NL2011074C2 - Sound speaker grill arrangement and sound speaker comprising such grill arrangement. - Google Patents

Sound speaker grill arrangement and sound speaker comprising such grill arrangement. Download PDF

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Publication number
NL2011074C2
NL2011074C2 NL2011074A NL2011074A NL2011074C2 NL 2011074 C2 NL2011074 C2 NL 2011074C2 NL 2011074 A NL2011074 A NL 2011074A NL 2011074 A NL2011074 A NL 2011074A NL 2011074 C2 NL2011074 C2 NL 2011074C2
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Netherlands
Prior art keywords
grid
plates
loudspeaker
range
grill
Prior art date
Application number
NL2011074A
Other languages
Dutch (nl)
Inventor
Gerardus Wilhelmus Johannes Beuningen
Original Assignee
Duran Audio B V
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.)
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Publication date
Application filed by Duran Audio B V filed Critical Duran Audio B V
Priority to NL2011074A priority Critical patent/NL2011074C2/en
Application granted granted Critical
Publication of NL2011074C2 publication Critical patent/NL2011074C2/en

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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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/023—Screens for loudspeakers
    • 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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Description

Sound speaker grill arrangement and sound speaker comprising such grill arrangement FIELD OF THE INVENTION
The invention relates to a sound speaker grill arrangement and to a sound speaker comprising a sound source; a sound exiting surface area arranged for exiting sound provided by the sound source; and the sound speaker grill arrangement arranged over the sound exiting surface. The sound speaker grill arrangement is constructed such as to allow transmission of sound provided by the sound source.
BACKGROUND OF THE INVENTION
Sound speakers are generally known, for instance, from WO 2003/069952 A, and are widely used in various applications. One of these applications concerns public address and voice alarm systems. This can be in industrial environments with a high ambient noise level. One such environment can be, for instance, a road tunnel. Grills for sound speakers are generally known as well, and may provide some level of protection of the sound speaker.
Sound speakers, and other devices, that are applied in these industrial or road environments usually require a high degree of enclosure protection. One of the requirements concerns protection against water ingress into the devices. Water ingress requirements in industrial environments, including road tunnels, etcetera, are prescribed in the IPX5 (‘water jetting’) and the more strict IPX6 (‘powerful water jetting’) standards. Especially sound speakers are vulnerable to water ingress since they have an open sound exiting surface. Known grill arrangements do nor or hardly provide any protection against water ingress, especially not against water jetting.
Water easily gets into the known sound speakers, which will cause malfunction or complete breakdown of the sound speakers. A good and reliable functioning of sound speakers in public address and voice alarm systems is highly required in these industrial and road/traffic applications for safety reasons.
SUMMARY OF THE INVENTION
It is an objective of the invention to provide a sound speaker grill arrangement and a sound speaker which provide a high degree of enclosure protection.
It is another or alternative objective of the invention to provide a sound speaker grill arrangement and a sound speaker that is highly resistant to water ingress.
It is yet another or alternative objective of the invention to provide a sound speaker that is very reliable in a wet environment.
It is yet another or alternative objective of the invention to provide a sound speaker grill arrangement of which acoustical properties can be optimized, especially in a selected frequency interval.
At least one of the above objectives of the invention is achieved by a sound speaker grill arrangement constructed for arrangement over a sound exiting surface of a sound speaker and constructed such as to allow transmission of sound provided by a sound source of the sound speaker, the grill arrangement comprising two or more grill plates provided with grill openings, the grill plates being arranged essentially parallel to one another at a mutual distance between adjacent grill plates.
In another aspect the invention provides a sound speaker comprising a sound source; a sound exiting surface area arranged for exiting sound provided by the sound source; and the above grill arrangement arranged over the sound exiting surface.
The two or more perforated grill plates that are arranged more or less parallel prevent the ingress of water into the sound speaker, while still passing sound from the sound source to the outside of the speaker. The grill plates need not be exactly parallel. The distance in between the plates may vary to some degree along the grill plates. Two grill plates may proof sufficient in applications.
