WO2004064444A2 - Audio speaker crossover having two or more filter housings - Google Patents
Audio speaker crossover having two or more filter housings Download PDFInfo
- Publication number
- WO2004064444A2 WO2004064444A2 PCT/US2004/000457 US2004000457W WO2004064444A2 WO 2004064444 A2 WO2004064444 A2 WO 2004064444A2 US 2004000457 W US2004000457 W US 2004000457W WO 2004064444 A2 WO2004064444 A2 WO 2004064444A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- assembly
- crossover
- tweeter
- housing
- Prior art date
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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
- H04R3/14—Cross-over networks
Definitions
- This invention relates to audio speaker systems and, more particularly, to an audio speaker crossover assembly having separable and dockable filter assemblies.
- Conventional audio speakers include a high frequency transducer known as a tweeter and a low frequency transducer known as a woofer.
- the signals which drive the tweeter and the woofer are derived from a single signal, such as an amplifier output signal.
- a tweeter driver signal and a woofer driver signal are derived from the amplifier output signal using an electronic component known as a crossover.
- the crossover includes a high pass filter, or tweeter filter, which filters the amplifier output signal to provide the tweeter driver signal and a low pass filter, or woofer filter, which filters the amplifier output signal to provide the woofer driver signal.
- the crossover In typical home speakers, the crossover is mounted in a housing such as a speaker cabinet or enclosure with a tweeter and a woofer. In other applications, spatial constraints make a single, relatively large housing undesirable. Accordingly, the crossover may be located in a housing that is separate from the tweeter and the woofer. For example, in vehicle applications, the spatial separation between a crossover and a tweeter and/or a woofer may be several feet.
- FIG. 1 is a schematic block diagram of an example of a prior art speaker 10 including an amplifier 11, a crossover 12 having a tweeter filter 22 and a woofer filter 24, a tweeter 13, and a woofer 14.
- Crossover 12 has an input port 26 for receiving an audio signal from amplifier 11, a tweeter output port 27 which provides a tweeter driver signal to tweeter 13 and a woofer output port 28 which provides a woofer driver signal to woofer 14.
- speaker 10 corresponds to one branch of a speaker system.
- a speaker system includes two or more branches, for example, left and right branches in both the front and the rear of the vehicle.
- Prior art speakers provide generally satisfactory performance. However, it is desirable to provide speakers wherein one or a few configurations can be utilized in multiple different vehicles and in other applications having spatial constraints. Accordingly, there is a need for improved crossover configurations.
- a crossover assembly for connection in an audio system including an amplifier and two or more transducers.
- the crossover assembly comprises a first filter assembly including a first filter mounted in a first housing, and a second filter assembly including a second filter mounted in a second housing.
- the first and second filter assemblies are mechanically dockable to form a single crossover unit and are mechanically separable to facilitate mounting in different locations.
- the first filter may comprise a tweeter filter
- the second filter may comprise a woofer filter.
- the first filter assembly may include a first mechanical connector
- the second filter assembly may include a second mechanical connector.
- the first and second mechanical connectors are interengageable for mechanical docking of the first and second filter assemblies and are disengageable for mechanical separation of the first and second filter assemblies.
- the first and second mechanical connectors may comprise snap-fit comiectors and may be integral components of the first and second housings, respectively.
- a crossover assembly is provided for connection in an audio system including an amplifier and two or more transducers.
- the crossover assembly comprises a tweeter filter assembly and a woofer filter assembly.
- the tweeter filter assembly includes a tweeter filter housing, a tweeter filter mounted in the tweeter filter housing, an input port, an output port and a first mechanical connector.
- the woofer filter assembly includes a woofer filter housing, a woofer filter mounted in the woofer filter housing, an input port, an output port and a second mechanical connector.
- the tweeter and woofer filter assemblies are dockable by interengaging the first and second mechanical connectors and are separable by disengaging the first and second mechanical connectors.
- a filter assembly for connection in an audio system including an amplifier and a transducer.
- the filter assembly comprises a filter housing including a mechanical connector, a single crossover filter mounted in the filter housing, an input port for connecting the crossover filter to the amplifier, and an output port for connecting the crossover filter to the transducer.
- the filter assembly is mechanically dockable to another filter assembly using the mechanical connector.
