WO1993012637A1 - Haut-parleur esthetique modifiable - Google Patents

Haut-parleur esthetique modifiable Download PDF

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Publication number
WO1993012637A1
WO1993012637A1 PCT/US1992/010531 US9210531W WO9312637A1 WO 1993012637 A1 WO1993012637 A1 WO 1993012637A1 US 9210531 W US9210531 W US 9210531W WO 9312637 A1 WO9312637 A1 WO 9312637A1
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WO
WIPO (PCT)
Prior art keywords
acoustic
cabinet
loudspeaker
drivers
face
Prior art date
Application number
PCT/US1992/010531
Other languages
English (en)
Inventor
Thomas R. Blakeslee
Adam Sadigursky
Original Assignee
Blakeslee Thomas R
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blakeslee Thomas R filed Critical Blakeslee Thomas R
Publication of WO1993012637A1 publication Critical patent/WO1993012637A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B81/00—Cabinets or racks specially adapted for other particular purposes, e.g. for storing guns or skis
    • A47B81/06—Furniture aspects of radio, television, gramophone, or record cabinets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/021—Casings; Cabinets ; Supports therefor; Mountings therein incorporating only one transducer

Definitions

  • This invention relates to acoustic loudspeakers and, more particularly, to an acoustic loudspeaker designed to display pieces of art on a wall.
  • the pieces of art can be changed, and the invention includes a method of displaying differing pieces of art.
  • Most entertainment systems for the home or the like include a plurality of audio loudspeakers, each of which includes one or more acoustic drivers (often themselves referred to as speakers) in a cabinet.
  • Each driver has a diaphragm covered by a grille cloth at the front face of the cabinet to transmit radiant energy to the room or other space within which the speaker is housed. Grille cloths often are black or other dark color to hide the driver(s) without requiring tight weaves which will interfere with the radiation of acoustic energy.
  • speaker aesthetics is quite limiting.
  • Those in the field have believed it necessary to have relatively unsightly speaker constructions in order to have the high- performance acoustic characteristics required by many listeners.
  • music lovers or other audiophiles have had little choice but to sacrifice their homes' interiors to big, free standing loudspeakers.
  • the present invention relates to a method of disguising an acoustic loudspeaker, and a speaker which lends itself readily to such method and yet provides the high-quality music and other audio reproduction demanded by many.
  • the method includes the steps of hanging a relatively thin cabinet loudspeaker on a wall and securing a desired piece of art over it without blocking the area of the face of the speaker from which acoustic energy is to radiate. This lack of blocking either can be provided by making an appropriate provision for the passage of the acoustic energy through the piece of art itself or by assuring that the piece of art does not cover the area in question.
  • the method of the invention also includes the step of replacing the piece of art with a different piece of art when desired.
  • the art which disguises the loudspeaker can be changed, such as for interior redecorating.
  • the location of the speaker and, hence, the art within the room likewise can be changed.
  • the loudspeaker of the invention has many different features which are responsible for it providing high- quality audio reproduction and yet enabling the cabinet to be sufficiently thin that it easily can be disguised with a piece of art.
  • it includes a plurality of elongated parallel panels which extend between the speaker cabinet back wall to its front wall, to impart strength to the latter. These panels divide the acoustic volume defined by the cabinet into a plurality of elongated acoustic cavities.
  • an acoustic block is provided in each of these cavities to absorb unwanted resonances.
  • Each cavity becomes, in essence, a very low Q tuned filter.
  • each of the strengthening panels is provided with holes for the flow of air or another carrier of acoustic energy between the cavities to enable the whole cabinet volume to act as a bass reflex acoustic cavity.
  • the loudspeaker construction further includes an acoustic driver that has a diaphragm secured to the face of the cabinet and a driving component for such diaphragm which extends through and is tightly coupled to the cabinet back wall.
  • an acoustic driver that has a diaphragm secured to the face of the cabinet and a driving component for such diaphragm which extends through and is tightly coupled to the cabinet back wall.
