EP0876740A1 - Loudspeaker device - Google Patents

Loudspeaker device

Info

Publication number
EP0876740A1
EP0876740A1 EP96904382A EP96904382A EP0876740A1 EP 0876740 A1 EP0876740 A1 EP 0876740A1 EP 96904382 A EP96904382 A EP 96904382A EP 96904382 A EP96904382 A EP 96904382A EP 0876740 A1 EP0876740 A1 EP 0876740A1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker device
spaces
space
woofer
cavity
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP96904382A
Other languages
German (de)
French (fr)
Inventor
Willibrordus Hermanus Korfage
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0876740A1 publication Critical patent/EP0876740A1/en
Withdrawn legal-status Critical Current

Links

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
    • H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
    • H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line for loudspeaker transducers
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
    • 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 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
    • 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 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers

Definitions

  • the invention relates to a loudspeaker device.
  • Loudspeaker devices are known in many embodiments. It is generally known that the housing in which a woofer is arranged has a dominating influence on the fidelity of reproduction with which sound can be generated by the loudspeaker device.
  • a loudspeaker device comprising: a generally tubular housing having a cavity which is closed at a first end and open at a second end; and at least one woofer placed in an opening in the wall of this housing; which cavity comprises seven rotation- symmetrical mutually connecting spaces, which spaces have substantially the same shape and a common axis of symmetry; which spaces have corresponding linear dimensions from the first to the second end with substantially the following respective ratios: (1) 0.53
  • each space has a generally spherical shape.
  • each space has the shape of a semi-ellipsoid of revolution directed toward the first end and a semi- spherical shape directed toward the second end, wherein the relative axial lengths of said two shapes are substantially in a ratio of 9:7.
  • a preferred embodiment is herein characterized in that the necks have diameters which are 0.5 to 0.8 times the largest diameter of the adjacent spaces.
  • An embodiment wherein the housing consists predominantly of concrete has the advantage that the housing has a great density and a correspondingly large mass and that there is no danger of unintended co- vibration of the housing.
  • the cavity is lined with a layer consisting of a mixture of bitumen and rubber.
  • damping is also obtained for very high frequencies.
  • An embodiment is generally recommended in which the layer has a thickness of 1-6 mm.
  • a preferred embodiment has the special feature that the woofer is arranged in a hole in the wall of the third space.
  • the loudspeaker device according to the invention requires no internal damping.
  • the invention nevertheless also provides a variant in which the first and the second spaces are filled with porous damping material, such as mineral wool.
  • This variant is preferably characterized in that about ten times as much damping material is present in the first space as in the second space.
  • the embodiment can serve in which the length of the cavity corresponds with the resonance frequency of the built-in woofer.
  • a very fine directivity pattern of substantially monopole character is obtained with an embodiment comprising two symmetrically placed woofers facing away from each other. Another embodiment is provided with a tweeter, for instance a dome tweeter, placed in the vicinity of the woofer.
  • a tweeter for instance a dome tweeter
  • a specific embodiment has the special feature that the woofer and the tweeter are in phase linear arrangement. Such an embodiment is very simple to realize with a variant in which the woofer connects to the third space and the tweeter is situated in the region of the second space.
  • Figure 1 shows a cross section through a loudspeaker device according to the invention in a first embodiment