- FIG. 1 is a schematic block diagram of a prior art speaker
- FIG. 2 is a schematic block diagram of a speaker in accordance with an embodiment of the invention
- FIG. 3 is a perspective view of a crossover assembly in accordance with an embodiment of the invention, shown in the docked configuration
- FIG. 4 is a right-side perspective view of a filter assembly in accordance with an embodiment of the invention.
- FIG. 5 is a left-side perspective view of the filter assembly of FIG. 4. Detailed Description
- FIG. 2 A schematic block diagram of a speaker 100 according to an embodiment of the invention is shown in FIG. 2.
- Speaker 100 includes a tweeter 102, a woofer 104, and a crossover assembly 110. Tweeter 102 is connected to crossover assembly 110 by a cable 106, and woofer 104 is connected to crossover assembly 110 by a cable 108.
- Crossover assembly 110 includes a tweeter filter assembly 112 and a woofer filter assembly 114.
- Tweeter filter assembly 112 includes a tweeter filter housing 121 and a tweeter filter 122 mounted in tweeter filter housing 121. Tweeter filter assembly 112 further includes an input port 130, an output port 132 and an optional feedthrough port 134.
- Woofer filter assembly 114 includes a woofer filter housing 123 and a woofer filter 124 mounted in woofer filter housing 123.
- Woofer filter assembly 114 further includes an input port 140, an output port 142 and an optional feedthrough port 144.
- the input, output and feedthrough ports may be coaxial or twin-wire electrical connectors. However, any suitable electrical connections may be utilized. In the embodiment of FIG. 2, the input and feedthrough ports are located at one end of each filter housing and the output port is located at the opposite end of each filter housing. However, the invention is not limited in this respect, and the input, output and feedthrough ports may be located on any suitable surface of each housing.
- Tweeter filter assembly 112 further includes a mechanical connector 150
- woofer filter assembly 114 includes a mechanical connector 152.
- the mechanical connectors 150 and 152 are interengageable for mechanical docking of tweeter filter assembly 112 and woofer filter assembly 114.
- mechanical connector 150 may be a female connector
- mechanical connector 152 may be a male connector, or vice-versa.
- tweeter filter assembly 112 includes female mechanical connector 150 on one side of tweeter filter housing 121 and a male mechanical connector 154 on the opposite side of tweeter filter housing 121.
- woofer filter assembly 114 includes male mechanical connector 152 on one side of woofer filter housing 123 and a female mechanical connector 156 on the opposite side of woofer filter housing 123.
- Mechanical connectors 150, 152, 154, and 156 may be integral parts of the respective filter housings or may be individual mechanical connectors that are mounted to the respective housings. Mechanical connectors 150, 152, 154, and 156 permit the tweeter filter assembly 112 and the woofer filter assembly 114 to be docked, or mechanically connected, together to form a unitary, docked crossover configuration. In some applications, the unitary, docked configuration may be advantageous with respect to mounting. The mechanical connectors also permit tweeter filter assembly 112 and woofer filter assembly 114 to be separated to form a separated crossover configuration.
- crossover assembly 110 has a feature wherein tweeter filter assembly 112 and woofer filter assembly 114 are dockable to form the docked crossover configuration and are separable to form the separated crossover configuration, thereby providing a high degree of versatility and flexibility.
- woofer filter assembly 114 may be mounted on either side of tweeter filter assembly 112.
- additional filter assemblies may be mounted together in the docked configuration.
- a midrange filter assembly may be utilized to provide a crossover assembly having three or more filter assemblies. The three or more filter assemblies may be utilized in a docked configuration, a partially docked configuration (wherein at least two of the filter assemblies are docked together), or a separated configuration.
- Crossover assembly 110 may be connected to an amplifier 170 by a cable 172.
- amplifier 170 is illustrated as connected to tweeter filter assembly 112 and woofer filter assembly 114 by a single cable 172 having branches 172a and 172b, it will be understood that amplifier 170 may be connected to tweeter filter assembly 112 and woofer filter assembly 114 using any suitable electrical connection technique, including two separate cables.
- the term "cable” as used herein refers to any suitable electrical conduit, including but not limited to a coaxial cable, a twin-wire cable or separate electrical conductors. Branches 172a and 172b of cable 172 may be connected to input ports 130 and 140, respectively.
