Abstract: A signal converter includes a chamber, a first diaphragm, a second diaphragm, and a first converter. The chamber has a first opening at one end and a second opening at a second end opposite the first end. The first diaphragm is disposed so as to cover the first opening. The second diaphragm is disposed so as to cover the second opening. The first converter is disposed in the chamber and configured to generate a first signal based on a vibration of the first diaphragm.

Abstract: A loudspeaker includes a housing, a driver module and a vibrator module. The housing has a first wall section, and a second wall section that is spaced apart from the first wall section in a first direction. The driver module is mounted to the housing and includes at least one driver cone. The vibrator module includes a pair of first vibrators that are disposed on the first wall section and that are respectively located at two opposite sides of the driver module in a second direction perpendicular to the first direction and a pair of second vibrators that are disposed on the second wall section and that are respectively located at two opposite sides of the driver module in the second direction.

Abstract: A headset includes a speaker, such as a side firing dipole speaker. The headset includes a front chamber that receives sound waves from a first side of the speaker and a rear chamber that receives sound waves from a second side of the speaker. A control leak channel connects the front chamber and the rear chamber. An acoustic mesh may be located within the control leak channel. The speaker configuration is configured to reduce total harmonic distortion of the speaker, particularly in ranges such as 3-6 kHz, while maintaining the broadband efficiency of the speaker.

Abstract: The invention provides a sounding device. The sounding device comprises a housing body with an accommodating space, a one-way inlet valve and a one-way outlet valve. A speaker unit partitions the accommodating space into a front cavity and a back cavity. The one-way inlet valve communicates the outside and the back cavity and is used for introducing air into the back cavity. The one-way outlet valve communicates the back cavity and the outside and is used for discharging the air in the back cavity outside. A first through hole communicating the outside and the back cavity is formed in the housing body. The invention also provides a mobile terminal. Compared with the related art, the sounding device and the mobile terminal of the invention have better reliability and better performance.

Abstract: The present invention relates to a hybrid movable coil plate and a flat panel speaker, and more particularly, to a hybrid movable coil plate and a flat panel speaker which have improved acoustic pressure of the speaker by attaching a coil pattern printed on one surface of the movable coil plate and a copper wire coil wound on the other surface to increase inductive electromotive force. A hybrid movable coil plate for a flat panel speaker is characterized by including a spirally wound copper wire coil attached on one surface thereof and a PCB coil pattern-printed on the other surface thereof, wherein the copper wire coil and the PCB coil are formed in track shapes, a pair of lead wire connection ends are formed, and copper foils are formed in one or more via holes for electrical connection between the copper wire coil and the PCB coil, and in the vicinity of at least one among the one or more via holes.

Abstract: A method and device for generating synthetic vortex sound field (SVSF) with more mode number includes the following steps: (1) a transducer array composed of N transducer units is constructed, and each transducer unit emits a sound field to generate an initial sound field; (2) at the same time, the position of the transducer unit and the phase of the sound field emitted by each transducer unit are changed, and each change produces a sound field, and thus changings times produces of sound fields, wherein the way to change the position of the transducer unit is to rotate the transducer array as a whole; (3) the initial sound field is superimposed with s of sound fields generated in step (2), to obtain SVSF with more mode number. The method and device for generating vortex sound field (VSF) can be used for underwater communication or acoustic imaging.

Abstract: A display module, a display device and a method of forming a display module are provided. The display module includes: a display sounding structure including a display panel and an auxiliary layer connected to the display panel; an excitation source configured to drive the display panel, the display module further includes a supporting frame, and the display panel is connected to the supporting frame through the auxiliary layer; or an excitation source configured to drive the auxiliary layer to vibrate and sound, the auxiliary layer is a transparent film layer arranged at a light-emitting side of the display panel cooperating with the display panel to form a sounding chamber in an enclosing manner.

