Abstract: An audio speaker is incorporated in a ventilation register having a front grill through which sound generated by the audio speaker is projected, and a back plate to which the audio speaker is secured, spaced apart from the front grill by side plates to form an enclosure adapted to be received in registration with the ventilation duct. The back plate includes at least one and preferably a plurality of ventilation slots offset from and surrounding the audio speaker for communicating an air flow between the front grill and the back plate of the speaker arrangement, thereby allowing for the unimpeded operation of the ventilation system. So as to provide thermal protection for sensitive components of the audio speaker, thermal barrier is installed over the rearward extending speaker components to thermally isolate those components from conditioned, heated and cooled air either being flowed into or out of the room.

Abstract: According to the invention, a bass reproduction device is disclosed, with which the sound emission from the membrane (15) to the listening space (38) is carried out solely by way of a displacement volume (37) and at least one sound guidance conduit (34), whose cross section is smaller than the cross section of the membrane (15). A device of this kind has the advantage that for sound emission, only wall surfaces have to be supplied, which merely have to contain the sound guidance conduit(s) (34). The side of the membrane (15) remote from the displacement volume (37) acts on a closed damping volume (30), which can, however, be changed in its size over a great band width. A particularly favorable bass reproduction is achieved if the length of the respective sound guidance conduit (34)≦&lgr;/8 of the desired upper cross-over frequency.

Abstract: The television having a device for preventing vibration of speaker comprises a speaker. The speaker is fixed on one wall toward a hollow portion formed in an enclosure, and an opening for emitting sound is formed on the enclosure. A vibration plate faces the speaker to be positioned in the opening at a predetermined interval from the speaker. And, a mounting means for mounting the vibration plate on the enclosure is provided. Therefore, vibration of speaker emitting medium/low bandwidth sound outside and vibration of cabinet in which the speaker is mounted is minimized so that quality of sound becomes high and sound having high power is emitted outside.

Abstract: A mechanical mounting system and extensional damping technique for loudspeaker crossover networks. This system decouples the crossover network from the loudspeaker enclosure (cabinet), isolating it from any vibrational energy in the cabinet walls. In addition, an extensional damping material is applied to the crossover network to damp any vibrational energy which may be coupled from the surrounding air into the network. The mounting system can be used for mounting any sensitive electronic components within an enclosure to provide isolation from the walls of the enclosure and from surrounding or environmentally induced vibrational energy.

Abstract: A bandpass loudspeaker enclosure system including a first primary enclosure volume, a second primary enclosure volume and a dividing wall positioned between the first and second primary enclosure volumes and having a first opening therein. At least one electro-acoustic transducer is mounted at the opening on the dividing wall and includes a movable diaphragm having a first surface area side and a second surface area side. The first surface area side communicates into the first primary enclosure volume and the second surface area side of the movable diaphragm communicates into the second primary enclosure volume. At least one differential area passive radiator is provided, including (i) a primary diaphragm surface area having a primary peripheral attachment surround, and (ii) secondary diaphragm surface area having at least a secondary peripheral attachment surround.

Abstract: An apparatus (1) is constructed for operation in an on-ear mode and an off-ear mode and includes a housing wall (6) having passages (15) to allow useful sound waves to pass through, and additional passages (16) to allow the passage of sound waves which are in phase opposition to the useful sound waves and includes, behind the housing wall (6), an electroacoustic transducer (7) having a diaphragm (12), the transducer (7) being accommodated in an acoustically substantially impervious holder compartment (17). Sound-pressure frequency response influencing structures (18, 19) are arranged both in the sound path between the frontside (13) of the diaphragm (12) and the passages (15), and in the sound path between the rearside (14) of the diaphragm (12) and the additional passages (16).

Abstract: A boundary layer microphone is disclosed. Boundary layer microphones have been known for some considerable time. One example is the MKE 212 P microphone type made by Sennheiser electronic GmbH & Co. KG. The latter is a permanently polarized condenser microphone for concealed mounting in a wall, on the floor or on a table. Stereo recordings using such a boundary layer microphone are especially clear, creating a spatial impression of unusual breadth. The known boundary layer microphone MKE 212 P displays omnidirectional characteristics and a frequency range of 20 to 20,000 Hz. The disclosed boundary layer microphone is designed to increase the directional characteristics compared to a boundary layer microphone of the aforementioned type, and to reduce or eliminate the problems associated with same. This is achieved by a boundary layer microphone having at least one sound tunnel running underneath the plate surface, the plate having at least one opening to the sound tunnel.