- Speaker 100 corresponds to one branch of a speaker system. Typically, a speaker system includes two or more branches.
- an additional speaker including a crossover assembly, a tweeter and a woofer, is used. While features and embodiments of the invention are discussed herein with reference to vehicle applications, the invention is not limited to vehicle applications and the principles of the invention may be utilized in any application in which a speaker is to be mounted.
- Tweeter filter housing 121 may be any suitable housing for mounting and operating a tweeter filter. Tweeter filter 122 may be mounted in tweeter filter housing i 121 using any suitable technique. The mounting technique may allow for removal of tweeter filter 122 without damage to tweeter filter 122 or tweeter filter housing 121. By way of example, tweeter filter 122 may be configured as a printed circuit board mounted on standoffs in tweeter filter housing 121.
- Tweeter filter housing 121 may be made of any suitable material, preferably a material which is sufficiently durable to withstand shock and vibration that may occur in a specific application, such as in a vehicle, but which is sufficiently flexible to permit mounting to non-flat surfaces. Tweeter filter housing 121 may be provided with flanges, screw holes and/or other elements to facilitate mounting. In some embodiments, tweeter filter 122 may be thermally coupled to tweeter filter housing 121 to provide heat sinking.
- a suitable material for making tweeter filter housing 121 is aluminum.
- Tweeter filter 122 receives the amplifier output signal from amplifier 170 via cable 172 and input port 130, and provides a filtered output signal to tweeter 102 via output port 132 and cable 106. Tweeter filter 122 may be any currently known or later-developed tweeter filter. As known in the art, tweeter filter 122 is configured to pass a high frequency portion of the audio frequency band. As noted above, tweeter filter assembly 112 may include feedthrough port 134. As shown in FIG. 2, input port 130 and feedthrough port 134 may be electrically connected within tweeter filter housing 121. Accordingly, feedthrough port 134 provides an unfiltered amplifier output signal. For example, feedthrough port 134 may be used to provide a daisy chain connection between tweeter filter assembly 112 and woofer filter assembly 114.
- a cable 174 is connected between feedthrough port 134 of tweeter filter assembly 112 and input port 140 of woofer filter assembly 114.
- branch 172a or branch 172b of cable 172 may be eliminated.
- cable 174 may be connected to feedthrough port 144 of woofer filter assembly 114.
- two or more tweeter filter assemblies can be daisy chained together using feedthrough port 134. A daisy chain connection may be advantageous to simplify wiring, particularly in applications where two or more filter assemblies are located relatively close together.
- Woofer filter assembly 114 may have a similar construction to tweeter filter assembly 112, except that woofer filter 124 is mounted in woofer filter housing 123. As known in the art, woofer filter 124 is configured to pass a low frequency portion of the audio frequency band. Woofer filter 124 receives the amplifier output signal from amplifier 170 via cable 172 and input port 140, and provides a filtered output signal to woofer 104 via output port 142 and cable 108. Tweeter filter housing 121 and woofer filter housing 123 may be the same or different in size and shape.
- tweeter filter assembly 112 and woofer filter assembly 114 are shown side-by-side.
- an aspect of the present invention is the ability to mount tweeter filter assembly 112 and woofer filter assembly 114 in any suitable locations, using the separated crossover configuration.
- tweeter filter assembly 112 and woofer filter assembly 114 may be mounted next to one another and attached together, in the docked crossover configuration.
- tweeter filter assembly 112 includes mechanical connectors 150 and 154
- woofer filter assembly 114 includes mechanical connectors 152 and 156 to facilitate the separable and dockable feature of the crossover assembly.
- Mechanical connectors 150, 152, 154, and 156 may be any suitable mechanical connectors for attaching tweeter filter assembly 112 and woofer filter assembly 114 together.
- the mechanical connectors may be snap-fit or press-fit connectors.
- the mechanical connectors may provide a rigid mechanical connection such that tweeter filter assembly 112 and woofer filter assembly 114 may be handled as a single unit during installation and mounting.
- a basic configuration includes a single mechanical connector on each of tweeter filter assembly 112 and woofer filter assembly 114, with the mechanical connectors being interengageable. Additional mechanical connectors may be added to each of tweeter filter assembly 112 and woofer filter assembly 114 to increase versatility of attachment.