Abstract: A piezoelectric actuator including an upper piezoelectric bimorph beam having a first upper piezoelectric layer, a second upper piezoelectric layer and at least three upper electrode layers extending between a first end and a second end of the upper piezoelectric bimorph beam; a lower piezoelectric bimorph beam having a first lower piezoelectric layer, a second lower piezoelectric layer and at least three lower electrode layers extending between a first end and a second end of the lower piezoelectric bimorph beam, and wherein the first end of the lower piezoelectric bimorph beam is coupled to the first end of the upper piezoelectric bimorph beam by a first joint, and the second end of the lower piezoelectric bimorph beam is coupled to second end of the upper piezoelectric bimorph beam; and a base member coupled to a center region of the lower piezoelectric bimorph beam.

Abstract: A head band; and a pair of earmuffs being respectively mounted on two ends of the head band, each of the earmuffs has a speaker and a cushion. The cushion has an annular elastic portion protruded from a peripheral of the cushion and a chamber is surrounded by the annular elastic portion. The speaker has a back housing. A circuit board mounted to the back housing. A connector mounted on the circuit board. A speaker unit mounted to the back housing. A front housing covers the speaker unit and is assembled with the back housing. An opening penetrated through the front housing. A pressure sensor is disposing in the opening. A flexible circuit board connected between the pressure sensor and the connector of the circuit board. The cushion attached to the front housing. The pressure sensor is located in the chamber.

Abstract: A panel audio loudspeaker includes a panel extending in a plane and an actuator coupled to the panel and configured to couple vibrations to the panel to cause the panel to emit audio waves. The actuator includes a rigid frame attached to a surface of the panel and the frame includes a portion extending perpendicular to the panel surface. The actuator also includes an elongate flexure attached at one end to the portion of the frame extending perpendicular to the panel surface, the flexure extending parallel to the plane and having a first width where the flexure is attached to the frame different from a second width where the flexure is unattached to the frame. The actuator further includes an electromechanical module attached to a portion of the flexure unattached to the frame, the electromechanical module being configured to displace an end of the flexure during operation of the actuator.

Abstract: An actuator, attached to a panel extending in a plane, includes a frame and a magnetic circuit assembly that includes a magnet and a voice coil, the magnet and voice coil being moveable relative to each other during operation of the actuator along an axis perpendicular to the panel's plane. The actuator further includes one or more suspension members attaching the frame to a first component of the magnetic circuit assembly. Each suspension member includes a segment attaching the suspension member to the frame at an attachment point and a first arm extending away from the attachment point to an end attached to the first component of the magnetic circuit assembly. During operation of the actuator the first arm of the one or more suspension members flex to accommodate axial displacements of the magnet relative to the voice coil.

Abstract: An omnidirectional loudspeaker box comprises a plurality of loudspeaker modules uniformly disposed in an annular configuration. Each loudspeaker module comprises one or more active vibration units and one or more passive vibration units. The one or more active vibration units are uniformly disposed in an annular configuration. The one or more passive vibration units are uniformly disposed in an annular configuration. The one or more active vibration units can respond to the input of external signals and drive the one or more passive vibration units to vibrate together, thereby generating improved sound quality and effect.

Abstract: A display apparatus includes a display panel configured to display an image, a supporting member on a rear surface of the display panel and configured to support the display panel, a sound generating device on the rear surface of the display panel and configured to vibrate the display panel to generate sound, and a connection part configured to connect the supporting member to the sound generating device. The sound generating device includes a plate spaced apart from the supporting member, a frame outside the plate, a magnet and a center pole on the plate, a bobbin around the center pole, and a coil outside the bobbin. The connection part is between the supporting member and the frame.

Abstract: A noise cancellation headphone comprises a speaker, a front plate for carrying the speaker, a microphone arranged on or in the front plate, and a front vent opening arranged within the front plate and in close proximity to the microphone. The microphone is usable as a feedback microphone for active noise cancellation.