  • Another feature of the speaker is that it includes a crossover network designed particularly for pairs of acoustic drivers which are concentric with one another - drivers that have a common acoustic radiation center.
  • the corner frequencies provided by the crossover network i.e., each of the frequencies at which the audio amplitude provided by the drivers with the selected values of the crossover components results in the series reactance equaling the driver impedance, are spaced from one another by one or more orders of magnitude, and the audio amplitudes of the speakers between the corner frequencies are added together.
  • the loudspeaker includes a frame as part of the combination adapted to hold the art over the cabinet face without blocking the area discussed above from which acoustic energy is to radiate.
  • the frame is secured to the cabinet and held in position by frictional engagement with the cabinet, e.g., with opposed narrow edge walls of the cabinet, so that it is easily removable to change the art.
  • the loudspeaker also includes a bass reflex port which extends through one of the narrow walls. The location of this port in a narrow edge wall of the cabinet assures that when the cabinet is hung on a room wall, the port will be adjacent such room wall to enhance amplification of bass by the wall.
  • the port is also so located that it is not interfered with by the frame engaging the opposed narrow walls of the cabinet as discussed above.
  • a fabric sheet typically is held by the frame and the location of the port in the narrow edge wall places it at a location at which the flow of the large volume of air required for bass will not be impeded by such cloth.
  • FIG. 1 is an exploded view of a preferred embodiment of the invention, showing a frame for holding a poster or other piece of fine art, exploded from the remainder of the loudspeaker;
  • FIG. 2 is a side elevation view of the preferred embodiment illustrated in FIG. 1;
  • FIG. 3 is an exploded perspective view of the interior of the loudspeaker cabinet
  • FIG. 4 is a plan view of the loudspeaker cabinet with the front wall removed;
  • FIG. 5 is an enlarged sectional view illustrating the relationship of the preferred acoustic drivers of the invention to the front and back walls of the cabinet;
  • FIG. 6 is an idealized graphical view of a comparison of acoustic response obtainable with the speaker of the invention
  • FIG. 7 is an electrical schematic diagram of a crossover network, showing its electrical connection to a pair of acoustic drivers that are part of the preferred embodiment of the invention
  • FIG. 8 is an idealized graphical representation of the relationship of the audio amplitude in adjacent frequency spectrum sections covered by a pair of drivers of a conventional acoustic loudspeaker.
  • FIG. 9 is an idealized graphical representation similar to FIG. 8 of the audio amplitude provided between adjacent frequencies when the values of the crossover network components are selected in accordance with the invention.
  • FIGS. 1 and 2 illustrate an embodiment of the invention that is particularly adapted to disguise a speaker as a poster or the like piece of artwork.
  • the speaker generally referred to by the reference numeral 11, includes a frame 12 secured as will be described to a cabinet 13.
  • a pair of concentric acoustic drivers 14 and 16 are located in the lower corner of such cabinet.
  • Frame 12 circumscribes, as is conventional, a rectangular matting 17 having an exterior fabric sheet. However, as will be discussed below, the covered matting 17 itself is not entirely conventional.
  • a rectangular transparent sheet 15 of acrylic or the like is provided as is typical to hold a poster (not shown) in position against the matting 17.
  • Cabinet 13 is made up of relatively broad coextensive front and back walls 18 and 19, respectively, and relatively narrow edge walls 21-24. These edge walls are opposed top and bottom walls 22 and 24 and opposed side walls 21 and 23.
  • Frame 12 is secured to the cabinet only by frictional engagement of the interior surfaces of the exterior members of the same with the edge walls of the cabinet. While from the broad standpoint it is only necessary that the frame engage opposed ones of the narrow edge walls, e.g., the opposed top and bottom edge walls, it is preferable that it engage all four of the edge walls 21-24 as in this embodiment. It will be recognized that because of the frictional securance, the frame may be easily removed manually from the cabinet in order to change or replace the art which is held over the face of the cabinet.