In embodiments of the invention each grill opening has an open surface area in the range of 0.03 to 3.2 mm2, in an embodiment in the range of 0.1 to 1.8 mm2, in an embodiment in the range of 0.2 to 1.2 mm2. The grill openings may have various shapes. In other and further embodiments the grill openings have a diameter in the range of 0.2 to 2 mm, in an embodiment in the range of 0.4 to 1.5 mm, in an embodiment in the range of 0.5 to 1.2 mm. The open surface area and/or diameter of the grill openings finds an optimum in these ranges, which may further depend on specific application and circumstances. If the open surface area and/or diameter is too large, the ingress water flow reduction is not sufficient. If the open surface area or diameter is too small the openings may get clogged or provide a too high acoustical impedance. The acoustical impedance is a combination of both the acoustical resistance and acoustical reactance.
In other and further embodiments of the invention the grill plates have a porosity in the range of 10% to 50%, in an embodiment in the range of 15% to 40%, in an embodiment in the range of 20% to 30%. A porosity in these ranges provides an optimum between on the one hand sufficient pressure loss of the ingress water flow and on the other hand acoustical impedance.
In other and further embodiments the grill plates have a thickness in the range of 0.2 to 2 mm, in an embodiment in the range of 0.3 to 1.5 mm, which ranges proof efficient in resistance against water ingress and acoustical impedance.
In preferred embodiments the mutual distance between adjacent grill plates is in the range of 2 to 40 mm, in an embodiment in the range of 3 to 25 mm, in an embodiment in the range of 3 to 15 mm, in an embodiment in the range of of 4 to 11 mm. These ranges show to provide an optimum. If the mutual distances are too small the acoustic damping strongly depends on the alignment of the hole patterns between the grill plates, at larger distances this becomes less critical. Also at smaller distances the total damping of the grill plates may be larger than the sum of the damping of individual plates. On the other hand, if the mutual distance becomes too large dip and peak frequencies in the sound transmission profile of the grill arrangement become very dominant. Also diffraction effects at the edges of the grill arrangement can deteriorate the sound profile at larger mutual distances between grill plates. The distance between the plates need not be a distance fixed in the actual embodiment, but may also be made automatically or manually controllable.
Efficiently, the grill plates comprise plastic or metal plates, in an embodiment steel plates, in an embodiment stainless steel plates. These materials show to have good properties as a grill material.
In preferred embodiments of the invention the mutual distance between adjacent grill plates is non-equidistant (not a constant) in a direction substantially parallel to the grill plates. The distance between the grill plates may vary in a direction substantially parallel to the grill plates. Interference effects between the grill plates are further reduced by having a non-equidistant mutual distance along the plates. Any interference pattern is spread over a frequency range and therefore hardly present.
In an embodiment that is efficiently manufactured the mutual distance between adjacent grill plates decreases from a central position of the grill plates towards edges of the grill plates. In an embodiment one or more of the grill plates comprises a convex or concave shape.
Advantageously, edges of the grill plates are mounted in a frame, which efficiently imposes a mutual distance between the grill plates at the edge regions and helps in reducing grill plate vibrations. Preferably, the frame comprises a resilient material, in an embodiment rubber, which further assists in reducing vibrations and provides an easy mounting of the grill plates in a frame.
In a further advantageous embodiment, one or more spacer elements are mounted between adjacent grill plates, in an embodiment the one or more spacer elements are mounted at a central position between the grill plates, which efficiently imposes a mutual distance between grill plates at the central position. In an efficient embodiment the grill plates and the spacer element comprise steel, in an embodiment stainless steel, the spacer element being welded to one or both of the adjacent grill plates.
In an embodiment the grill openings are substantially aligned to achieve a minimum sound resistance.
