnetic motor in which the B-field flows between a plurality of motor cell elements, creating a long, serpentine gap. The motor is used with at least one flex circuit as a drive coil. The motor can be used as a drive motor for a loudspeaker transducer. Multiple loudspeaker transducers can be connected together to make a loudspeaker frame or system.

Abstract: A speaker capable of suppressing deterioration of acoustic efficiency while allowing miniaturization of the speaker includes a first unit and a second unit each of which outputs sound. The first unit includes a diaphragm which vibrates back and forth to radiate sound; and plural suspensions which support, at different positions, an outer periphery of the diaphragm. At least one of air passages for channeling sound from the second unit to the outside is provided between the plural suspensions.

Abstract: An omnidirectional speaker having a high frequency driver, which generates sound over a high frequency range and which has a first diameter, and a high frequency waveguide having a second diameter larger than the first diameter. A first midrange driver and a second midrange driver have a third diameter and a fourth diameter, respectively. Each midrange driver generates sound over a middle frequency range and the first midrange driver faces the second midrange driver. First and second midrange waveguides have a fifth diameter and a sixth diameter, respectively, and correspond to the first and second midrange drivers, respectively. The fifth diameter is larger than the third diameter and the sixth diameter is larger than the fourth diameter. Both of the midrange frequency waveguides are positioned between the first midrange driver and the second midrange driver so as to block a direct path from the first midrange driver to the second midrange driver.

Abstract: A speaker. The speaker includes a housing, a first electrode, a second electrode, and a diaphragm. The housing has a first end, the first end which includes an acoustic aperture. The first electrode is positioned in the housing a first distance from the first end, and is biased to a first voltage. The second electrode is positioned in the housing a second distance, which is greater than the first distance, from the first end. The second electrode is biased to a second voltage. The diaphragm is positioned in the housing between the first electrode and the second electrode, and is biased to a third voltage. The speaker includes a valve. The valve opens when the diaphragm is moving away from the first end and closes when the diaphragm is stationary or moving toward the first end. When the valve is closed, the diaphragm forms an air-tight seal between the first end and the second electrode.

Abstract: A speaker assembly includes a speaker housing with a closed top wall that is substantially planar and forms a support surface. A first midrange driver and a first tweeter are mirror images of a second midrange driver and a second tweeter. A first support bracket supports the first midrange driver and first tweeter along a first side of the closed top wall adjacent the first sidewall of the speaker housing. The first support bracket includes a planar support surface which is obliquely oriented relative to a plane in which the closed top wall lies. A second support bracket supports the second midrange driver and the second tweeter along a second side of the closed top wall adjacent the third sidewall of the speaker housing. The second support bracket includes a planar support surface which is obliquely oriented relative to the plane in which the closed top wall lies.

Abstract: The invention relates to a 3.5 mm audio plug with built-in light source, particularly to a light-emitting element arranged in a hollow tube and two conductive portions and several insulating portions arranged on a predetermined position of a surface of the audio plug for acquiring power and supplying the power to the light-emitting element in order to form a laser pen. At the same time, the electronic products are able to maintain normal output sound from a speaker when the audio plug is inserted into the audio jack of the predetermined electronic product, avoiding missed calls. Moreover, the audio plug is arranged in the audio jack except the light-emitting hole; that is, the present invention is nearly integrated with the smartphone 70, which is not only beautiful but easy to carry.

Abstract: A line array speaker provides highly uniform frequency response throughout a wide listening field, while also reducing distortion and improving fidelity, clarity, and output level. In a symmetrical embodiment, central apertures are straddled by a sequential pairs of sets of apertures. The straddling pairs emit frequencies in the next lower frequency band relative to the frequency band of the immediately preceding frequency band apertures. In an asymmetrical embodiment, sequential frequency bands are emitted by adjacent sets of apertures rather than straddling pairs of sets of apertures. Each of the apertures may be a loudspeaker cone, one or more straight slots, one or more arbitrarily curved slots, one or more arbitrarily angled slots, one or more holes or the mouth of a horn. The speaker may have a front baffle which is a flat panel or multiple facets arranged in one or multiple recesses across a front of the speaker.