  • a frame can include special cross members or the like to provide such frictional engagement.
  • the exterior dimension of the cabinet in the vertical direction is less than that desired for the frame.
  • the frictional engagement is therefore provided by a linear cross member 25 in the frame which is parallel to and opposed to the lower frame cross member to provide the opposed frictional engagement.
  • the frame dimensions in the embodiment illustrated are dictated by aesthetics, rather than simply the necessity to disguise the speaker. It is necessary from the invention standpoint to provide the "matting" 17 with a relatively wide bottom beyond the poster in order to allow acoustic radiation flow from the drivers as will be described. In order to balance the same aesthetically, an additional frame portion is provided above the top edge wall of the cabinet as from FIG. 2. In one implementation, the frame was about 30 inches by 39 inches, whereas the cabinet dimensions at its front face was 22.5 inches by 29.5 inches.
  • a standard covered-type matting having a flexible fabric sheet over a backing board fits within the remainder of the frame.
  • the backing board is cut away at the location of the drivers 14 and 16 to permit passage to the fabric sheet of acoustic energy radiated thereby.
  • the material of the fabric sheet is selected to pass the acoustic energy frequencies provided by the drivers 14 and 16 with little or no absorption. The result is that the piece of art does not interfere with the radiant acoustic energy provided by the diaphragms at the face of the cabinet.
  • the piece of art may fill the frame and itself include an area which does not block the area of the cabinet face having the diaphragm.
  • the frame may be exterior to the art and/or its matting as illustrated, it also can be interior thereof. That is, the art or matting can be stretched over the frame members which frictionally engage the cabinet edge walls, rather than being interiorly thereof.
  • the cabinet can be provided, if desired, with special members rather than the edge walls for the engagement.
  • the edge walls may be built up or have special members secured to the same exteriorly of the edge walls of the cabinet to provide the frictional engagement.
  • a single frame be used to provide a piece of art to disguise a pair of spaced apart speaker cabinets having one or more features of the instant invention.
  • Such cabinets can be spaced apart by a section which includes other electronics normally associated with an audio or audio/visual system of which the speakers having such cabinets may be a part.
  • the frame can be permanently installed on the cabinet and the artwork screwed, glued or otherwise secured to the front of the cabinet.
  • Such single cabinet could also include the electronics which is normally associated with an audio or audio/visual system of which the speaker is a part.
  • the speaker itself is designed to provide the high quality audio reproduction audiophiles typically require. It is desirable in such an arrangement having relatively broad front and back walls for the cabinet, that means be provided to support the integrity of the same in spite of their span, and yet not interfere with the acoustic qualities provided by the cavity of the cabinet. Most desirably, such means will enhance the audio quality as an added bonus.
  • the invention includes such means. With reference to FIGS. 3 and 4, it will be seen that the interior of the cabinet is divided into a plurality of cavities 26-35 by elongated, parallel panels 36-39. That is, the panels are parallel to the cabinet side edge walls 21 and 23, and each of the same extends between, and is rigidly connected to, the front and back walls of the cabinet.
  • This extension provides supporting strength to the front and back walls to prevent unwanted vibration in spite of the breadth of such walls.
  • the panels are provided, however, with numerous holes 41 to permit passage therebetween of air or some other carrier of acoustic energy so that the reflex nature of the full volume defined by the cabinet is not destroyed. (As illustrated, some of the holes 41 are larger than others.) It has been found that simple pegboard material can be used to make the panels. It is desirable, though, to provide additional holes through the same to provide the larger apertures.
  • the blocks 42 further divide each of the cavities defined by the panels 36-39 into more than one cavity, i.e., there are holes for passage of acoustic energy into the regions defined by the panels on both sides of the blocks in most instances.
  • Each of the blocks can be said, though, to define an acoustic length for the cavities of which it is a part since it does absorb one or more orders of resonant frequencies irrespective of its size and location.