Abstract: The present invention discloses a speaker, which includes a basket, a vibration system fixed to the basket, and a magnetic circuit system arranged in the basket. The vibration system includes a first diaphragm fixed to the basket and a second diaphragm oppositely separated from the first diaphragm, the magnetic circuit system includes an upper clamping plate fixed to the basket, and the upper clamping plate is disposed separately from the second diaphragm. The upper clamping plate includes a fixing portion fixed to the basket, the upper clamping plate is provided with a step recessed towards the first diaphragm from one side of the upper clamping plate facing away from the first diaphragm, and the step is connected with the fixing portion.

Abstract: A sound generator is provided by the present disclosure. The sound generator includes a frame; a magnetic circuit system fixed by the frame; and a vibration system carried by the frame. The vibration system includes a diaphragm and a voice coil fixed below the diaphragm for driving the diaphragm to vibrate. The voice coil includes a pair of parallel long axis edges, a pair of parallel short axis edges connected with ends of the long axis edges. The diaphragm includes a through hole formed corresponding to the long shaft edge of the voice coil, and a glue part filled in the through hole for connecting the long shaft edge of the voice coil with the diaphragm.

Abstract: A speaker and earplug earphones are provided. The speaker includes a cylindrical speaker housing. A partition board arranged along a radial direction is disposed in an enclosed cavity. A first speaker and a second speaker are respectively disposed on both sides of the partition board, and each includes a magnetic circuit system and a vibrating system. A magnetic gap is disposed between the magnetic circuit system and the speaker housing, and an air pressure balance holes are formed in the partition board located at the magnetic gap. The vibrating system includes a voice coil and a vibrating diaphragm covering the end part of the speaker housing. Each earplug earphone includes an earphone front housing and an earphone back housing. The speaker is mounted in the enclosed space. Multiple front housing sound output holes is formed in the earphone front housing. An acoustic waterproof membrane is disposed between the multiple front housing sound output holes and the speaker.

Abstract: Embodiments provide a compensator for a loudspeaker system having a first loudspeaker group having at least one sound transducer, the first loudspeaker group being configured to generate a first sound signal based on an audio signal, the sound signal having a useful signal portion and a distortion signal portion. The compensator has a second loudspeaker group having at least one sound transducer, the second loudspeaker group being configured to generate a second sound signal based on a compensation signal, the second sound signal compensating and/or reducing the distortion signal portion when superimposed with the first sound signal.

Abstract: A speaker device includes a housing that has a sound guide space having a vertically flattened shape, a first speaker disposed in the housing to be oriented toward a front of the housing, and a second speaker that is disposed in the housing and is oriented upward or downward to output sound into the sound guide space positioned at an internal upper part or an internal lower part of the housing. The sound guide space opens at an opening that is formed in vertically flattened form in the housing, and the opening has a vertical height that is smaller than an aperture of the first speaker.

Abstract: An improved loudspeaker is disclosed. The speaker includes at least one permanent magnet, an electromagnet and a diaphragm. The diaphragm has an inner portion (active portion) and an outer portion (stabilizing portion) that are both typically ring-shaped. The interaction between the magnets causes the inner portion to move back and forth according to the electrical signal inputted. As the inner portion moves forward, the outer portion tends to move backward relative to the inner portion. The movement of the active portion tends to produce corresponding forces on the stabilizing portion that cause the stabilizing portion to move and create sound in a symbiotic fashion. In certain embodiments, the portions move relative to each other as sound is produced so that a relatively constant volume of air is displaced on either side of the diaphragm thus minimizing acoustic distortion.

Abstract: An acoustic device includes first and second acoustic cavities which are air tight. A first passive radiator includes a first passive radiator diaphragm that has a rear surface which is exposed to the first acoustic cavity. A second passive radiator includes a first passive radiator diaphragm having a front surface which is exposed to the first acoustic cavity, and a rear surface which is exposed to the second acoustic cavity. A first electro-acoustic transducer is supported on the second passive radiator diaphragm. The first electro-acoustic transducer is arranged such that a first radiating surface of the first electro-acoustic transducer radiates acoustic energy into the first acoustic chamber and a second radiating surface of the first electro-acoustic transducer radiates acoustic energy into the second acoustic chamber.