- the mechanical connectors may include electrical contacts for electrically connecting tweeter filter assembly 112 and woofer filter assembly 114, in addition to mechanical connection.
- Tweeter filter assembly 112 may include vents 180 and 181 for cooling tweeter filter 122. Vents 180 and 181 may be located on opposite sides of tweeter filter housing 121 to permit cross flow of air. Woofer filter housing 123 may be provided with vents 182 and 183 for cooling woofer filter 124. Vents 182 and 183 may be located on opposite sides of woofer filter housing 123 to permit cross flow of air. Any suitable vent locations may be utilized, taking into consideration mechanical constraints and the expected mounting of the filter housings.
- FIG. 3 is a perspective view of crossover assembly 110 in the docked configuration.
- FIG. 4 is a right-side perspective view of tweeter filter assembly 112
- FIG. 5 is a left-side perspective view of tweeter filter assembly 112.
- tweeter filter assembly 112 and woofer filter assembly 114 may be electrically connected together by an electrical connector 310.
- electrical connector 310 is a rigid connector that connects feedthrough port 134 of tweeter filter assembly 112 to input port 140 of woofer filter assembly 114, such that tweeter filter 122 and woofer filter 124 are connected in parallel.
- electrical connector 310 provides a two- wire connection between tweeter filter assembly 112 and woofer filter assembly 114.
- screws 340 may be utilized for fastening wires to input port 130; screws 342 may be utilized for fastening wires to output port 132; and screws 344 may be utilized for fastening wires to feedthrough port 134.
- tweeter filter housing 121 may include female snap-fit connector 150 for mechanical connection to another housing, such as woofer filter housing 123. Tweeter filter housing 121 may further include male snap-fit connector 154 for connection to another filter housing (not shown in FIGS. 4 and 5).
- male mechanical connector 154 on tweeter filter housing 121 includes a trapezoidal projection having a beveled edge and female mechanical connector 150 includes a matching trapezoidal recess having a beveled edge that is complementary to the beveled edge on connector 154.
- Connector 150 further includes tabs or projections 190, and connector 154 further includes complementary slots 192.
- Connectors 156 and 152 on woofer filter housing 123 may have the same configuration as connectors 150 and 154, respectively, on tweeter filter housing 121.
- the trapezoidal projection slides into the trapezoidal recess, and tabs 190 snap into slots 192.
- the beveled edges of the trapezoidal projection and the trapezoidal recess prevent the filter housings from coming apart.
- Tweeter filter housing 121 may be provided with mounting brackets 320 and
- Woofer filter housing 123 may be provided with mounting brackets 330 and 332 for mechanically attaching woofer filter assembly 114 to a suitable surface, such as a surface of a vehicle.
- Mounting brackets 320, 322, 330 and 332 may be utilized for mounting of the respective filter assemblies in both the docked and separated configurations. It will be understood that other mounting bracket configurations may be utilized within the scope of the invention.
- vents 180, 181 may be implemented as a plurality of slots in tweeter filter housing 121.
- the slots permit crossflow of air across tweeter filter 122.
- Woofer filter housing 123 may have a similar configuration.
- tweeter filter housing 121 or woofer filter housing 123 may have approximate dimensions of 1.5 inches in height, 2.0 inches in width and 5.0 inches in length.
- a prior art crossover housing may have a width of about 3 inches. Accordingly, a single tweeter filter assembly or woofer filter assembly according to embodiments of the present invention may have a smaller footprint on a mounting surface than a prior art crossover housing.
- a tweeter filter assembly and a woofer filter assembly according to the present invention may be more conveniently located within a vehicle.