  • Each of the blocks is a piece, for example, of acoustical foam, such as the polyether polyurethane foam (65 ppi, 1.7 lbs./in.) sold by the trademark HYFONIC 1, manufactured by Foamex, Division of Knoll International Holdings, Inc., Eddystone, Pennsylvania. It will be recognized, however, that other materials also can be used and, in fact, in some instances it will not be desirable that a block extend fully between panels - in some instances the block simply could be a piece of strategically located sound absorptive material.
  • acoustical foam such as the polyether polyurethane foam (65 ppi, 1.7 lbs./in.) sold by the trademark HYFONIC 1, manufactured by Foamex, Division of Knoll International Holdings, Inc., Eddystone, Pennsylvania.
  • FIG. 5 is an enlarged side elevational view which illustrates this construction.
  • the driver 14 is considerably larger than the driver 16 and in essence "hides" most of such driver in such figure.
  • Driver 14 is made up of a supporting framework 51 for a vibrating diaphragm 52.
  • Such framework 51 includes a ring 53 which circumscribes the same and is secured in a mating ledge 54 in the cabinet front wall 18. The result is that the diaphragm is indirectly secured in mating relationship to the front wall at the face of the cabinet.
  • Driver 14 further includes a driving component 54 for the diaphragm.
  • driving component extends through and is coupled with rigid securance to the cabinet back wall so as to enable the back and front walls of the cabinet to be spaced close to one another and to impart to the back wall, the reactive force on the driving component resulting from radiation of acoustic energy by the diaphragm.
  • driving component includes, as is usual, a magnet (not shown) for moving the diaphragm to cause it to radiate the desired acoustic energy.
  • the driving component extends within a disk-shaped aperture in the back wall defined at 56, rigidly against an annular ridge 57 in the back wall. It engages the ridge 57 for the full periphery of the latter.
  • a sealant bead 58 is provided to assure the hermetic integrity of the cavity and assure that the major contact needed to transmit the force between the driver and the back wall is provided. This construction is a major factor in the fact that the speaker (without the frame) in the implementation mentioned earlier is only 3 inches thick.
  • Driver 16 is mounted within the driver 14 concentric with the same, i.e., with its center of audio radiation coinciding with the center of audio radiation of the driver 14. The result is that the two drivers are, in essence, a point source of acoustic radiation. As mentioned previously, most of the driver 16 is hidden by driver 14 in FIG. 5. What is illustrated of driver 16 is a pair of terminals 59. It will be recognized, however, that the securance of such driver in driver 14 indirectly results in the cabinet back wall 19 resisting the reactive force for the driving component of driver 16.
  • driver 14 is a 6.5 inch polypropylene woofer-mid range with a cast magnesium frame and a 22.5 ounce (.64 Kg) magnet.
  • the driver 16 is a one inch cloth dome tweeter with a neodymium-iron-boron magnet and ferrofluid cooling and damping.
  • the speaker of the invention also relies on bass reflex.
  • holes 41 assure that the full volume defined by the cabinet is utilized to generate reflex energy.
  • a plate 61 is included to provide a small interior cavity with side edges, one of which is denoted by reference numeral 62, over a port 63 (FIG. 3) .
  • This port is in the bottom side wall 24 so as to be adjacent whatever room wall the driver is hung on. The room wall acts to amplify the bass.
  • the port construction is tuned to a much lower frequency than normal. Without the wall, there would be inadequate bass response with a flat but lower level at such frequency.
  • Wall-mounted speakers have a 6 dB advantage in bass response due to the combination of two effects: (1) the wall reflects non-directional bass frequencies for a 3 dB boost, and (2) the speaker's efficiency is doubled (3 db) because the radiation angle is halved so the diaphragm is able to get a firmer "bite" on the air.