Abstract: An electrodynamic acoustic transducer (1a . . . 1c) is presented, which comprises a housing (2), a membrane (3), a coil arrangement (6a . . . 6f) attached to the membrane (3) and a magnet system (9, 10, 11). The coil arrangement (6a . . . 6f) comprises a plurality of coils (7, 8) each having two terminals (T7, T8, T7a, T8a, T7b, T8b, T78) being static in relation to the housing (2). At least one pair of coils (7, 8) has one terminal (T78) in common, whereas the remaining terminals (T7, T8, T7a, T8a, T7b, T8b) are individual terminals (T7, T8, T7a, T8a, T7b, T8b). Connecting wires (12, 13, 12a, 13a, 12b, 13b) connect the coils (7, 8) with the individual terminals (T7, T8, T7a, T8a, T7b, T8b), and a conductive layer or path (14a . . . 14g) attached to the membrane (3) electrically connects the coils (7, 8) with the common terminal (T78).

Abstract: A voice coil former including a first portion having a planar region and an out-of plane region that extends outside a plane of the planar region, and wherein a length dimension of the first portion is at least two times greater than a width dimension of the first portion. The former further including a second portion extending from the first portion in a direction perpendicular to the plane of the first portion, the second portion being integrally formed with the first portion and dimensioned to support a voice coil thereon.

Abstract: An earphone structure is provided, relating to the technical field of earphones. The earphone structure includes: a speaker, including a sound producing vibrating diaphragm and a sound outlet, wherein the sound producing vibrating diaphragm is used to convert an electrical signal to a sound which is output through the sound outlet; a pipe, wherein the pipe has one end provided at a side of the speaker having the sound outlet, and the other end extending along a direction away from the sound outlet, such that the sound output from the sound outlet is transmitted to an outside space. With the above provision, a problem of easy occurrence of reflection of sound waves within a cavity due to presence of the cavity between the pipe and the sound outlet in the prior art, thereby overcoming a problem of sound coloration caused by the occurrence of reflection of the sound waves.

Abstract: A thin speaker with a voice coil having a damper function, includes a frame, a magnetic device, a damper voice coil and a diaphragm. The damper voice coil comprises a holding member and a conductive member. The holding member includes a holding base and two holding suspension portions formed on two ends of the holding base. The conductive member includes a conductor wound to form a first winding at one side of the holding base and a second winding at the other side of the holding base, and two conductive suspension portions formed on two ends of the conductor and located on the top of holding suspension portions. Since the damper voice coil has the functions of a damper and a voice coil, the present invention is capable of maintaining a thin design and ensuring the up and down movements of the holding base to prevent its deflection.

Abstract: A display device includes a display module displaying an image, a vibration generating device including at least one sound generating module vibrating the display module, a rear structure disposed on a rear surface of the display module to fix the vibration generating device, and a vibration transfer member disposed between the at least one sound generating module and the display module to extend from the at least one sound generating module to an edge of the display module. Accordingly, a sound pressure level corresponding to a high frequency domain is prevented from being reduced, thereby enhancing the quality of a sound output to a region in front of a display panel.

Abstract: A stabilizer for use in stabilizing a diaphragm of an audio device, such as a microphone transducer or a speaker driver. The stabilizer is configured to be attached to the diaphragm to provide stability to the diaphragm, which may be in the form of one or more of counteraction to asymmetric movement about the center of mass of the voice coil; counteraction to rotation in a direction perpendicular to the desired axial motion of the diaphragm; and additional nonlinear stiffness for mechanical limiting of the diaphragm in the axial direction, which may assist in preventing large excursions of the diaphragm from atypical sources, such as drop, shock, etc.