In another embodiment the sound speaker comprises a horn arrangement of which a cross-sectional surface area increases from a relatively narrow end towards an open and relatively wide end, the sound source being arranged at the narrow end and the grill arrangement being provided over the open wide end.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages of the invention will become apparent by a description of the invention by way of non-limiting and non-exclusive embodiments. Embodiments of the invention will be described with reference to the accompanying drawings, in which like or same reference symbols denote like, same or corresponding parts, and in which
Figure 1 shows a perspective view on a sound speaker and sound speaker grill arrangement according to the invention;
Figure 2 shows a cross-section along the sound speaker and sound speaker grill arrangement of figure 1;
Figure 3 shows a cross-section of the grill arrangement of the previous figure in more detail;
Figure 3a shows a grill frame shown in figure 3 in more detail;
Figure 3b is a schematic view of the cross-section of the grill arrangement of figure 3;
Figure 4 shows a front view of a grill plate; and
Figure 5 shows another embodiment of a sound speaker with grill arrangement according to the invention.
DETAILED DESCRIPTION OF EMBODIMENTS A sound speaker 1 is shown in figures 1 and 2 in an embodiment having a horn arrangement or horn part 30. The horn part 30 has a relatively narrow end 31 and a relatively wide end 32. A cross-sectional surface area of the horn part 30 increases in a direction from the narrow end 31 towards the wide end 32. A sound source 20 is arranged at the narrow end of the horn part and closes off the narrow part. Sound produced by the sound source 20 travels through the horn arrangement 30 towards the wide end 32, which is open so the sound can exit from the sound speaker. The open end 32 provides a sound exiting surface 2 of the sound speaker 1. Such an embodiment of a sound speaker is disclosed in more detail in WO 2003/069952 A, which disclosure is incorporated herein by reference. A grill arrangement 10 is provided over the sound exiting surface 2 of the open end 32 of the horn arrangement 30. The grill arrangement 10 allows the transmission of sound, and also acts as a barrier to contaminants and water. The grill arrangement 10 is mounted in a manner onto the sound speaker 1, which is known as such. The grill arrangement can be dismounted for access to the sound speaker, or replacement or cleaning of the grill arrangement.
The grill arrangement is shown in more detail in figures 3, 3a and 3b, and comprises two grill plates 11, 12 in the embodiment shown. In other embodiments the grill arrangement may comprise more than two grill plates. The grill plates 11, 12 are mounted in a rubber frame 13 such that the edges of the grill plates are fixed in position in internal grooves 13.1 in the grill frame 13. The frame is generally manufactured from a resilient material, but may comprise a plastic or any other suitable material as well. At a bottom position the grill frame can be provided with drainage holes to allow water that has entered in between the grill plates to drain to the outside. The grill plates are mounted essentially parallel at a mutual distance d from one another in the grill frame. A front view of the grill plates 11, 12 is shown in figure 4. The grill plates each have a large number of grill openings 15, which are shown as round openings in the embodiment disclosed. The grill openings may have any shape, for example a square or rectangular shape. Round openings are easy to make. The diameter of the grill openings or grill holes is 0.8 mm in the depicted embodiment, but may generally be in the range of 0.2 to 2 mm, in an embodiment in the range of 0.4 to 1.5 mm, in another embodiment in the range of 0.5 to 1.2 mm. The open surface area of the grill openings may generally be in the range of 0.03 to 3.2 mm2, in an embodiment in the range of 0.1 to 1.8 mm2, in another embodiment in the range of 0.2 to 1.2 mm2. Grill hole pitch and grill plate porosity is 1.4 mm and 26% in the enclosed embodiment. The porosity of the grill plates may generally be in the range of 10% to 50%, in an embodiment in the range of 15% to 40%, in another embodiment in the range of 20% to 30%. A thickness of the grill plates may generally be in the range of 0.2 to 2 mm, in an embodiment in the range of 0.3 to 1.5 mm, and is 0.5 mm in the embodiment depicted. The grill opening diameter, grill opening surface area, porosity and grill plate thickness of actual embodiments may be selected in dependence of various circumstances and design choices. The ranges disclosed prove to work very well.