  • the design (1) takes advantage of the above bass- reinforcing effect of the wall immediately behind it; (2) uses a Qt of less than .3 (large magnet) driver with a cabinet volume approximately equal to the equivalent volume, Vas, of the driver 14; and (3) uses a large series inductor to flatten the resulting response by reducing output on frequencies above the bass frequencies, e.g., 340 Hz in an implementation of the invention. Most desirably, this inductor also acts as an inductor for the crossover network described below and rolls off frequencies to be handled by the tweeter.
  • FIG. 6 provides an idealized graphical representation of the bass response. Line 64 represents such response. If either the speaker was not adjacent the wall or a large inductor was not used as discussed above, it is expected that the response would be basically the same as that represented by the dotted line 66.
  • Drivers 14 and 16 are electrically connected together via a particular crossover network which cooperates with the remainder of the features of the invention to assure high quality audio output. It is particularly designed for use with drivers which are concentric with one another as are drivers 14 and 16. It is essentially similar to other crossover networks from the first order standpoint in that it is an LC design that is, in essence, a tuned filter which directs the bass power to the low frequency driver 14 and the high frequency power to the driver 16.
  • the inductance of the circuit is represented by an inductor 71 and the capacitance is represented by capacitor 72. These components are connected between the two drivers as is illustrated. This is a typical connection except that the polarity between the connection with the two speakers is reversed to assure phase coherence.
  • the tweeter since the phase at the tweeter driver 16 leads by almost 90 degrees at the tweeter and lags by 90 degrees at the woofer driver 14, the tweeter must be connected in reverse polarity compared to a conventional crossover, even though its acoustic center closely matches that of the woofer.
  • FIG. 8 is an idealized illustration of amplitude versus frequency that is considered to be an ideal.
  • the corner frequencies provided by the crossover network are represented at 81 and 82. These corner frequencies are those frequencies at which the audio amplitude provided by the respective drivers with the selected values of the crossover components, results in the series reactance equalling the driver impedance.
  • the two sections of a frequency spectrum handled by two drivers connected by a crossover network are represented in FIG. 8 by 83 and 84.
  • the frequency extent of the crossover section, section 86 is minimized. (It is recognized, though, that relatively complicated arrangements have been provided in the past which do not necessarily minimize such area.) In any event, the ideal situation would be one in which there is, in essence, no crossover section, with the result that a truly flat response would be provided.
  • the components of the crossover network are selected so that the corner frequencies of the two drivers are separated by one or more orders of magnitude.
  • Corner frequency 81 is the frequency at which the audio amplitude output of driver 14 begins to decrease
  • corner frequency 82 ' is the frequency at which the audio amplitude output of driver 16 reaches steady-state operation.
  • the corner frequency 81' was at 340 Hz
  • the corner frequency 82' was at 12,000 Hz.
  • the invention relies on the addition of the audio output of the two drivers to provide a flat response in section 86'. This sum is represented by line 87.
  • the value of the capacitor 72 is selected to be 2 microfarad, and the value of inductor 71 selected to be 2 Hy.
  • a normal first-order crossover network design for a 8 ohm woofer and a 6 ohm tweeter would use a capacitor approximately five times larger and an inductor about 3-1/2 times smaller for a 2,200 Hz crossover frequency.
  • crossover components will be determined by the response of the specific drivers. In fact, it has been found that some drivers have required that the 2 microfarad series capacitor be replaced by a 1 microfarad capacitor in parallel with a series connected 1 microfarad capacitor and 22 ohm resistor. Note also that this arrangement " works best when the two drivers are concentric with one another.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

L'invention décrit un haut-parleur audio (11) particulièrement conçu pour servir d'élément de décoration (15) suspendu à une paroi murale. On s'assure que les aspects esthétiques du haut-parleur ne limitent pas la haute qualité de la reproduction des fréquences audio. Le haut-parleur (11) présente plusieurs caractéristiques lui permettant d'assurer une reproduction audio d'excellente qualité malgré sa minceur relative. Des tableaux de connexions (36-39) divisent la cavité de l'enceinte en une pluralité de cavités résonantes parallèles (26-35) et servent également à relier les parois avant et arrière relativement larges (18, 19) de ladite enceinte, de façon à améliorer leur résistance à des vibrations indésirables. On utilise un haut-parleur grave pour fréquences moyennes relativement important (14) s'étendant dans la paroi arrière de ladite enceinte, de manière à ne pas produire d'effets négatifs sur la minceur de l'enceinte. L'invention décrit également une ouverture bass-reflex (63) ainsi qu'un circuit diviseur de fréquence particulièrement conçus pour ledit haut-parleur.