Abstract: An acoustic device includes first and second acoustic cavities which are air tight. A first passive radiator includes a first passive radiator diaphragm that has a rear surface which is exposed to the first acoustic cavity. A second passive radiator includes a first passive radiator diaphragm having a front surface which is exposed to the first acoustic cavity, and a rear surface which is exposed to the second acoustic cavity. A first electro-acoustic transducer is supported on the second passive radiator diaphragm. The first electro-acoustic transducer is arranged such that a first radiating surface of the first electro-acoustic transducer radiates acoustic energy into the first acoustic chamber and a second radiating surface of the first electro-acoustic transducer radiates acoustic energy into the second acoustic chamber.

Abstract: [Problem] To provide a universal speaker that efficiently transmits kinetic energy that has been converted from electrical energy of an audio signal to one or more diaphragms, and enables both healthy individuals and the hard of hearing to comfortably hear as a result of higher-volume and sharp emitted-sound. [Solution] This universal speaker (10) is provided at least with a diaphragm (1) having a planar shape, a driver unit (2) for causing the diaphragm to vibrate in accordance with an inputted electrical signal, and an enclosure (3) with a hollow structure for accommodating the diaphragm and the driver unit. The enclosure has an opening (39) at one surface, and the driver unit abuts against an end edge of the diaphragm so as to drive in the same direction as the plane direction of the diaphragm and is also fixedly mounted onto the enclosure.

Abstract: A method and apparatus for carrying a portable communication device. The portable communication device includes a housing, a screen supported by the housing, and a speaker supported by the housing. A carrier releasably supports the portable communication device. The carrier includes a body having a first end, a second end opposite the first end, and a surface extending between the first and second ends. The screen of the portable communication device faces the surface of the body. The surface is spaced apart from me screen to form an acoustic tunnel between the screen and the surface. The speaker of the portable communication device directs sound into the acoustic tunnel.

Abstract: A acoustic device includes a supra-aural ear cup, a pinna replica at least partially enclosed by the supra-aural ear cup, wherein an inner surface of the pinna replica faces the exterior so that exterior sounds are received by the pinna replica and a microphone unit for collecting said exterior sounds, said microphone unit being configured to emit a first electric signal comprising information on the collected exterior sounds.

Abstract: An electroacoustic transducer is provided and includes: a diaphragm having a pair of longitudinal split tubular surfaces arranged next to each other, a valley being formed between respective side portions of the pair of longitudinal split tubular surfaces; a converter including a magnet mechanism and a voice coil configured to perform conversion between vibration of the diaphragm along a depth direction of the valley and an electric signal corresponding to the vibration; and a supporter that supports the diaphragm such that the diaphragm is vibratable along the depth direction of the valley. A tubular portion is provided at an intermediate portion of the valley to couple the diaphragm and the voice coil to each other, and the tubular portion extends in the depth direction of the valley.

Abstract: In an example, a loudspeaker system includes a low frequency first transducer and an array of high frequency transducers overlapping a front face of the low frequency transducer. In an example, the transducer array has an arcuate profile, and an axis of the array is non-coaxial with a central axis of the first transducer.

Abstract: A speaker frame, including: a vibration support portion supporting a vibrating body of a speaker; a magnet support portion arranged inside of said vibration support portion and supporting magnetic circuit portion of said speaker; and a plurality of connection beams connecting said vibration support portion and said magnet support portion, wherein the vibration support portion and the magnet support portion have a circular ring shape having the same major axis length and minor axis length, said plurality of connection beams are arranged radially centering on a central axis from said magnet support portion to said vibration support portion, the central axis being parallel to a direction of an acoustic radiation, and a length of one of said connection beams and a length of another connection beams are different from each other.