Abstract: An electrical device such as a headset may have a cable. Wires in the cable may be used to connect speakers in the headset to a connector such as an audio jack. The cable may have a tubular intertwined cable cover that covers the wires. Computer-controlled servo motors in fiber intertwining equipment may be adjusted in real time so that intertwined attributes such as intertwining density and intertwining tension are varied as a function of length along the intertwined cable cover. The fiber intertwining equipment may make these variations to locally increase the strength of the intertwined cable cover and the cable in the vicinity of a bifurcation in the cable and in the vicinity of the portion of the cable that terminates at the audio jack.

Abstract: Loudspeaker system including a housing and at least four transducers arranged therein. Each transducer includes a substantially circular diaphragm and the diaphragms are constructed with specific sizes such that the ratio of a diameter of each diaphragm to the diameter of an immediately larger diaphragm is between 1:1 and 1: Phi2(Phi=(1+?5)/2), preferably 1:Phi, and the ratio of the diameter of each diaphragm to an immediately smaller diaphragm, is between 1:1 and 1:(1/Phi), preferably 1:1/Phi. Moreover, the diaphragms are arranged such that centers thereof lie on a spiral, clockwise or counterclockwise, in ascending size order with the center of the smallest diaphragm being closest to the pole of the spiral. A microphone and single-diaphragm loudspeaker in which the diaphragm has a spiral shape are also disclosed.

Abstract: A microphone includes a housing; a back volume within the housing; a diaphragm within the housing; a backplate attached to the housing; and a diaphragm ring connected to the diaphragm. The diaphragm ring has a body defined by an outer perimeter and at least a first inner perimeter and a second inner perimeter adjacent the first inner perimeter. The first inner perimeter is adjacent to a top surface of the diaphragm ring. The second inner perimeter is adjacent to the bottom surface of the diaphragm ring. The second inner perimeter is smaller than the first inner perimeter.

Abstract: A transducer assembly includes a first electroacoustic transducer and a second electroacoustic transducer. The first and the second electrostatic transducers include an electrode and a counter electrode. An inner circumference of an outer diaphragm section lying within an outer circumference forms the counter electrode of the first electroacoustic transducer. An inner diaphragm section that lies within the inner circumference of the outer diaphragm section forms the counter electrode of the second electroacoustic transducer.

Abstract: The present invention relates to a loudspeaker in the acoustic field and the information communication field. The invention provides a loudspeaker that can realize a thinner size. To achieve this, the loudspeaker of the present invention is structured so that a part of a diaphragm is inserted to a dent or an opening formed at the center poles of a lower plate of a magnetic circuit. This structure allows the diaphragm to be stored within the height of the magnetic circuit, thus allowing the loudspeaker to have a thinner size.

Abstract: An exemplary speaker assembly includes a woofer, a tweeter, and a bracket supporting the tweeter within the woofer. The woofer includes a magnetic circuit unit defining a magnetic gap, a frame attached on the magnetic circuit unit, a diaphragm attached to the frame, and a voice coil attached to the diaphragm and extending into the magnetic gap. The bracket includes an outer ring fixed relative to the frame, an inner ring surrounded by the outer ring, and ribs interconnecting the outer ring and the inner ring. The tweeter includes a main body, a supporting body, and a confining body. The supporting body is partly received in and abuts against the inner ring.

Abstract: A speaker assembly includes a speaker housing with a closed top wall, an opposed open end and first, second, third and fourth sidewalls extending downwardly from the closed top wall. The closed top wall is substantially planar and forms a support surface. First and second midrange drivers and first and second high frequency drivers are mounted within the housing, wherein the first midrange driver and the first tweeter are mirror images of second midrange driver and the second tweeter. A first support bracket supports the first midrange driver and first tweeter along a first side of the closed top wall adjacent the first sidewall of the speaker housing. The first support bracket includes a planar support surface which is obliquely oriented relative to a plane in which the closed top wall lies. A second support bracket supports the second midrange driver and the second tweeter along a second side of the closed top wall adjacent the third sidewall of the speaker housing.

Abstract: A line array speaker provides highly uniform frequency response throughout a wide listening field, while also reducing distortion and improving fidelity, clarity, and output level. In a symmetrical embodiment, central apertures are straddled by a sequential pairs of sets of apertures. The straddling pairs emit frequencies in the next lower frequency band relative to the frequency band of the immediately preceding frequency band apertures. In an asymmetrical embodiment, sequential frequency bands are emitted by adjacent sets of apertures rather than straddling pairs of sets of apertures. Each of the apertures may be a loudspeaker cone, one or more straight slots, one or more arbitrarily curved slots, one or more arbitrarily angled slots, one or more holes or the mouth of a horn. The speaker may have a front baffle which is a flat panel or multiple facets arranged in one or multiple recesses across a front of the speaker.