The grill plates 11, 12 may be positioned exactly parallel, but this will results in pronounced interference effects. It is therefore preferred that the plates are arranged such that a mutual distance between the plates is non-equidistant in a direction A along the grill plates. This schematically shown in figure 3b, in which it is shown that a distance dl at a central position between the grill plates 11, 12 is larger than a distance d2 towards the edges between the grill plates. One of the grill plates has a convex shape and the other one has a concave shape such that the widest distance d between the grill plates is at a central position between the plates. The concave and convex grill plates could also have been positioned such that the smallest distance between the plates is at a central position between the plates and the widest distance at the edges of the plates. Any other configuration providing a non-equidistant distance between the grill plates in a direction along the grill plates will work as well.
Figure 3 further shows a spacer element 14 at a central position between the grill plates 11, 12. The spacer element 14 at this central position together with the fixation of the edges of the grill plates in the grill frame 13 provides for the convex and concave shapes of the grill plates. More than one spacer element 14 may also be employed. The grill plates are further positioned such that the grill openings are substantially aligned to provide optimal sound transmission. In other embodiments one may choose to have less alignment to provide an increased barrier against water ingress.
The grill plates can be made of any suitable material, such as a plastic or a metal like aluminum or steel. In the embodiment disclosed the grill plates and also the spacer element are made from stainless steel. The stainless steel spacer element 14 is welded to one of the stainless steel grill plates 11, 12 to fix it in position. Grill plates and spacer elements of a plastic can be joined together by a glue.
The distance between the grill plates varies between 5 mm at the edges to 10 mm at the central position of the grill plates 11, 12. A distance in the range of 5 to 10 mm between the grill plates shows good results for sound transmission. It provides an optimum distance range in that respect, also for plates that are arranged completely parallel, but distances between the grill plates in the range of 2 to 40 mm, in embodiments in the range of 3 to 25 mm, in further embodiments in the range of 3 to 15 mm and in other embodiments in the range of 4 to 11 mm work as well.
The various available parameters like shape of grill openings, open area of the grill openings, porosity of the grill plates, thickness of the grill plates, distance between the grill plates, curvature and distance profile between the grill plates, etcetera allow to optimize the grill arrangement to have a minimum acoustical damping in a certain frequency range.
Figure 5 shows another embodiment of a sound speaker. The embodiment of figure 5 has sound sources or speaker units 20 mounted in a rectangular shaped box 40. A sound exiting surface 2 of the sound speaker is also covered with a grill frame as disclosed above.
Various other embodiments of the invention will be apparent to the skilled person when having read the above disclosure in connection with the drawings, all of which are within the scope of the invention and accompanying claims.

Claims (18)

1. Een luidsprekerroostervoorziening (10) geconstrueerd om aan te brengen over een geluidsverlatend oppervlak (2) van een luidspreker (1) en geconstrueerd om transmissie van geluid verschaft door een geluidsbron (20) van de luidspreker mogelijk te maken, welke roostervoorziening omvat twee of meer roosterplaten (11, 12) voorzien van roosteropeningen (15), welke roosterplaten in hoofdzaak evenwijdig aan elkaar zijn aangebracht op een onderlinge afstand (d) tussen naastgelegen roosterplaten.A loudspeaker raster (10) constructed to fit over a sound-leaving surface (2) of a loudspeaker (1) and constructed to allow transmission of sound provided by a sound source (20) of the loudspeaker, which roster comprises two or more grid plates (11, 12) provided with grid openings (15), which grid plates are arranged substantially parallel to each other at a mutual distance (d) between adjacent grid plates. 