Abstract: A media system 100 for vehicle 102 having chassis 104 comprises electroacoustic transducer 114, integrated into face panel 108 of stowage bin 110 inside vehicle 102. Stowage bin 110 comprises mounting structure 112 that is stationary relative to chassis 104 of vehicle 102. Interior 130 of stowage bin 110 is accessible via face panel 108. Face panel 108 is movably coupled to mounting structure 112.

Abstract: An electronic apparatus 1 having a panel 10, a housing 60 for supporting the panel 10, and a piezoelectric element unit 30 attached to the panel 10, the panel 10 becomes bent by the piezoelectric element unit 30 in such a manner that a region of the panel 10 immediately above the piezoelectric element unit 30 in a longitudinal direction thereof is raised higher than a surrounding region, and thus a part of the human body in contact with the panel 10 vibrates and delivers a sound, wherein the panel 10 is attached to the housing 60 by a double-sided adhesive tape 70 provided along a periphery of the panel 10 and an adhesive 71 applied along the double-sided adhesive tape 70.

Abstract: The present invention discloses a high frequency transducer housing for use in a coaxial loudspeaker system to reduce diffraction. The coaxial loudspeaker system comprises at least one high frequency transducer that is arranged to be mounted with a second frequency transducer. The housing comprises a plurality of edges on a periphery of the housing. The edges of the housing have irregular shapes. The plurality of the edges are eccentric with a diaphragm of the second transducer.

Abstract: A speaker unit includes a magnet having poles and generating magnetic flux, and a yoke part forming a path of the magnetic flux and including a first yoke extending from one of the poles, a second yoke extending from another one of the poles, and magnetic gaps disposed between the first yoke and the second yoke. The speaker unit further includes a voice coil disposed between the magnetic gaps and moving when applied with an electric current, and a diaphragm generating sound pressure while vibrating according to the movement of the voice coil. The first yoke includes magnetic plates protruding toward the second yoke, and the magnetic plates have thicknesses different from each other.

Abstract: A dual-frequency coaxial headphone including a headphone housing, a low-frequency speaker unit, and a high-frequency speaker unit. The headphone housing includes an accommodating space and a sound output hole. The accommodating space is communicated with the sound output hole. The low-frequency speaker unit is positioned in the accommodating space. The low-frequency speaker unit includes a housing and a low-frequency diaphragm disposed on the housing. The low-frequency diaphragm faces toward the sound output hole and includes a central through hole and an annular vibrating portion around the central through hole. The low-frequency diaphragm produces low-frequency sound waves toward the sound output hole by vibrations of the annular vibrating portion. The high-frequency speaker unit is disposed on the housing and is positioned in the central through hole. The high-frequency speaker unit is coaxial to the central through hole.

Abstract: A user terminal apparatus is provided. The user terminal apparatus includes: a flexible display including: a main area; and a sub area comprising a curved portion and extending from the main area to a side portion of the user terminal apparatus; a housing configured to enclose the flexible display; a sound output hole provided between the flexible display and the housing and configured to output a sound from a call function; and a sound input hole configured to receive an input sound.

Abstract: Provided is a high frequency oscillating ventilator comprising a housing assembly, a linear actuator, a linear coil, a piston mounted on a pushrod, a diaphragm dividing a housing into a first and second side and having an opening formed on the second side that is fluidly connected to the patient's airway for delivering gas thereto. The linear actuator is fixedly mounted to the housing assembly and has a linear coil coaxially disposed therewithin. A pushrod supports the linear coil on the linear actuator to allow relative axially sliding therebetween. The piston is directly mounted to the diaphragm such that reciprocation thereof as effectuated by the linear coil cooperating with the linear actuator alternately produces positive and negative pressure waves in the gas in the patient's airway.

Abstract: An electronic apparatus that may reduce sound leakage from a housing and the like vibrated by a vibrator and echo caused by the sound leakage is provided. An electronic apparatus includes a panel, a panel retainer for supporting the panel, and an element for vibrating the panel and thereby generating a vibration sound to be delivered via a human body, wherein a region of the panel near a disposing position of the element is thinner in a normal direction of the panel than a remaining region of the panel.