  • Figure 2 shows a perspective view of the device of figure 1;
  • Figure 3 shows a partial cross section, corresponding with figure 1, of a variant
  • Figure 4 shows a cross section through yet another embodiment
  • Figure 5 shows a connection diagram for the loudspeakers
  • Figure 6 shows an alternative connection diagram for the loudspeakers.
  • Figure 1 shows a loudspeaker device 1. This comprises a generally tubular concrete housing 2 with a cavity 3 which is closed at the upper end and open at the lower end, in addition to two woofers 4, 5 placed in openings in the wall of this housing.
  • the cavity 3 comprises seven rotation- symmetrical, mutually connecting, substantially spherical spaces 6, 7, 8, 9, 10, 11, 12 respectively. These spaces 6-12 have a common axis of symmetry which corresponds with the longitudinal axis of cavity 3.
  • the spaces 6-12 have diameters with substantially the following respective ratios: 0.53 - 0.80 - 1.00 - 0.89 - 0.75 - 0.67 - 0.60.
  • adjacent spaces mutually connect via necks, respectively 13, 14, 15, 16, 17, 18 with smooth rounded shapes.
  • the space 12 debouches into the outside space via a neck 19 with a shape widening toward the outside.
  • the cavity 3 is lined with a layer 20 consisting of bitumen mixed with rubber granules.
  • Damping material is arranged in the spaces 6 and 7.
  • the quantity of damping material in space 6 amounts to about ten times the quantity in space 7.
  • the damping material can for instance be natural or mineral wool.
  • the internal form of the device 1 is also reflected in the external design.
  • the spaces 6-12 are enclosed by a wall having approximately the same thickness everywhere.
  • the form shown in figure 2 which has the general appearance of a column consisting of spheres stacked one on top of anoth- er.
  • the loudspeakers 4 and 5 are directed away from each other and are connected in phase, so that loudspeaker device 1 has a substantially monopole character, at least up to a frequency determined by the dimensions of the loudspeakers.
  • the woofers 4, 5 are arranged in the region of the space 8. Placed in the region of the space 7 above the loudspeakers 4, 5 are tweeters respectively 21, 22. This placing is embodied such that the arrangement is phase linear relative to the woofers 4, 5. It must be understood in this respect that it may be desirable to give the radiation front of the loudspeaker a certain incline.
  • the housing 2 further comprises a foot flange
  • the loudspeaker device 1 is of the so-called "open* 1 type, which is desirable for reasons of quality.
  • Figure 4 shows a variant wherein a loudspeaker device 23 has a housing 24 which on the outside does not follow the internal contours but has a more or less flat outer form.
  • the drawback of this embodiment is that it is comparatively heavy.
  • the properties of such a device 23 are otherwise in principle the same as those according to figures 1 and 2.
  • the housing 24 can also have a rotation- symmetrical outer appearance. Attention is drawn to the fact that the basic shapes of the spaces 6-12 are imaginary spheres which substantially mutually tangential in the region of said necks 13-18.
  • the necks have diameters which are 0.5 - 0.8 times the largest diameter of the adjacent spaces.
  • FIG 3 shows a variant 25 wherein a housing 26 is embodied such that the spaces 27, 28 do not have a spherical shape but each have a general egg shape.
  • the relevant contours are drawn schematically in full lines in figure 3.
  • each of the spaces 27, 28 is rotation- symmetrical.
  • Each space has the shape of a semi-ellipsoid of revolution directed toward the closed end and a semi- spherical shape directed toward the open end.
  • the axial lengths of said two shapes are substantially in a ratio of 9:7.
  • Figures 5 and 6 show possible connection diagrams for the loudspeakers.
  • the loudspeakers 4, 5 are of the type which have a natural attenuation for the higher frequencies, for instance because the cone is covered with a neoprene rubber layer.
  • the dome tweeters 21, 22 take over the sound-radiating function from the natural cross-over frequency of the woofers.
  • the relevant take-over frequen- cy is determined by the impedance of loudspeakers 21, 22 and a series capacitor 29.