2. De luidsprekerroostervoorziening volgens conclusie 1, waarbij elke roosteropening (15) een open oppervlaktegebied heeft in het bereik van 0,03 tot 3,2 mm2, in een uitvoeringsvorm in het bereik van 0,1 tot 1,8 mm2, in een uitvoeringsvorm in het bereik van 0,2 tot 1,2 mm2.The loudspeaker grid arrangement according to claim 1, wherein each grid opening (15) has an open surface area in the range of 0.03 to 3.2 mm 2, in an embodiment in the range of 0.1 to 1.8 mm 2, in an embodiment in the range of 0.2 to 1.2 mm 2. 3. De luidsprekerroostervoorziening volgens conclusie 1 of 2, waarbij de roosteropeningen (15) een diameter hebben in het bereik van 0,2 tot 2 mm, in een uitvoeringsvorm in het bereik van 0,4 tot 1,5 mm, in een uitvoeringsvorm in het bereik van 0,5 tot 1,2 mm.The loudspeaker grid arrangement according to claim 1 or 2, wherein the grid openings (15) have a diameter in the range of 0.2 to 2 mm, in an embodiment in the range of 0.4 to 1.5 mm, in an embodiment in the range of 0.5 to 1.2 mm. 4. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij de roosterplaten (11, 12) een poreusiteit hebben in het bereik van 10% tot 50%, in een uitvoeringsvorm in het bereik van 15% tot 40%, in een uitvoeringsvorm in het bereik van 20% tot 30%.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein the grid plates (11, 12) have a porosity in the range of 10% to 50%, in an embodiment in the range of 15% to 40%, in an embodiment in the range of 20% to 30%. 5. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij de roosterplaten (11, 12) een dikte hebben in het bereik van 0,2 tot 2 mm, in een uitvoeringsvorm in het bereik van 0,3 tot 1,5 mm.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein the grid plates (11, 12) have a thickness in the range of 0.2 to 2 mm, in an embodiment in the range of 0.3 to 1.5 mm . 6. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij de onderlinge afstand (d) tussen naastliggende roosterplaten (11, 12) is in het bereik van 2 tot 40 mm, in een uitvoeringsvorm in het bereik van 3 tot 25 mm, in een uitvoeringsvorm in het bereik van 3 tot 15 mm, in een uitvoeringsvorm in het bereik van 4 tot 11 mm.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein the mutual distance (d) between adjacent grid plates (11, 12) is in the range of 2 to 40 mm, in an embodiment in the range of 3 to 25 mm, in an embodiment in the range of 3 to 15 mm, in an embodiment in the range of 4 to 11 mm. 7. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij de roosterplaten (11, 12) kunststof of metaal platen omvatten, in een uitvoeringsvorm staal platen, in een uitvoeringsvorm roestvast staal platen.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein the grid plates (11, 12) comprise plastic or metal plates, in one embodiment steel plates, in one embodiment stainless steel plates. 8. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij de onderlinge afstand (d) tussen naastliggende roosterplaten (11, 12) niet-equidistant is in een richting hoofdzakelijk evenwijdig aan de roosterplaten.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein the mutual distance (d) between adjacent grid plates (11, 12) is non-equidistant in a direction substantially parallel to the grid plates. 9. De luidsprekerroostervoorziening volgens de voorgaande conclusie, waarbij de onderlinge afstand (d) tussen naastliggende roosterplaten (11, 12) afneemt vanaf een centrale positie van de roosterplaten naar randen van de roosterplaten.The loudspeaker grid arrangement according to the preceding claim, wherein the mutual distance (d) between adjacent grid plates (11, 12) decreases from a central position of the grid plates to edges of the grid plates. 10. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij een of meer van de roosterplaten (11, 12) een convexe of concave vorm omvatten.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein one or more of the grid plates (11, 12) comprise a convex or concave shape. 11. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij randen van de roosterplaten (11, 12) in een roosterframe (13) zijn gemonteerd.The loudspeaker grid arrangement according to one or more of the preceding claims, wherein edges of the grid plates (11, 12) are mounted in a grid frame (13). 12. De luidsprekerroostervoorziening volgens een de voorgaande conclusie, waarbij het roosterframe (13) een veerkrachtig materiaal omvat, in een uitvoeringsvorm rubber.The loudspeaker grid arrangement according to any preceding claim, wherein the grid frame (13) comprises a resilient material, in one embodiment rubber. 13. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij een of meer spacerelementen (14) zijn gemonteerd tussen naastgelegen roosterplaten (11, 12).The loudspeaker grid arrangement according to one or more of the preceding claims, wherein one or more spacer elements (14) are mounted between adjacent grid plates (11, 12). 14. De luidsprekerroostervoorziening volgens de voorgaande conclusies, waarbij een of meer spacerelementen (14) zijn gemonteerd op een centrale positie tussen naastgelegen roosterplaten (11, 12).The loudspeaker grid arrangement according to the preceding claims, wherein one or more spacer elements (14) are mounted at a central position between adjacent grid plates (11, 12). 15. De luidsprekerroostervoorziening volgens conclusie 13 of 14, waarbij de roosterplaten (11, 12) en het/de spacerelement(en) staal omvatten, in een uitvoeringsvorm roestvast staal, en het/de spacerelement(en) aan een of beide van de naastgelegen roosterplaten zijn gelast.The loudspeaker grid arrangement according to claim 13 or 14, wherein the grid plates (11, 12) and the spacer element (s) comprise steel, in one embodiment stainless steel, and the spacer element (s) on one or both of the adjacent grid plates are welded. 16. De luidsprekerroostervoorziening volgens een of meer van de voorgaande conclusies, waarbij de roosteropeningen in hoofdzaak zijn uitgelijnd.The loudspeaker grid arrangement as claimed in one or more of the preceding claims, wherein the grid openings are substantially aligned. 17. Een luidspreker (1) omvattende een geluidsbron (20); een geluidsverlatend oppervlaktegebied (2) voorzien voor het uitstralen van geluid verschaft door de geluidsbron; en de roostervoorziening (10) volgens een of meer van de voorgaande conclusies, welke roostervoorziening is aangebracht over het geluidsverlatend oppervlak.A speaker (1) comprising a sound source (20); a sound-leaving surface area (2) provided for radiating sound provided by the sound source; and the grid arrangement (10) according to one or more of the preceding claims, which grid arrangement is arranged over the sound-leaving surface. 18. De luidspreker volgens de voorgaande conclusie, waarbij de luidspreker (1) omvat een hoomvoorziening (30) waarvan een dwarsdoorsnede-oppervlaktegebied toeneemt vanaf een relatief nauw uiteinde (31) naar een open en relatief wijd uiteinde (32), de geluidsbron is aangebracht bij het nauwe uiteinde, en de roostervoorziening (10) is aangebracht over het open wijde uiteinde (32).The loudspeaker according to the preceding claim, wherein the loudspeaker (1) comprises a hoom arrangement (30) of which a cross-sectional area increases from a relatively narrow end (31) to an open and relatively wide end (32), the sound source being arranged at the narrow end, and the grid arrangement (10) is arranged over the open wide end (32).
NL2011074A 2013-07-01 2013-07-01 Sound speaker grill arrangement and sound speaker comprising such grill arrangement. NL2011074C2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016106045A1 (en) * 2016-04-01 2017-10-05 ic audio GmbH PA facility

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB660807A (en) * 1948-09-10 1951-11-14 Leonard Young Improvements in and relating to loudspeakers
DE2404943A1 (en) * 1974-02-01 1975-08-07 Siemens Ag Electroacoustical transducer - has plate in sound path protecting it from spray water
US20100270102A1 (en) * 2009-04-22 2010-10-28 Chad Banter Splash Proof Acoustically Resistive Color Assembly
US20120321121A1 (en) * 2011-05-30 2012-12-20 Harman Becker Automotive Systems Gmbh Loudspeaker grille

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB660807A (en) * 1948-09-10 1951-11-14 Leonard Young Improvements in and relating to loudspeakers
DE2404943A1 (en) * 1974-02-01 1975-08-07 Siemens Ag Electroacoustical transducer - has plate in sound path protecting it from spray water
US20100270102A1 (en) * 2009-04-22 2010-10-28 Chad Banter Splash Proof Acoustically Resistive Color Assembly
US20120321121A1 (en) * 2011-05-30 2012-12-20 Harman Becker Automotive Systems Gmbh Loudspeaker grille

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016106045A1 (en) * 2016-04-01 2017-10-05 ic audio GmbH PA facility

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