Abstract: An exemplary speaker assembly includes a woofer, a supporting member, a fixing member and a tweeter. The woofer includes a magnetic circuit unit defining an air gap, a frame mounted on the magnetic circuit unit, a diaphragm received in and connected to the frame, and a voice coil extending through a center of the diaphragm. One end of the voice is secured to the diaphragm, and the other end of the voice coil is interposed into the air gap of the magnetic circuit unit. The supporting member is disposed on the magnetic circuit unit and enclosed by the voice coil. A top end of the supporting member extends through the diaphragm to an outer side of the diaphragm. The fixing member extends through the magnetic circuit unit to mount the supporting member on the magnetic circuit unit. The tweeter is secured to and supported by the supporting member.

Abstract: An electret condenser microphone is provided that can reduce parasitic capacitance and realize enhanced sensitivity. The electret condenser microphone includes a capacitor section including a fixed electrode having an electret member and a diaphragm electrode, a casing section housing the capacitor section, a circuit board including a converter circuit 4 for converting variations of capacitance of the capacitor section caused by vibrations of the diaphragm electrode to electric signals for output, and conducting elements for making the capacitor conductive with the circuit board, in which the casing section has a shape as viewed from top different from a shape of the capacitor as viewed from top to provide different distances between outer sides of the capacitor section and the casing section circumferentially of the capacitor section as viewed from top.

Abstract: An acoustic transducer comprises a substrate, a membrane configured to move relative to the substrate, a number of supports configured to suspend the membrane over the substrate, a first group of projections extending from the membrane, and a second group of projections extending from the substrate, the second group of projections being interweaved with and movable relative to the first group of projections, wherein each projection of one group of the first group of projections and the second group of projections is composed of a first conductive layer, a second conductive layer and a dielectric layer between the first conductive layer and the second conductive layer, and each projection of the other one group of the first group of projections and the second group of projections is composed of a third conductive layer.

Abstract: Loudspeaker system including a housing and at least four transducers arranged therein. Each transducer includes a substantially circular diaphragm and the diaphragms are constructed with specific sizes such that the ratio of a diameter of each diaphragm to the diameter of an immediately larger diaphragm is between 1:1 and 1:Phi2 (Phi=1+?5/2), preferably 1:Phi, and the ratio of the diameter of each diaphragm to an immediately smaller diaphragm is between 1:1 and 1:(1/Phi2), preferably 1:1/Phi. Moreover, the diaphragms are arranged such that centers thereof lie on a spiral, clockwise or counterclockwise, in ascending size order with the center of the smallest diaphragm being closest to the pole of the spiral. A microphone and single-diaphragm loudspeaker in which the diaphragm has a spiral shape are also disclosed.

Abstract: A speaker of the present invention includes the following: a diaphragm that includes an inner periphery coupled to a voice coil, and a corrugation provided at the intermediate position between the inner periphery and an outer periphery; a speaker edge for supporting the outer periphery of the diaphragm; and a damping member attached to an outer peripheral part of the diaphragm outside the vicinity of an outer periphery of the corrugation. The effective vibration area of an inner peripheral part of the diaphragm inside an inner periphery of the corrugation is substantially half or less of the total effective vibration area. The damping member is configured as a damping portion by extending an overlap portion of the speaker edge overlapping with the diaphragm to the vicinity of the outer periphery of the corrugation.

Abstract: A microphone system has a base coupled with first and second microphone apparatuses. The first microphone apparatus is capable of producing a first output signal having a noise component, while the second microphone apparatus is capable of producing a second output signal. The system also has combining logic operatively coupled with the first microphone apparatus and the second microphone apparatus. The combining logic uses the second output signal to remove at least a portion of the noise component from the first output signal.

Abstract: A combined headphone set including a speaker assembly. The headphone set includes a headband having a speaker headphone on opposing ends of the headband. Each of the speaker headphones includes an exterior speaker for public listening and an interior speaker for personal listening by the user. One of the speaker headphones includes switching means for listening to the interior speaker or to the exterior speaker or to the interior and exterior speakers simultaneously from each of the speaker headphones. Each of the speaker headphones includes an audio signal wire connected from an output jack of an audio device to the speaker headphones.