Landscapes

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

Abstract

A loudspeaker device comprises: a generally tubular housing having a cavity which is closed at a first end and open at a second end; and at least one woofer placed in an opening in the wall of this housing; which cavity comprises seven rotation-symmetrical mutually connecting spaces, which spaces have substantially the same shape and a common axis of symmetry; which spaces have corresponding linear dimensions from the first to the second end with substantially the following respective ratios: (1) 0.53, (2) 0.80, (3) 1.00, (4) 0.89, (5) 0.75, (6) 0.67, (7) 0.60; which spaces have smooth rounded shapes, are mutually connected via necks with smooth rounded shapes and are at least substantially mutually tangential with imaginary basic contour surfaces; wherein a neck widening toward the outside connects onto the space adjacent to the second end.

Description

LOUDSPEAKER DEVICE
The invention relates to a loudspeaker device. Loudspeaker devices are known in many embodiments. It is generally known that the housing in which a woofer is arranged has a dominating influence on the fidelity of reproduction with which sound can be generated by the loudspeaker device.
It is an object of the invention to embody a loudspeaker device such that a quality of reproduction can be realized which meets the highest possible required standards.
In order to realize this objective the invention provides a loudspeaker device, comprising: a generally tubular housing having a cavity which is closed at a first end and open at a second end; and at least one woofer placed in an opening in the wall of this housing; which cavity comprises seven rotation- symmetrical mutually connecting spaces, which spaces have substantially the same shape and a common axis of symmetry; which spaces have corresponding linear dimensions from the first to the second end with substantially the following respective ratios: (1) 0.53
(2) 0.80
(3) 1.00
(4) 0.89
(5) 0.75 (6) 0.67
(7) 0.60; which spaces have smooth rounded shapes, are mutually connected via necks with smooth rounded shapes and are at least substantially mutually tangential with imaginary basic contour surfaces; wherein a neck widening toward the outside connects onto the space adjacent to the second end. A specific embodiment has the special feature that each space has a generally spherical shape.
An alternative has the special feature that each space has the shape of a semi-ellipsoid of revolution directed toward the first end and a semi- spherical shape directed toward the second end, wherein the relative axial lengths of said two shapes are substantially in a ratio of 9:7.
A preferred embodiment is herein characterized in that the necks have diameters which are 0.5 to 0.8 times the largest diameter of the adjacent spaces.
An embodiment wherein the housing consists predominantly of concrete has the advantage that the housing has a great density and a correspondingly large mass and that there is no danger of unintended co- vibration of the housing.
It can nevertheless be advantageous to make use of an embodiment in which the cavity is lined with a layer consisting of a mixture of bitumen and rubber. In this manner damping is also obtained for very high frequencies. An embodiment is generally recommended in which the layer has a thickness of 1-6 mm.
A preferred embodiment has the special feature that the woofer is arranged in a hole in the wall of the third space. Other than most known devices, the loudspeaker device according to the invention requires no internal damping. The invention nevertheless also provides a variant in which the first and the second spaces are filled with porous damping material, such as mineral wool.
This variant is preferably characterized in that about ten times as much damping material is present in the first space as in the second space. In order to also provide the loudspeaker device according to the invention with the advantages of a transmission line, the embodiment can serve in which the length of the cavity corresponds with the resonance frequency of the built-in woofer.
A very fine directivity pattern of substantially monopole character is obtained with an embodiment comprising two symmetrically placed woofers facing away from each other. Another embodiment is provided with a tweeter, for instance a dome tweeter, placed in the vicinity of the woofer.
It will be apparent that to each woofer an associated tweeter is preferably added. The use of radiation in two directions has the known advantage that a very attractive, spatial sound picture can be realized.
A specific embodiment has the special feature that the woofer and the tweeter are in phase linear arrangement. Such an embodiment is very simple to realize with a variant in which the woofer connects to the third space and the tweeter is situated in the region of the second space.
The invention will now be elucidated with reference to the annexed drawings. Herein:
Figure 1 shows a cross section through a loudspeaker device according to the invention in a first embodiment;