Abstract: Disclosed herein are multiple embodiments of a vibration transducer and actuator which combine an upper piece, a lower piece, a permanent magnet, an electromagnet coil, and, in some embodiments, a spring spacer.

Abstract: A speaker device includes a diaphragm, a frame supporting the diaphragm vibratably along a vibration direction, and a driving part disposed in proximity of the frame and vibrating the diaphragm corresponding to an audio signal. The driving part includes a magnetic circuit having a magnetic gap formed along a direction different from the vibration direction of the diaphragm, a voice coil supporting part having a voice coil and vibrating along the magnetic gap, and a vibration-direction-conversion part direction-converting the vibration of the voice coil supporting part and transmitting the vibration to the diaphragm. The vibration-direction-conversion part includes a link body angle-converting a link part formed between the voice coil supporting part and the diaphragm.

Abstract: The present invention relates to a hearing device comprising a microphone (1) wherein the microphone (1) comprises a first opening (8), a second opening (9) and at least three compartments (2, 3, 4), a first membrane (6) being arranged between the first and the second compartment (2; 3) and a second membrane (7;) at least partly covering the third compartment (4), wherein the second and the third compartments (3, 4) are connected in communicative manner via a canal (11).

Abstract: A disclosed multi-ring coaxial audio speaker may include a treble sound unit, a first bass sound unit co-axially surrounding the treble sound unit, and a second bass sound unit co-axially surrounding the first bass sound unit. The first bass sound unit, the second bass sound unit, and the treble sound unit may be co-axially disposed with respect to each other. Bass vibration audio source points and a treble vibration audio source point may be at the same horizontal level, to achieve the broader electrical adjustability. The size of the audio speaker may be reduced as well.

Abstract: A diaphragm is disclosed in the present disclosure. The diaphragm includes a middle layer, a first and a second adhesive layer attached on two side surfaces of the middle layer respectively, and a first layer adhered to the middle layer by the first adhesive layer and a second layer adhered to the middle layer by the second adhesive layer. The first adhesive layer is made of acrylic adhesive and the second adhesive layer is made of silica gel. A speaker using the diaphragm described above is also disclosed. The diaphragm can be used in a relatively wide temperature range and has a strong adaptability to the environment.

Abstract: A coaxial loudspeaker includes a permanent magnet positioned between a generally coaxially aligned first transducer having an associated permanent magnet and second transducer having an associated permanent magnet. In one embodiment, a magnetic cylinder is positioned between a woofer and a tweeter of a coaxial multi-way loudspeaker. An optional support structure, such as a plastic cylinder, may encompass the permanent magnet to enhance structural characteristics of the assembly. The woofer may include an external ceramic magnet extending around a center pole of the woofer.

Abstract: An annular diaphragm compression driver for electro-acoustic conversion has an annular diaphragm, which bears a moving coil, and a compression driver housing with a closed housing base. Opposite the housing base is a sound wave routing element having a sound discharge channel. The compression driver also has an annular magnet system unit, which has an annular magnet gap (M) and a compression chamber, adjoining the magnet gap (M), for the annular diaphragm. The open exit end of the sound discharge channel is in slot form and its entry start is annular. The sound path between the compression chamber and the entry start contains an annular collecting space. The collecting space and the sound discharge channel contain a central sound guidance body having a portion which merges to match the slot-like exit end. The sound discharge channel is formed between the sound guidance body and the sound wave routing element.

Abstract: A speaker includes a housing and four substantially similar electro-acoustic drivers secured inside the housing. The drivers are driven by substantially the same audio signal and are arranged such that the net mechanical vibrational force between the drivers and the housing is substantially zero. Four substantially similar passive radiators are secured inside the housing and driven by acoustic energy from the four drivers. The passive radiators are arranged such that the net mechanical vibrational force between the passive radiators and the housing is substantially zero.