Abstract: An improved earphone transducer made of a first ring-shaped diaphragm covering the area of the earphone transducer perimeter to the transducer voice coil, and a second dome-shaped transducer covering the center space above the voice coil. The ring-shaped diaphragm and dome-shaped diaphragm have overlapping areas to facilitate integration into the transducer, and the dome shaped diaphragm has a surface anomaly at its apex to facilitate manufacture. The diaphragms are of differing thicknesses and/or hardness to produce a more dynamic sound response, and may also be made of different thermoplastic materials.

Abstract: A biplane line array speaker includes a line array of tweeters mounted substantially directly in front of a line array of woofers. The tweeter line array is arcuately shaped to provide controlled vertical dispersion above and below the boundaries of the speaker cabinet. The woofers are displaced from the tweeters in stepped manner. The speaker cabinet is a rectangular box, allowing efficient wall mounting in single or multiple unit columns. In multiple unit columns, the individual units acoustically couple to each other.

Abstract: A loudspeaker including a frame and a toroidal magnet that is affixed to the rear of the frame. The toroidal magnet has a central passageway that opens into the frame. A cap is affixed to the rear of the magnet and closes the central passageway. A guide rod is affixed to the cap and projects forwardly from the cap into the central passageway. A tubular former is slidably positioned upon the guide rod. A voice coil is wound about, and is affixed to, the tubular former. A driver plate is affixed to the front of the tubular former. A resilient surround connects the periphery of the driver plate to the front of the frame. A suspension assembly resiliently connects the tubular former to the frame and has a pair of conical diaphragms that are secured together so as to form a bellows. A spider connects the bellows to the frame and another spider connects the bellows to the tubular former.

Abstract: A speaker device includes a vibrating body including a diaphragm and a voice coil supported by a part of the diaphragm and a magnetic circuit including a first magnetic pole part having a magnet and a second magnetic pole part different from the first magnetic pole part and arranged spaced apart from the first magnetic pole part. The voice coil is arranged between the first magnetic pole part and the second magnetic pole part, the vibrating body includes a conducting part formed at a part or whole of the diaphragm, in the proximity of the voice coil, and the conducting part is arranged between the first magnetic pole part and the second magnetic pole part.

Abstract: The invention concerns a mobile communications unit (100) having at least one transducer (120) that can broadcast audio through a direct port (110), at least one leak port (114) for leak tolerance of the unit, in which the leak port can have a first opening (116) and a multi-use opening (118). The multi-use opening can be coupled to the first opening of the leak port to complete a path for the leak port, and the multi-use opening can also receive a part of an accessory. As an example, the mobile unit can be a monolith mobile unit. As another example, the accessory can be a holster having a hook mechanism that fits within the multi-use opening and can secure the mobile communications unit to the holster.

Abstract: A speaker assembly includes a speaker housing with a closed top wall, an opposed open end and first, second, third and fourth sidewalls extending downwardly from the closed top wall. The closed top wall is substantially planar and forms a support surface. First and second midrange drivers and first and second high frequency drivers are mounted within the housing, wherein the first midrange driver and the first tweeter are mirror images of second midrange driver and the second tweeter. A first support bracket supports the first midrange driver and first tweeter along a first side of the closed top wall adjacent the first sidewall of the speaker housing. The first support bracket includes a planar support surface which is obliquely oriented relative to a plane in which the closed top wall lies. A second support bracket supports the second midrange driver and the second tweeter along a second side of the closed top wall adjacent the third sidewall of the speaker housing.

Abstract: An object of the present invention is to provide a speaker system in which a woofer and a group of tweeters are substantially coaxially arranged, and sound waves emitted from the woofer and sound waves emitted from the tweeter are less likely to interfere with each other in at least one direction, and whose sound pressure frequency characteristics easily stabilize. A speaker system 4 according to the present invention includes a woofer 2 and three or more tweeters 3, and the tweeters 3 are arranged in front of the woofer 2 in a circular-arc formation.

Abstract: A transducer assembly includes a first electroacoustic transducer and a second electroacoustic transducer. The first and the second electrostatic transducers include an electrode and a counter electrode. An inner circumference of an outer diaphragm section lying within an outer circumference forms the counter electrode of the first electroacoustic transducer. An inner diaphragm section that lies within the inner circumference of the outer diaphragm section forms the counter electrode of the second electroacoustic transducer.

