Abstract: An enclosure for transducers incorporates an interior acoustically reflective shell. This acoustically reflective shell is shaped so that the inner surface thereof is the envelope of at least a section of a cylinder of elliptical cross section, an ellipsoid of revolution, or the envelope of a multitude of said shapes oriented so that the elliptical shapes share one common focus and each has one distinct focus. In this last case, transducers are placed at the distinct foci so that sound produced by them is directed substantially toward that portion of the elliptical acoustically reflective shell to which the distinct foci belong. In operation sound generated by the transducers, operating in phase with one another, is focused and concentrated at the common focus such that this common focus acts as a singular source of phase coherent sound of any desired angular beamwidth and intensity.

Abstract: A bass-reflex type speaker system having a cabinet including a front baffle board, a back panel and two side panels and a speaker mounted on the front panel. A port is disposed in either the back panel or in one of the side panels and a duct is in communication with the port. The back panel may be flat or have a generally triangular cross-sectional configuration where the apex of the triangle is directed toward the speaker. Further, the speaker may be positioned in the approximate center of the front baffle board and the port positioned at the apex of the back panel. A beam may be provided extending across and spaced from the port, the beam having a triangular shaped tip directed toward and spaced from the port.

Abstract: The upper peak impedance of a speaker or woofer that is mounted in a base reflex or ported enclosure is dampened by designing the enclosure so that the speaker is mounted in the upper end of a horn formed in the housing, for example, by inclining its front wall to the vertical, so that its upper edge is located closer to the rear wall of the housing than its lower edge. The interior of the housing between the speaker and the housing port thus has a cross sectional area which increases progressively from the upper to the lower end of the housing, and thereby functions as an acoustical transformer, which dampens the cone of the speaker particularly in the area of its upper resonant frequency.

Abstract: A free standing frame supports front, back, side, top and bottom panels in such a manner that the panels are free to move relative to each other. Speaker drivers are mounted to the front panel such that frontwave radiation therefrom is allowed to project outwardly. Rear wave radiation is, however, contained within the enclosure formed by the panels. Deflection of the panels as a result of impinging backwave energy dissipates the backwave without producing "ringing" or other resonant effects.

Abstract: A loudspeaker cabinet comprising front, back, top, bottom and side panels, a speaker drive unit positioned on an upper portion of the front panel, first and second spaced apart sound wave reflector panels positioned below the speaker unit and extending from the front panel towards the rear panel but not engaging the rear panel, a first sound wave pressure relief area defined by the rear panel and the end of the first reflector panel adjacent the rear panel, a second sound wave pressure relief area defined by the rear panel and the end of the second reflector panel adjacent the rear panel, and a third sound wave pressure relief area constituted by a relief aperture which is positioned below the second reflector panel and in the front panel, the loudspeaker cabinet being such that the first and the second reflector panels divide the interior of the loudspeaker cabinet into first, second and third compartments with the speaker drive unit being positioned in the first compartment whereby sound waves from the spea

Abstract: An improved speaker enclosure apparatus re-radiates biphase sound emanating from a speaker supported therein. When connected to receive a differential sound signal, the sound produced complements the direct sound radiating from "right" and "left" speakers. The enclosure is of compliant material, such that at low frequencies the entire enclosure expands and contracts with the expansion and contraction of the speaker diaphragm, responsive to volume expansion and contraction of the air enclosed in the enclosure. At high frequencies, only thinned portions of the enclosure expand and contract, responsive to the higher frequency sound wavefronts emanating from the speaker. The ability to mold the enclosure and the thinned portions provides a method of controlling the radiated wavefront to a desired shape to be propagated into the listening environment.

Abstract: Both an improved loudspeaker enclosure and an improved acoustical process for generating sound radiation in a room is herein disclosed. Basically, the walls of the improved enclosure include a loudspeaker, and a sound transmission port for transmitting sound generated by the back of the loudspeaker cone into the room. The interior of the enclosure includes a tuned acoustical chamber for absorbing the even and odd harmonics of the system resonance frequency, and a compression chamber acoustically coupled at one end to the back of the loudspeaker cone. The compression chamber is acoustically coupled to both the tuned acoustical chamber and the transmission port of the enclosure walls by means of an acoustical coupling.

