Abstract: The present invention is directed to an apparatus for reproducing the bass components of an audio signal with a high degree of accuracy and minimal distortion, utilizing an enclosure of relatively small size. The apparatus comprises a substantially sealed enclosure in combination with a radiating diaphragm driven by an electromagnetic transducer, the principal diaphragm restoring forces being the elastic forces exerted against the diaphragm surfaces by the gaseous medium engaging such surfaces.

Abstract: A speaker system comprises an enclosure and at least one speaker mounted therein. The enclosure includes at least one duct connecting the interior of the enclosure directly with the outer air at the front thereof. Each duct is confined at least at one side by a member extending substantially normal to and running substantially the width of the front of the enclosure. The member has its front and/or rear edge rounded so that the cross-sectional dimension of the opening of the duct at the respective edge is greater than that of the central section of the duct.

Abstract: An electroacoustic transducer assembly adapted to filter sound waves in a digital communication system incorporates a plurality of tandemly arranged tubular members and a transducer. Each tubular member includes an apertured plate end, a tubular cavity and an open end. The open end of each tubular member is secured to the plate end of the adjacent tubular member to form a housing with a divided longitudinal passageway. The open end of the housing is secured to the transducer. Every tubular cavity is partitioned into longitudinal sections by structural elements to inhibit cross mode resonance. The apertures, cavity lengths and structural elements are dimensioned relative to the cavity cross sections to suppress passage of sound waves outside a predetermined frequency band.

Abstract: A speaker system in which at least one driver is mounted on an enclosure and is adapted to radiate sound waves outwardly from said enclosure in response to an input signal. A sound absorbing material is disposed on at least a portion of the outer surface area of said enclosure to reduce the effect of diffractions and reflections of said sound waves relative to said enclosure.

Abstract: The loudspeaker is mounted within a hollow, essentially tubular body so that the loudspeaker structure extends into the tubular body. The tubular body is at least in part insertable into an opening of a vehicle panel, such as a dashboard, rear window shelf, or the like. The rear of the panel is closed off by a housing body, shaped to leave a space or chamber behind the tubular body; preferably, the housing body is made of a foam material, or includes, at the inside, a foam rubber material which may be of open pore structure at least in the region facing the tubular body.

Abstract: A loudspeaker device comprises a bass reflexing duct formed on an enclosure on which the loudspeaker unit is provided, a passive radiator provided on the enclosure; an acoustic impedance body provided between at least one of the duct and passive radiator and the loudspeaker unit, so that the resonance frequencies of the duct and the passive radiator are different from each other thereby to markedly improve the low acoustic compass characteristic thereof.

Abstract: A loudspeaker enclosure comprises a housing defining therein a principal volume having a front wall and a substantially smaller minor volume. The minor volume has a rear wall common to the front wall of the principal volume. The common wall defines a port which communicates the minor volume to the principal volume. A speaker mounting opening is defined in a front wall of the minor volume. The speaker mounting opening defines the only opening from the exterior of the housing to the interior thereof.

Abstract: A loudspeaker system for the passenger compartment of a vehicle, such as an automobile, is disclosed. The system has at least two loudspeakers arranged on opposite sides of the passenger compartment in the end regions of a rigid, hollow support element which is closed on all sides and extends across substantially the entire width of the passenger compartment. This hollow support element is at least partially filled with sound absorbing material.

Abstract: A loudspeaker having precise imaging, neutrality of frequency response, and controlled mid-range and tweeter dispersion. The loudspeaker incorporates an open cell, reticulated polyurethane cartridge for placement of a supertweeter mounted in the loudspeaker at an angle of 45.degree. from other speaker axes. The housing therefore may be positioned so as to adjust the high frequency acoustic radiation to the right or the left of the loudspeaker frontal axis, thus making a mirror image pair of the loudspeakers possible. In addition, angled corner posts are arranged at the front corners of the loudspeaker in order to reflect back into the loudspeaker mid-range and high frequency sounds that strike the posts.

Abstract: A compact loudspeaker system adapted for the reproduction of sound at minimum distortion. Two small diameter direct radiator loudspeakers and a matching crossover network are mounted in a common enclosure having a short non-folded transmission line completely filled with randomly oriented non-woven fibers, said fibers having a single installed density within range of 12 to 30 ounces per cubic foot. The first of these speakers, a bass/mid range unit is acoustically coupled to one end of the fiber filled transmission line by exposing the speaker radiator rear surface to the line while the second speaker, a high frequency unit, is acoustically isolated from the transmission line by encapsulating the speaker radiator rear surface in a housing integral with the second speaker. A port, located at the end of the transmission line, acoustically couples said line to the atmosphere.