Figure 2 shows a perspective view of the device of figure 1;
Figure 3 shows a partial cross section, corresponding with figure 1, of a variant;
Figure 4 shows a cross section through yet another embodiment; Figure 5 shows a connection diagram for the loudspeakers; and
Figure 6 shows an alternative connection diagram for the loudspeakers. Figure 1 shows a loudspeaker device 1. This comprises a generally tubular concrete housing 2 with a cavity 3 which is closed at the upper end and open at the lower end, in addition to two woofers 4, 5 placed in openings in the wall of this housing.
The cavity 3 comprises seven rotation- symmetrical, mutually connecting, substantially spherical spaces 6, 7, 8, 9, 10, 11, 12 respectively. These spaces 6-12 have a common axis of symmetry which corresponds with the longitudinal axis of cavity 3. The spaces 6-12 have diameters with substantially the following respective ratios: 0.53 - 0.80 - 1.00 - 0.89 - 0.75 - 0.67 - 0.60. As shown in figure 1, adjacent spaces mutually connect via necks, respectively 13, 14, 15, 16, 17, 18 with smooth rounded shapes. The space 12 debouches into the outside space via a neck 19 with a shape widening toward the outside.
The cavity 3 is lined with a layer 20 consisting of bitumen mixed with rubber granules. Damping material is arranged in the spaces 6 and 7. The quantity of damping material in space 6 amounts to about ten times the quantity in space 7. The damping material can for instance be natural or mineral wool.
As shown in figure 2, the internal form of the device 1 is also reflected in the external design. The spaces 6-12 are enclosed by a wall having approximately the same thickness everywhere. Thus created is the form shown in figure 2, which has the general appearance of a column consisting of spheres stacked one on top of anoth- er.
The loudspeakers 4 and 5 are directed away from each other and are connected in phase, so that loudspeaker device 1 has a substantially monopole character, at least up to a frequency determined by the dimensions of the loudspeakers. The woofers 4, 5 are arranged in the region of the space 8. Placed in the region of the space 7 above the loudspeakers 4, 5 are tweeters respectively 21, 22. This placing is embodied such that the arrangement is phase linear relative to the woofers 4, 5. It must be understood in this respect that it may be desirable to give the radiation front of the loudspeaker a certain incline. The housing 2 further comprises a foot flange
21 which can rest by means of legs 22 on the floor or on a board. It will be apparent that this also ensures that sound radiated via cavity 3 and neck 19 can reach the outside space. Also ensured in this manner is that the loudspeaker device 1 is of the so-called "open*1 type, which is desirable for reasons of quality.
Figure 4 shows a variant wherein a loudspeaker device 23 has a housing 24 which on the outside does not follow the internal contours but has a more or less flat outer form. The drawback of this embodiment is that it is comparatively heavy. The properties of such a device 23 are otherwise in principle the same as those according to figures 1 and 2. The housing 24 can also have a rotation- symmetrical outer appearance. Attention is drawn to the fact that the basic shapes of the spaces 6-12 are imaginary spheres which substantially mutually tangential in the region of said necks 13-18.
The necks have diameters which are 0.5 - 0.8 times the largest diameter of the adjacent spaces.
Figure 3 shows a variant 25 wherein a housing 26 is embodied such that the spaces 27, 28 do not have a spherical shape but each have a general egg shape. The relevant contours are drawn schematically in full lines in figure 3. In accordance with the teaching of the invention each of the spaces 27, 28 is rotation- symmetrical. Each space has the shape of a semi-ellipsoid of revolution directed toward the closed end and a semi- spherical shape directed toward the open end. The axial lengths of said two shapes are substantially in a ratio of 9:7.
Figures 5 and 6 show possible connection diagrams for the loudspeakers. In order to prevent phase effects and to embody a cross-over filter as simply as possible, use is made according to the invention of a direct connection of the woofers 4, 5. The loudspeakers 4, 5 are of the type which have a natural attenuation for the higher frequencies, for instance because the cone is covered with a neoprene rubber layer. The dome tweeters 21, 22 take over the sound-radiating function from the natural cross-over frequency of the woofers. The relevant take-over frequen- cy is determined by the impedance of loudspeakers 21, 22 and a series capacitor 29.
The difference between the wiring diagrams according to figures 5 and 6 lies in the fact that in figure 5 the woofers respectively the tweeters are connected in series, while according to figure 6 these loudspeakers are connected in parallel. It will be apparent that this will affect the terminal impedance and the value of capacitor 29. It is not however necessary to discuss this further within the scope of the invention as this relates to generally known techniques.
*****