Abstract: A self-contained loud speaker for installation below the floor level is placed in an enclosure which is fitted in a hole in the floor. The bottom of the enclosure contains a jute mat and the speaker assembly is placed in the enclosure resting on the jute mat. The speaker assembly has a sound deflecting nose cone in a bottom portion and a speaker in a top portion. The sound from the speaker is directed downwardly toward the nose cone. The nose cone deflects the sound upwardly to above the floor level. A perforated baffle covers the front of the speaker and protects it from damage. The back of the speaker is covered by a can which also protects the speaker from damage. The sides of the can have louvres to permit the sound to pass out through the back of the can and to relieve back pressure on the speaker. The speaker is spaced above the nose cone by peripheral spacers at flanged edges of the baffle and the speaker can and at the flanged edge of the nose cone portion.

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 thereby increasing the apparent compliance of the speaker enclosure. The loudspeaker system also includes a vibratable cone. The device may also permit the varying of the mass of the moving system with respect to frequency. The device for effectively enlarging the volume of the speaker enclosure includes a gas having a Joule-Thomson coefficient of less than zero above its inversion temperature, and an inversion temperature below the ambient temperature of the environment in which the device is to be used.

Abstract: A speaker system includes a housing with four side panels and a back panel. A speaker mounting panel with a plurality of openings therethrough is positioned opposite the back panel to enclose the housing and define an acoustic chamber therein. A packed fibrous sheet material is attached to cover the interior surfaces of the side and back panels. A pair of unmatched drivers and a tweeter are mounted to the mounting panel so that each projects frontwave sound through one of the panel openings and backwave sound into the acoustic chamber. An open-ended cylindrical member defining an acoustic passageway is attached about the periphery of another mounting panel opening and extends part way into the acoustic chamber. An acoustic curtain extends between opposite side panels in a serpentine configuration about a portion of the periphery of the two drivers on one side of the curtain and the periphery of the cylindrical member on the other side of the curtain.

Abstract: A loudspeaker comprises a horn having an open throat from which a pair of outwardly curved side walls extend. A cone driven speaker is mounted in the horn throat, and the horn with attached speaker is mounted in a base reflex enclosure which forms a chamber therebetween. A compression driven tweeter is mounted in one of the curved horn side walls, and a port is disposed through the other horn side wall and communicates with the chamber to vent back waves.

Abstract: A loudspeaker holder including a baffle plate and a loudspeaker supported by the baffle plate is rotatably coupled to a portable sound reproducing device having an operating surface and an audio-amplifier for supplying a power output signal to the loudspeaker through a pin and opening coupling means. To utilize the loudspeaker, the loudspeaker holder is rotated about the pin to form a space between the baffle plate and the operating surface. The sounds generated by the loudspeaker are transmitted to the outside through the space and an opening provided in the baffle plate. In case of carrying the portable sound reproducing device, loudspeaker holder is rotated about the pin to bring the baffle plate into contact with the operating surface, and to extinguish the space.

Abstract: A speaker enclosure comprising a cabinet that defines an upper compartment and a lower compartment. A sectorial horn is mounted in the upper compartment and a prismatic member is disposed across the outlet of the horn to direct the sound energy upwardly and downwardly from the horn. Mounted in the lower compartment is a full range speaker which is spaced from the sides of the cabinet to provide side openings. Positioned behind the speaker is a W-shaped baffle which serves to deflect the sound energy emitted from the rear of the speaker outwardly through the side openings.

Abstract: A unidirectional speaker enclosure has a cylindrical cabinet supporting a speaker at its front end and having a closed bottom at its rear end. The front end constitutes a main aperture surrounded concentrically by a secondary aperture communicating with the rear face of the speaker membrane through two relatively large resonance chambers formed by two cylinders disposed concentrically within the cylindrical cabinet. The arrangement is such that a lag corresponding to a wavelength of the desired critical frequency is obtained between the backward wave and the forward wave produced by the speaker membrane.