Abstract: In a speaker system employing a bass reflex or Kelton type cabinet intends to solve deterioration in efficiency of a speaker caused by an increase in impedance otherwise occurring on both sides of the antiresonance frequency, and to improve the sound radiating efficiency. The speaker system comprises a plurality of dual-voice-coil speaker units (20) which are attached to a bass reflex or Kelton type cabinet (50) and made up of first voice coils (21) connected in parallel to each other with the same polarities joined into one terminal and second voice coils (22) connected in parallel to each other with their same polarities joined into one terminal, and one impedance compensation circuit (10) connected in series to the plurality of second voice coils, which are connected in parallel to each other, for thereby keeping constant the input impedance as a parameter of the speaker system.

Abstract: A speaker cabinet apparatus comprising an arc-shaped concave straight groove respectively on two sides of a face plate with one or two speakers combined, or an arc-shaped concave ring groove around the speaker, or a combination of groove structures a means for lighting.

Abstract: The latest advances in speaker driver design have resulted in high output drivers with superior low frequency response, power handling, and linear excursion than conventional drivers. These new drivers present further problems to enclosure design due to large port surface area and long port length requirements. The present invention wraps a port completely around an enclosure, maximizing port surface area and placing the consequently lengthy port in a more practical position. The port of the present invention converts a circular cross-section to an annular cross-section with constant cross-sectional surface area, thus integrating a large port into an enclosure without a large dimensional increase. In one embodiment, a bandpass configuration demonstrated a reduction in port air displacement and noise. Response deviations in the present invention due to flaws in construction and open pipe resonance can be alleviated through the use of plastics and filters, respectively.

Abstract: A speaker system having increased sound quality comprising a first and second speakers each having a front and back. The first and second speakers cooperate with a duct having a first elongated portion in fluid communication with the rear of the first speaker and a second elongated portion in fluid communication with the rear of the second speaker. The duct has an elongated bass port defined therein intermediate the first and second portions. Each of the speakers have their fronts in contact with the air outside of the duct and the backs of the speakers are in contact with the air inside the duct. The duct may have a first spur intermediate the first and second speakers with a bass port in the first spur. The duct may have a second and third spur at the axial extremities with the first and second speakers respectively engaging the second and third spurs. Each spur may have an axis and the axes of the spurs may be generally coplanar for automobile use.

Abstract: A speaker has a substantially reduced overall size while producing a complete low frequency sound range at high output amplitude. The speaker includes a main body having open sections at both ends thereof. A sounding body pinched by ringed first dampers is secured to each of the open sections of the main body so that the inside of the main body is kept air-tight. A first opening is provided at the middle part of the side of the main body. Lid members are secured on the outside of the two sounding bodies via a ringed second damper so as to keep the inside of the lid member air-tight. A second opening is created around the middle of the bottom of each of the lid members. A disc-like membrane is secured to the second dampers such that the lid members cover the membranes and cover the open section of the main body to keep the inside of the lid members air-tight.

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: A speaker system excellent in reproduction in bass range, which comprises a reinforcing post 3a to abut against the back side of a speaker unit 5 installed in a front cabinet 2. The reinforcing post 3a is formed integrally in a back cabinet 3, and is fixed with a cover 4. In this constitution, unwanted vibrations generated in the back cabinet 3, cover 4, and speaker unit 5 due to rear release wave b can be suppressed.

Abstract: A microphone housing system is disclosed having a tapered structure enclosed within the housing structure coupled to a rear portion of a microphone element. In the preferred embodiment, the tapered portion has a generally conic shape expanding away from the rear portion of the microphone element. The housing structure surrounding the tapered structure has a plurality of radially disposed opening or slots and fully or partially covered with a sound-resistive material. The housing system provides increased front-to-back signal ratio and increased overall gain and frequency response due to superior rear signal cancellation.