Abstract: A simple structure will achieve dissipation of heat from the area inside a voice-coil bobbin and a diaphragm without a reduction in sound quality, in which a process for assembling a speaker device with high accuracy is performed in a simple operation. A speaker device comprises a recess-shaped frame 5 which supports, through an edge 9, a vibration system member 68 provided with a diaphragm 8 coupled to a voice-coil bobbin 6, and a magnetic circuit 4 which comprises an approximately ring-shaped magnet 2 and an approximately ring-shaped plate 3 which are mounted on a yoke 1 disposed in the frame 5, and a magnet gap 4g in which a voice coil 7 wound on a voice-coil bobbin 6 is disposed. In the magnetic circuit 4 a through hole 45 extending in the vibration direction of the diaphragm is fitted over a center boss 51 of a shape protruding from the bottom of the frame 5 in the direction of the sound emission, so that the magnetic circuit 4 is positioned and fixed with respect to the frame 5.

Abstract: A coaxial loudspeaker including a tweeter unit and a low/midrange unit with a cone diaphragm suspended in a loudspeaker basket, which comprises an electromagnetic drive fixedly attached to a loudspeaker basket on its tapered end, in the area of which the tweeter unit is positioned, whose sound radiation surface is directed away from this drive. In one embodiment, in order to suppress the sound focusing of traditional coaxial loudspeakers with a woofer/midrange cone diaphragm, and to ensure a simple and cost-efficient assembly of the tweeter unit, the electromagnetic drive for the cone diaphragm of the woofer/midrange unit is located within the space bordering the convex curved exterior side of the cone diaphragm, and the tweeter unit is positioned outside of this space.

Abstract: A speaker system having a structure in which the room surrounding the first diaphragm and the room adjacent to the second diaphragm are acoustically coupled. The second diaphragm has coating on a surface. Applying the coating to the second diaphragm enhances the reliability and performance of the speaker system. Besides, the diversely definable geometry of the diaphragm allows an electronic device employing the speaker system or the speaker module to have flexibility in design.

Abstract: A diaphragm (1) of a light sound converter which has a high performance, is suitable for mass-production and has a slit (1s) formed therein. A light emitting element and a light receiving element are disposed at positions opposed to a reflective part (1a) of the diaphragm (1) having a pressure receiving surface part (1d) and the reflective part (1a), and light is radiated from the light emitting element to the reflective part (1a) of the diaphragm (1) and the reflected light from the reflective part (1a) is received by the light receiving element, whereby the position of the diaphragm (1) can be detected.

Abstract: A dual tweeter speaker, wherein the tweeters are spaced far apart, is provided. The loudspeaker system includes a woofer and two tweeters, which are arranged so they reduce interference with sound waves emitted by the woofer. The spaced apart tweeters provide an improved stereo imaging range. The tweeters can also use a low cross-over frequency, so that they can provide both midrange and high frequencies.

Abstract: A sound reproducing apparatus includes a display unit, a board 22, a diaphragm panel 23, and an electroacoustic transducer 26. The display unit displays an image on a display surface. The board 22 is composed of a material which transmits visible light and arranged such that a first space is provided between the display surface of the display unit and the board 22. The diaphragm panel 23 is composed of a material which transmits visible light and arranged on the opposite side of the board 22 from the display unit such that a second space is provided between the board 22 and the diaphragm panel 23. The electroacoustic transducer 26 emits sound into the second space.

Abstract: A coaxial speaker assembly (10) with reduced sound distortion, sound time delay, and polar response distortion. The coaxial speaker assembly (10) includes a high-frequency speaker system (16) mounted coaxially with and fitting within a lower-frequency speaker system (14). A baffle (50) is secured to a diaphragm (48) of the high-frequency speaker system (16). A step-down ledge (52) is circumferentially positioned adjacent to the baffle (50) and extends outwardly therefrom. A portion of the sound waves emanating from the high-frequency diaphragm (48) are reflected off the step-down ledge (52).

Abstract: A tweeter with a light, thin sandwich plate which can be excited into multiple reflected bending waves, and a driver which makes a vibrating contact and excites the sandwich plate, where the driver is designed for higher sound frequencies and the sandwich plate for propagating bending waves with low damping. The sandwich plate is freely carried with low damping by holding elements, where the latter are designed to be low damping at higher sound frequencies.