Abstract: A high-fidelity speaker arrangement suitable for mounting in the wall structure of a wall is disclosed. A bass reflex speaker enclosure containing a plurality of speakers and an associated cross-over network comprises the speaker assembly to be mounted in the wall structure. A mounting assembly adapted for mounting between adjacent wall studs is secured to at least one of the wall studs and receives therein the speaker enclosure. Both the mounting assembly and the speaker assembly have a depth dimension that is substantially equal to the depth of a standard wall stud, and a width dimension substantially equal to the nominal inside spacing between adjacent wall studs. A trim frame and removable cover grille is provided to finish the mounted speaker arrangement. When mounted, the speaker arrangement gives the appearance of being substantially a continuation of the surface of the wall while enabling the speaker enclosure to provide full range high-fidelity sound reproduction into the room.

Abstract: A loudspeaker apparatus comprises an enclosure having a loudspeaker mounted on a surface thereof, means within the enclosure and cooperating with other surfaces thereof for initially directing sound energy emanating from the back of the loudspeaker through a first sound wave compression zone in a first direction and then substantially equally into each of two second sound wave compression zones in respective second directions opposed to the first direction, and means in each of the second compression zones for propagating the sound energy received thereby out of the enclosure, the propagating means either comprising a passive radiator mounted on a corresponding enclosure surface partially defining each of the second compression zones or comprising ports which face in a direction parallel to that in which the loudspeaker faces and which place each second compression zone into open communication with the outside of the enclosure.

Abstract: Port devices are provided which are mounted within bass-reflex speaker enclosures behind port openings therein. Each device has an outer mouth opening at the port opening of the speaker and an inner throat opening of smaller area, on the order of two-fifths that of the mouth opening. The devices are in forms including forms having cylindrical or polygonal tubular sections combined with planar inner end wall sections, a stepped form with an additional smaller inner tubular section, and forms with hemispherical and frusto-conical walls. The throat-mouth area ratios and the ratios of the volumes of the devices of those of the enclosures are such as to extend and increase low frequency response without producing booming effects.

Abstract: A loudspeaker unit having an improved quality of bass reproduction for use in a stereo system with a second unit, which is a mirror image of it, to provide a better three-dimensional feeling on hearing the reproduced sound and to provide an increase in the area of the sound producer or source which includes a bass or woofer loudspeaker housed in a chamber, whose volume, together with the properties of the loudspeaker, is so designed that a desired resonant frequency is produced. An exponential horn is placed at an opening of the chamber, whose design is based on a Helmholtz resonator, whose captive air volume takes over the function of an active diaphragm, and the resonant frequency of the horn resonator has a specific relation to the resonant frequency of the chamber and the loudspeaker.

Abstract: A loudspeaker enclosure for housing a basic speaker and providing a conduit for channeling the sound waves emitted from the back surface of the basic speaker so that the sound waves are shifted in phase and emerge from a port in the enclosure and add to, rather than acoustically cancel, the sound waves emitted from the front surface of the basic speaker. The sound waves from the back surface of the speaker travel through the length of the conduit which is folded through several 45.degree. angles upon itself. These sound waves are directed through the conduit by striking and reflecting from a plurality of at least six reflector panels which are mounted at 45.degree. angles. In this manner, due to the nature of reflections at 45.degree. angles, each portion of a sound wave impulse travels the same distance as each other portion and the impulse emerges from the port basically intact. The enclosure has a unique shape because of the several foldings of the conduit through 45.degree. angles.

Abstract: A cabinet for improving the sound output of an amplifier including an upright housing with a speaker mounted on the front, the front having one or more baffle openings, a device herein called a sound lens inserted in the baffle opening, the vibration of the speaker serving to induce vibration of the sound lens by condensation and rarefaction, by the speaker, of the sound waves to either side of the housing so that the sound lens functions as a supplemental and complementary sound source.

Abstract: An acoustic speaker system suitable for use with a home stereo system has a bass speaker, a super-tweeter speaker, a tweeter speaker and a midrange speaker. The speakers are disposed in a generally ascending arrangement with the bass speaker occupying the bottom position, the super-tweeter speaker mounted immediately above the bass speaker, the tweeter speaker mounted immediately above the super-tweeter speaker and the midrange speaker mounted above the tweeter speaker. Speakers for left and right channels of a stereo system are disposed in mirror image in two enclosures. The bass speaker is enclosed in a folded trapezoidal transmission line, and the midrange and tweeter speaker are also housed in transmission line enclosures. A second embodiment contains speakers for both channels in one speaker system disposed in mirror arrangement about a diagonal axis, along a flattened S-shaped curve. An adjustable tuning mechanism is provided for fine tuning the bass transmission line enclosure.