Abstract: The rear cavity of a tweeter speaker includes a cylindrical block four of a rigid, open celled, homogenous foamed material, such as aluminum. The rear end of the cylinder is cut to expose open cells, and is coated with an impermeable resin film, whereby the block absorbs and dampens back-pressure vibrations within the speaker cabinet from the low frequency woofer, and reduces standing and reflected waves generated by the tweeter. Alternatively, the entire block may be enclosed within a case five.

Abstract: An acoustical speaker device adapted to be recessed in, for example, the ceiling of a room, has a paraboliform loudspeaker housing with an open end and an aperture formed at its concave end generally coaxial with the open end. A collar coaxially surrounds and extends outwardly of the housing from the concave end. An electrical transformer is removably located in the collar, and the collar is closed by a removable cap. A loudspeaker device is disposed within the housing proximate the open end of the housing and is oriented to radiate sound waves outwardly of the housing through the open end.

Abstract: The present invention is a device for use in combination with a loudspeaker system, that includes a speaker enclosure, in order to effectively enlarge the volume of the speaker enclosure. The loudspeaker system also includes a vibratable cone. The device for effectively enlarging the volume of the speaker enclosure includes a gas having a gamma less than 1.4 and the product of its density and the square of the speed of sound therein less than the same product for air and a bag which is formed from a soft, pliable material for enclosing the gas within the speaker enclosure and which is adapted to seal the gas therein. The device also includes an acoustically transparent and porous cocoon which is disposed about the bag so that it surrounds completely the bag and an acoustical padding which is disposed adjacent to the sidewalls of the speaker enclosure and which is adapted to enclose the acoustically transparent and porous cocoon.

Abstract: A loudspeaker device, wherein a speaker cabinet fitted with a speaker unit is filled with flexible gas-bearing material and fibrous cotton-like material. According to this invention, it is possible to increase the apparent inner volume of the cabinet, prevent the generation of a standing wave and reproduce sounds with a good quality.

Abstract: A loudspeaker of the well known conical diaphragm moving coil type is provided with an annular, frusto-conical, cellular damping/deflection element on the magnet or magnet housing thereof. This element interferes with the rearward radiation of sound from the diaphragm and is of particular value when the loudspeaker is housed in a cabinet since it acts to inhibit the formation of standing waves due to reflection at the rear wall of the cabinet of the rearwardly directed radiation; this reduces the distortion of the forwardly radiated sound, caused by the rearwardly directed radiation reflected from the rear wall of the cabinet. A further cellular element, of generally cylindrical form, may be attached to the rim of the diaphragm so as to project rearwardly therefrom and surround the loudspeaker back to a line defined by the forwardmost part of the frusto-conical annular cellular element on the magnet or magnet housing.

Abstract: A device for use in an enclosure associated with an audio speaker or other sound producing device and which permits relatively large volume changes within the enclosure as a result of relatively small pressure changes so that relatively small enclosures can be as effective as enclosures of larger volume. The device reduces the energy required from the speaker to change the volume of the interior of the enclosure. The device has a displaceable walled container having an expansible and contractible volume containing a composition of matter at gas phase/liquid phase equilibrium at its boiling point under atmospheric or other ambient pressure. The composition of matter preferably selected is one having the characteristic that relatively large volumes undergo a phase change for relatively small energies. The composition is heated to its boiling point. The heater is actuated by a volume responsive switch to maintain the container within a selected range of volume.

Abstract: Background sound system provides audiofrequency energy in a large office space for masking speech. The system includes a plurality of downwardly directed speakers in speaker enclosures mounted on the top of the suspended ceiling defining the office space. The speakers are thus directly acoustically coupled with the office space.

Abstract: An integrally formed cabinet for a loudspeaker having a preformed horn for dispersing acoustic energy with minimum distortion.

Abstract: An improved speaker enclosure for providing an acoustical balanced output with improved audio quality at low level reproduction. The enclosure includes a low sonic frequency pressure induced sonic wave amplification resulting from in phase reflection mechanically of re-induced resonant pressure waves. The invention comprises a speaker chamber of improved construction, the speaker being placed across one end, with the opposite end of the chamber being closed by an elastic diaphragm having an acoustic non-resonant tube centrally disposed protruding into the chamber, allowing the flow of air from inside the chamber enclosure to the outside atmosphere.