Claims

1. Loudspeaker device, comprising: a generally tubular housing having a cavity which is closed at a first end and open at a second end; and at least one woofer placed in an opening in the wall of this housing; which cavity comprises seven rotation- symmetrical mutually connecting spaces, which spaces have substantially the same shape and a common axis of symmetry; which spaces have corresponding linear dimensions from the first to the second end with substantially the following respective ratios:
(1) 0.53 (2) 0.80
(3) 1.00
(4) 0.89
(5) 0.75
(6) 0.67 (7) 0.60; which spaces have smooth rounded shapes and are mutually connected via necks with smooth rounded shapes; wherein a neck widening toward the outside connects onto the space adjacent to the second end.
2. Loudspeaker device as claimed in claim 1, wherein each space has a general spherical shape.
3. Loudspeaker device as claimed in claim 1, wherein each space has the shape of a semi-ellipsoid of revolution directed toward the first end and a semi- spherical shape directed toward the other end, wherein the relative axial lengths of said two shapes are substantially in a ratio of 9:7.
4. Loudspeaker device as claimed in claim 1, wherein the necks have diameters which are 0.5 to 0.8 times the largest diameter of the adjacent spaces.
5. Loudspeaker device as claimed in claim 1, wherein the housing consists predominantly of concrete.
6. Loudspeaker device as claimed in claim 1, wherein the cavity is lined with a layer consisting of a mixture of bitumen and rubber.
7. Loudspeaker device as claimed in claim 6, wherein the layer has a thickness of 1-6 mm.
8. Loudspeaker device as claimed in claim 1, wherein the woofer is arranged in a hole in the wall of the third space.
9. Loudspeaker device as claimed in claim 1, wherein the first and the second spaces are filled with porous damping material, such as mineral wool.
10. Loudspeaker device as claimed in claim 9, wherein at least about ten times as much damping material is present in the first space as in the second space.
11. Loudspeaker device as claimed in claim 1, wherein the length of the cavity corresponds with the resonance frequency of the built-in woofer.
12. Loudspeaker device as claimed in claim 1, comprising two symmetrically placed woofers facing away from each other.
13. Loudspeaker device as claimed in claim 1, comprising a tweeter, for instance a dome tweeter, placed in the vicinity of the woofer.
14. Loudspeaker device as claimed in claim 13, wherein the woofer and the tweeter are in phase linear arrangement.
15. Loudspeaker device as claimed in claim 1, wherein the spaces are at least substantially mutually tangential with imaginary basic contour surfaces.
16. Loudspeaker device as claimed in claim 1, wherein the spaces mutually overlap over a distance which is a maximum of 1/5 x the diameter of a relevant space.
17. Loudspeaker device as claimed in claim 1, wherein all necks have substantially the same cross- sectional dimensions.
18. Loudspeaker device as claimed in claim 1, wherein the axis of symmetry has a form varying from a straight line, for instance a curved form.
19. Loudspeaker device as claimed in claim 1, wherein each space has a general shell shape.
20. Loudspeaker device as claimed in claim 1, wherein each space has a general cone shape.
21. Loudspeaker device as claimed in claim 1, wherein each space has a general parallelepiped shape.
*****
EP96904382A 1995-03-06 1996-03-06 Loudspeaker device Withdrawn EP0876740A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL9500440A NL9500440A (en) 1995-03-06 1995-03-06 Loudspeaker device.
NL9500440 1995-03-06
PCT/NL1996/000104 WO1996027999A1 (en) 1995-03-06 1996-03-06 Loudspeaker device

Publications (1)

Publication Number Publication Date
EP0876740A1 true EP0876740A1 (en) 1998-11-11

Family

ID=19865682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96904382A Withdrawn EP0876740A1 (en) 1995-03-06 1996-03-06 Loudspeaker device

Country Status (4)

Country Link
EP (1) EP0876740A1 (en)
AU (1) AU4850296A (en)
NL (1) NL9500440A (en)
WO (1) WO1996027999A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007895A1 (en) * 1980-03-01 1981-10-15 Hans-Jürgen 4000 Düsseldorf Lochbühler Multiple loudspeaker assembly for bass range - has high wooden frame with triangular or square cross-section
DE3213531A1 (en) * 1982-04-10 1983-10-20 Jens 2000 Hamburg Buckbesch Material for loudspeaker housings, sound guides and sound insulation
FR2615064A1 (en) * 1987-05-05 1988-11-10 Gremaud Herve Acoustic column with ground effect
US4953223A (en) * 1988-09-08 1990-08-28 Householder George G Speaker mounting system
US4964482A (en) * 1989-02-23 1990-10-23 Meyer John E Loudspeaker enclosure
FR2653630B1 (en) * 1989-10-23 1994-01-14 Di Carlo Gilles Scotto ACOUSTIC SPEAKER STRUCTURE.
GB2250157A (en) * 1990-11-15 1992-05-27 Stuart Victor Showell Loudspeaker enclosures
DE4131712C2 (en) * 1990-12-19 1994-12-08 Rainer Keplinger Speaker unit
DE4227696A1 (en) * 1992-08-21 1994-02-24 Reinhard Chemnitz Spherical loudspeaker housing consists of concrete - applied manually on inner surface of shape made of two half-shells, housing has irregular surface structure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9627999A1 *

Also Published As

Publication number Publication date
NL9500440A (en) 1996-10-01
AU4850296A (en) 1996-09-23
WO1996027999A1 (en) 1996-09-12

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