Abstract: Loudspeaker equipment embodying a speaker, an enclosure for the speaker which is substantially closed except for the speaker opening and which is formed of walls which are thin and therefore capable of excitation and consequent sound generating vibrations under the influence of the speaker, the speaker equipment further including a reflector surrounding the speaker enclosure and having an open front through which the speaker is exposed, the walls of the reflector being spaced from the walls of the speaker enclosure to provide a passage through which sound generated by the walls of the speaker enclosure is reflected forwardly. The side walls of the reflector include a plurality of wall elements with adjacent edges spaced from each other and having a thickness dimension sufficiently small to provide for excitation and sound generation under the influence of the speaker enclosure within the reflector.

Abstract: An acoustic loudspeaker is mounted within a curved reflecting enclosure. Openings through the enclosure allow sound vibrations from the front of the speaker to emerge from the enclosure. A port in the enclosure, spaced away from the openings allow vibrations from the rear of the speaker to emerge from the enclosure. The inside of the enclosure is shaped to direct the desired vibrations through the port. A second embodiment has two speakers and two ports non-interferingly mounted in a single reflecting enclosure.

Abstract: A bass sound projection system comprises a cabinet containing at least one bass loudspeaker operating into a sound channel. The sound channel converges forwardly, relative to the direction of propagation of sound waves, of the loudspeaker to a throat and then diverges forwardly, relative to the direction of propagation of sound waves, of the throat to an acoustically open front end of the cabinet. The system may include a further bass loudspeaker and sound channel arranged as a mirror image of the first bass loudspeaker and sound channel, and the or each sound channel may be folded.

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: A low frequency loudspeaker apparatus includes a folded exponential horn which is divided to provide a bifurcated curved sound path from at least one electroacoustic transducer that is positioned at the throat of the horn to a volume into which sound waves are radiated that is located at the bifurcated mouth of the horn. The mean length of the folded exponential horn is such that, at an exponential rate of expansion between the throat and the bifurcated mouth, the area of the mouth is adequate for reproduction of low frequencies in the audible range. An illustrative embodiment of the low frequency loudspeaker apparatus has an effective low end cut-off frequency of 38 Hz. and affords 99 dB SPL output at three meters with one watt input which corresponds to about 20% efficiency measured in free space. Presence of a single boundary surface, such as a stage floor adjacent the mouth of the folded exponential horn, improves amplitude response by 3 to 6 dB.

Abstract: In an enclosed loudspeaker apparatus comprising a transducer, such as a loudspeaker, for producing acoustic radiation or sound when an electric current is applied to a drive means of the transducer, and an enclosure having an aperture in which the transducer is mounted for emission of the acoustic radiation therethrough with the drive means being in the interior of the enclosure; a heat pipe is provided for absorbing heat generated by electric current applied to the drive means, and for carrying such heat to the exterior of the enclosure so as to permit the application of increased currents to the drive means without overheating.

Abstract: A cubicle enclosure body for mounting a speaker having a plurality of reflex ports peripherally disposed on one face thereof outwardly of a centrally disposed circular aperture. A speaker element is in registry with the circular aperture. The combined cross-sectional area of the ports is approximately one-fifth (1/5) of the cross-sectional area of the speaker element. A first pair of ports lie diametrically opposed to each other on a vertical plane bisecting the enclosure body, and a second pair of ports lie diametrically opposed to each other on a horizontal plane bisecting the enclosure body. Each port extends inwardly of the housing, thereby coacting with reinforcing members to serve the structural purpose of making the housing rigid and immutable to vibration.

Abstract: A vent for linear control of pressure in an infinite baffle type loudspeaker system wherein an elongated "V" shaped trough is cut through the back wall of a speaker enclosure with the smaller side of the trough piercing the inner surface of the back wall of the enclosure and the larger side thereof piercing the outer surface thereof. Outside the outer wall, the trough is covered by a dispersion structure including a plurality of transverse plates generally at right angles thereto whose back edges are covered so that air flow into and out of the cabinet must pass through channels formed by the back wall of the enclosure, the plates and the cover.