Abstract: In an electroacoustic transducer (1) having a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) in the area of the rear volume (HV) and cooperating with a magnet system (9), and including a substantially annular closing member (30) for closing the rear volume (HV), the closing member (30) has an annular body (38) and a ring projection (39), which projects obliquely from the annular body (38) along its entire circumference and is movable against spring action, at least one passage (34, 35, 36, 37) of the closing member (30), this passage having been provided in order to realize an acoustic friction between the rear volume (HV) and the acoustic free space surrounding the transducer (1), terminating in the annular contact surface (32) of the annular body (38), this annular contact surface extending transversely to the transducer axis (2).

Abstract: A speaker system comprises an acoustic tube with one end coupled to the back side of the speaker unit and the other end released to a sound field space through an opening window, and at least one air chamber disposed along the acoustic tube. The cross sectional area of the air chamber is larger than the cross sectional area of the acoustic tube, and the cross sectional area of the opening window is smaller than the cross sectional area of the acoustic tube. Therefore, the air chamber forms an acoustic filter so that the higher resonance frequency components in medium and high frequency region caused in the acoustic tube may not be radiated from the opening window, and formation of peaks and bottoms of frequency characteristic due to interference with the sound radiated from the front side of the speaker is prevented. The opening window of a small cross sectional area lowers the resonance frequency of the acoustic tube.

Abstract: A band pass speaker which can project tight clean bass with high quality sound, which is a speaker having a specially designed speaker box, including a first housing and a second housing. The first housing has a predetermined access opening on a front side and has an all around inner wall which provides an inner chamber with the predetermined access opening on the front side, at a back portion surface of the all around inner wall has a curvature, whereby the predetermined access opening is for receiving a second housing. The second housing has at least one sound generating unit mounted on a front side pointing forwardly, in which the second housing having an all around concealed inner wall providing a predetermined inner chamber, whereby at a front side edge of the front side of the second housing is for engaging into the access opening of the first housing leaving a predetermined output opening therebetween.

Abstract: A loudspeaker system includes an upper frequency assembly that radiates acoustical energy having spectral components in the audio frequency range above a predetermined upper frequency, typically at the high end of the bass frequency range between 150 and 200 Hz. The assembly includes a ported enclosure with a front face enclosing a loudspeaker driver with a cone adjacent to the front face of diameter slightly less than at least one of the height and width of the enclosure.

Abstract: Electroacoustical apparatus includes according to one aspect structure for providing a sound field concentrated at a restricted listening region corresponding substantially to a human head while being spaced from the restricted listening region. According to another aspect an electroacoustical transducer is located at the interface of an acoustic waveguide and a ported enclosure.

Abstract: In a thin foldable telephone or similar portable telephone, a speaker is mounted on an exclusive speaker casing mounted on the body casing of the telephone. The speaker casing is automatically protruded from the body casing when the telephone is used, or retracted into the body casing when the telephone is not used.

Abstract: A bass reflex-type loudspeaker having enhanced low frequency response and enhanced power handling capacity comprises a low frequency loudspeaker mounted in a ported enclosure whose walls are made purposefully resonant, the front baffle and rear surface of the enclosure connected by a sound post which serves to acoustically couple the front and rear enclosure surfaces.

Abstract: A cylindrical frame is mounted in a cabinet and a magnetic circuit is provided at an end of the frame. A diaphragm having a peripheral free edge is connected to a coil bobbin and a cylindrical ring is secured to the free end edge and disposed in a cylindrical supporting portion of the frame. An annular sealing member is secured to the cylindrical ring so that an outside peripheral wall thereof is slidably contacted with an inside wall of the cylindrical supporting portion of the frame.

Abstract: The present invention provides an electroacoustic transducer and a method of fabricating the same, employing a lead frame to integrally form a plurality of component parts, thus reducing the number of individual component parts, and improving assembly efficiency. The electroacoustic transducer comprises a base, a yoke fixed to the base, a core, a coil wound around the core, magnet surrounding the coil, a support ring surround the magnet, a vibrating plate supported on the support ring, lead terminals fixed to the base, and a case having a sound emitting cylinder and joined to the base so as to cover those components. A gap is formed between the core and the diaphragm. The diaphragm, the gap, the core, the yoke and the magnet form a closed magnetic path. The coil drives the diaphragm for vibration when energized. The yoke and the lead terminals are integrally formed of a common metal material such as the lead frame. The core may be integrally formed with the yoke of the lead frame.