PCT/US1992/010531 1991-12-12 1992-12-08 Haut-parleur esthetique modifiable WO1993012637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80670891A 1991-12-12 1991-12-12
US07/806,708 1991-12-12

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WO1993012637A1 true WO1993012637A1 (fr) 1993-06-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365250A (en) * 2000-07-21 2002-02-13 B & W Loudspeakers Acoustic structures for loudspeakers

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160225A (en) * 1962-04-18 1964-12-08 Edward L Sechrist Sound reproduction system
US3941638A (en) * 1974-09-18 1976-03-02 Reginald Patrick Horky Manufactured relief-sculptured sound grills (used for covering the sound producing side and/or front of most manufactured sound speaker enclosures) and the manufacturing process for the said grills
US4164988A (en) * 1976-08-25 1979-08-21 Admiral Corporation Fine tuned, column speaker system
US4244096A (en) * 1978-05-31 1981-01-13 Kyowa Denki Kagaku Kabushiki Kaisha Speaker box manufacturing method
US4903300A (en) * 1989-01-05 1990-02-20 Polk Investment Corporation Compact and efficient sub-woofer system and method for installation in structural partitions
US4923032A (en) * 1989-07-21 1990-05-08 Nuernberger Mark A Ceiling panel sound system
US4926962A (en) * 1986-10-10 1990-05-22 Graham Gary T Decorative speaker cover
US5109422A (en) * 1988-09-28 1992-04-28 Yamaha Corporation Acoustic apparatus
US5197103A (en) * 1990-10-05 1993-03-23 Kabushiki Kaisha Kenwood Low sound loudspeaker system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160225A (en) * 1962-04-18 1964-12-08 Edward L Sechrist Sound reproduction system
US3941638A (en) * 1974-09-18 1976-03-02 Reginald Patrick Horky Manufactured relief-sculptured sound grills (used for covering the sound producing side and/or front of most manufactured sound speaker enclosures) and the manufacturing process for the said grills
US4164988A (en) * 1976-08-25 1979-08-21 Admiral Corporation Fine tuned, column speaker system
US4244096A (en) * 1978-05-31 1981-01-13 Kyowa Denki Kagaku Kabushiki Kaisha Speaker box manufacturing method
US4926962A (en) * 1986-10-10 1990-05-22 Graham Gary T Decorative speaker cover
US5109422A (en) * 1988-09-28 1992-04-28 Yamaha Corporation Acoustic apparatus
US4903300A (en) * 1989-01-05 1990-02-20 Polk Investment Corporation Compact and efficient sub-woofer system and method for installation in structural partitions
US4923032A (en) * 1989-07-21 1990-05-08 Nuernberger Mark A Ceiling panel sound system
US5197103A (en) * 1990-10-05 1993-03-23 Kabushiki Kaisha Kenwood Low sound loudspeaker system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365250A (en) * 2000-07-21 2002-02-13 B & W Loudspeakers Acoustic structures for loudspeakers
WO2002009486A3 (fr) * 2000-07-21 2002-12-27 B & W Loudspeakers Structures acoustiques
EP1304015A2 (fr) * 2000-07-21 2003-04-23 B & W Loudspeakers Limited Structures acoustiques
GB2365250B (en) * 2000-07-21 2004-06-16 B & W Loudspeakers Acoustic structures
US6896096B2 (en) 2000-07-21 2005-05-24 B&W Loudspeakers Limited Acoustic structures

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