Abstract: In a loudspeaker system having eight drivers on a baffle, the baffle has two port openings centered in respective squares embracing respective groups of four drivers. A tubular column extender snaps into each port opening and has a snap cap for detachably securing a polyester disk over the opening. A grill formed with two openings for accomodating the column extenders covers the drivers. A grill retainer formed with openings at each end for accomodating the column extenders abuts the grill, and clinch nuts screws on the threaded end of ach column extender to keep the grill retainer against the grill with the grill against the front baffle.

Abstract: A speaker cabinet comprises an enclosure having a top, bottom, front, back and two side panels, each panel being contiguous with an adjacent panel along its four edges, and the front panel having a sound port and interiorally of which is mounted a speaker, an improvement comprising a sound post extending and wedged between the front and back panels, an elongated bass bar secured along its length to the front panel, a pair of elongated blocks, each extending between and contacting the front and back panels, one of the blocks being secured to the top panel along its length and the other block secured to the bottom panel along its length, and a support plate secured along the back panel and extending between the side panels.

Abstract: A loudspeaker enclosure is disclosed which includes a horizontal bottom wall, parallel spaced vertical front and rear walls connected with the bottom wall, the front wall containing an opening for receiving a loudspeaker, and a horizontal top wall connected with the upper edges of the front and rear walls. The invention is characterized by the provision of vertical baffle walls which define a converging compression chamber behind the loudspeaker opening in the front wall, and a pair of exponential folded horns arranged laterally on opposite sides of the compression chamber. Each of the baffle walls between the compression chamber and the folded horns contains at least one opening adjacent its forward edge, each of the openings having a generally trapezoidal vertical cross-section, the vertical dimension of the front portion of the opening being greater than the vertical dimension of the rear portion of the opening.

Abstract: The disclosure concerns itself with labyrinth speakers systems which are provided with a plurality of internal partitions which are generally spaced from each other and are provided with apertures therein to form at least one tortuous path for a backwave generated by a loudspeaker. In one embodiment, the partitions are substantially cylindrical walls concentrically aligned with each other. The cylindrical walls have different diameters to form annular intermediate chambers. Other embodiments described include partitions which are planar and are substantially rectangular in shape. These partitions are spaced from each other along an axis of symmetry and are alternately provided with peripheral and central openings so that the backwave, while propagating between an initial and a final chamber of the enclosure, are successively broken up into a substantially annular shape and subsequently reconstituted.

Abstract: A loudspeaker system is disclosed having a rigid framework which contains a high compliance loudspeaker connected to an adjustable air column tube. The adjustable air column tube provides exact 1/4 wavelength tuning for the speaker system, to further improve its low frequency response, in accordance with tuned enclosure theory.

Abstract: Loudspeaker equipment embodying a speaker, an enclosure for the speaker which is substantially closed except for the speaker opening and which is formed of walls which are thin and therefore capable of excitation and consequent sound generating vibrations under the influence of the speaker, the speaker equipment further including a reflector surrounding the speaker enclosure and having an open front through which the speaker is exposed, the walls of the reflector being spaced from the walls of the speaker enclosure to provide a passage through which sound generated by the walls of the speaker enclosure is reflected forwardly.

Abstract: A cone speaker is mounted to a horn within a reflex chamber behind a forward opening through the chamber, and the forward end of a horn is attached to the opening. The speaker is connected in the entrance discharging rearwardly into the chamber, and forwardly into the horn. The horn includes a restriction between the forward end of the horn and the speaker, and ports are formed through the horn, entering the restriction.

Abstract: A phase plug structure is described which is an intermediate element between a conventional fiber cone loudspeaker and an exponential horn. The purpose of the phase plug is to equalize acoustical path lengths and thereby minimize high-frequency cancellations caused by phase differences. The design of the phase plug is based upon an analysis of both low-frequency and high-frequency horn behavior. A usable bandwidth of four octaves is obtained over a sharply-defined angle of radiation.In accordance with another embodiment of the invention, an enclosure is provided having a first exponential radiator, of relatively small size attached to the front of the speaker, and a relatively large exponential radiator coupled to the rear surface of the speaker for improved base response.

Abstract: A multiple driver loudspeaker system comprises two angularly spaced rear rectangular baffles each nearly filled with four closely spaced full-range small loudspeakers with a port tube passing through the center of each rear baffle and the junction therebetween. A front baffle carries a small centrally located loudspeaker. The front loudspeaker is backed by a cavity that is vented through the port tube at the intersection between the rear baffles. Each of the remaining loudspeakers is backed by a cavity with the four cavities associated with each rear baffle being vented through the associated port tube through channels located at the front of each cavity. Two bullets are cantilevered from the front baffle rearward and essentially concentric within the respective centrally located ports. The volume of each of the nine cavities is substantially the same.

Abstract: A multiple driver loudspeaker system comprises two angularly spaced rear rectangular baffles each nearly filled with four closely spaced full-range small loudspeakers with a port tube passing through the center of each rear baffle and the junction therebetween. A front baffle carries a small centrally located loudspeaker. The front loudspeaker is backed by a cavity that is vented through the port tube at the intersection between the rear baffles. Each of the remaining loudspeakers is backed by a cavity with the four cavities associated with each rear baffle being vented through the associated port tube through channels located at the front of each cavity. Two bullets are cantilevered from the front baffle rearward and essentially concentric within the respective centrally located ports. The volume of each of the nine cavities is substantially the same.

Abstract: A speaker system comprising a speaker cabinet having a forward baffle plate, two side plates and a rear plate, a passive diaphragm, a speaker mounted in the baffle plate of the speaker cabinet, an opening disposed in the baffle plate next to the speaker as an outlet for the sound radiated from the passive diaphragm, a dividing plate slantedly disposed between the baffle plate and the rear plate of the speaker cabinet, the dividing plate dividing the speaker cabinet into a first part including the speaker and a second part including the opening, the passive diaphragm being mounted in the dividing plate.

Abstract: A speaker assembly for mounting in an oval acoustic baffle opening such as the rear deck of an automobile comprises an oval unitary tuned port and frame for a moving voice coil loudspeaker.

Abstract: A speaker structure comprising a tetrahedronal shell having an upper end and an equilateral triangular base with equisized triangular walls and with the margins of the adjacent walls and base being secured together and wherein one of the walls includes a pattern of port openings and these openings are arranged about a central opening spanned by a speaker which is fixed thereabout.

Abstract: A cabinet for improving the sound output of an amplifier, the cabinet being in the form of an upright rectangular housing with a horizontal partition dividing the interior into an upper and lower portion, the partition having a speaker opening and a baffle opening, a speaker being mounted in the speaker opening for upward projection of the sound into the housing upper portion, the speaker being connected to the amplifier, a sounding board within the housing upper portion inclined at an angle from the housing rear upwardly towards the housing front, a sheet of metal affixed to the horizontal partition and covering the baffle opening, the vibration of the speaker serving to drive the metal baffle by condensations and rarefaction of the sound waves to either side of the horizontal partition so that the metal baffle functions as a supplemental and complementary sound source.

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 system has a cabinet in which a loudspeaker is mounted, the cabinet supporting therein a hollow duct which provides sound communication between the exterior and interior of the cabinet. A standing wave prevention member made of a sound absorbent material is disposed within the duct in spaced relation thereto, the member being smaller in volume than the duct.

Abstract: A loudspeaker system comprises a woofer in a front panel, a midrange driver facing to the front and a tweeter in a corner panel separated from the midrange driver by the woofer and pointing to the front and side with a crossover network arranged to energize at least the midrange and tweeter in an overlapping frequency range. An adjustable deflector is positioned near the tweeter. Another embodiment of the invention has only a woofer and a tweeter on only one corner panel with the crossover network arranged to energize the two in a common frequency range that is greater than an octave.

Abstract: A speaker system comprised of an enclosure with a partition inside. The partition, set apart from a wall of the enclosure, has an aperture in it. A loudspeaker, mounted at the wall, has a speaker cone projecting into the aperture in the partition.

Abstract: A speaker system comprising a speaker unit, a drone cone driven by the speaker unit; and a removable weight loaded on the front of the drone cone which can be exchanged from the front of the drone cone.

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: In a bass-reflex type speaker system, in which sound signal waves radiating from the back of a speaker within a cabinet are emitted out through a hollow duct while the phase of the sound signal wave is reversed, the improvement comprising at least one dividing plate secured within the hollow duct and disposed parallel to the longitudinal direction of the duct or a hollow pipe with a diameter smaller than that of the duct, the hollow pipe being coaxially disposed within the hollow duct where the pipe may be made of sound absorbing material.