- the mounting options may allow a tweeter filter assembly to be mounted closer to the tweeter, and/or a woofer filter assembly to be mounted closer to the woofer. Accordingly, the length of the cable used to connect a tweeter filter assembly to a tweeter and/or to connect a woofer filter assembly to a woofer may be reduced. Such reduction in length may result in a reduction in electromagnetic interference on the tweeter driver signal and/or the woofer driver signal, and may reduce the impedance of the cables used to make the connections. The reduced interference and reduced impedance may improve the sound characteristics of the tweeter and/or the woofer. Accordingly, crossover assemblies according to embodiments of the present invention provide a designer with options that may allow specific performance goals to be met.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04701165A EP1582085A2 (en) | 2003-01-09 | 2004-01-09 | Audio speaker crossover having two or more filter housings |
BR0406679-0A BRPI0406679A (en) | 2003-01-09 | 2004-01-09 | Audio speaker crossover having two or more filter housings |
GB0514858A GB2412813B (en) | 2003-01-09 | 2004-01-09 | Audio speaker crossover having two or more filter housings |
CA002512880A CA2512880A1 (en) | 2003-01-09 | 2004-01-09 | Audio speaker crossover having two or more filter housings |
JP2006500863A JP4441601B2 (en) | 2003-01-09 | 2004-01-09 | Audio speaker crossover with two or more filter housings |
IL169595A IL169595A (en) | 2003-01-09 | 2005-07-07 | Audio speaker crossover having two or more filter housings |
HK06104013A HK1083166A1 (en) | 2003-01-09 | 2006-03-31 | Audio speaker crossover having two or more filter housings |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US43885103P | 2003-01-09 | 2003-01-09 | |
US60/438,851 | 2003-01-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004064444A2 true WO2004064444A2 (en) | 2004-07-29 |
WO2004064444A3 WO2004064444A3 (en) | 2004-09-16 |
Family
ID=32713391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/000457 WO2004064444A2 (en) | 2003-01-09 | 2004-01-09 | Audio speaker crossover having two or more filter housings |
Country Status (10)
Country | Link |
---|---|
US (1) | US20050053247A1 (en) |
EP (1) | EP1582085A2 (en) |
JP (1) | JP4441601B2 (en) |
CN (1) | CN1751536A (en) |
BR (1) | BRPI0406679A (en) |
CA (1) | CA2512880A1 (en) |
GB (1) | GB2412813B (en) |
HK (1) | HK1083166A1 (en) |
IL (1) | IL169595A (en) |
WO (1) | WO2004064444A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103618980A (en) * | 2013-11-26 | 2014-03-05 | 广州天逸电子有限公司 | Electronic acoustic splitter |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7925307B2 (en) * | 2006-10-31 | 2011-04-12 | Palm, Inc. | Audio output using multiple speakers |
DE112008003305B4 (en) * | 2008-01-31 | 2015-02-19 | Mitsubishi Electric Corp. | Band-splitting time compensation signal processing device |
GB2477295B (en) * | 2010-01-28 | 2013-10-02 | Gp Acoustics Uk Ltd | Loudspeaker system |
EP3550852B8 (en) * | 2014-02-14 | 2021-03-24 | Sonion Nederland B.V. | A joiner for a receiver assembly |
JP5668233B1 (en) * | 2014-03-26 | 2015-02-12 | 株式会社サウンドファン | Universal speaker |
CN104023296A (en) * | 2014-06-19 | 2014-09-03 | 深圳市中兴移动通信有限公司 | Sound output method and device and mobile terminal |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4282402A (en) * | 1979-04-23 | 1981-08-04 | Liontonia Harry D | Design of crossover network for high fidelity speaker system |
US5677961A (en) * | 1995-06-08 | 1997-10-14 | Von Reusner; Johannes | Connecting element for speaker elements |
DE19740366C1 (en) * | 1997-09-13 | 1998-06-25 | Reusner Johannes Von | Frequency separating filter module system for loudspeaker box |
US5797768A (en) * | 1996-08-05 | 1998-08-25 | Senior Industries, Inc. | Electrical connector and system for automatic insertion machinery |
EP1115178A2 (en) * | 2000-01-07 | 2001-07-11 | F.C.I. - Framatome Connectors International | Connector for a cable and kit for assembling the same |
Family Cites Families (11)
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US2841648A (en) * | 1955-08-08 | 1958-07-01 | Electro Voice | Sound producing device |
US4154979A (en) * | 1977-07-05 | 1979-05-15 | Bose Corporation | Woofer efficiency |
US4597100A (en) * | 1984-05-15 | 1986-06-24 | Rg Dynamics, Inc. | Ultra high resolution loudspeaker system |
US5530770A (en) * | 1994-04-11 | 1996-06-25 | Kim; Man H. | Multiple output transformers network for sound reproducing system |
KR960018792U (en) * | 1994-11-07 | 1996-06-19 | 김만호 | Speaker connector of sound reproduction system |
US5533135A (en) * | 1995-04-10 | 1996-07-02 | Gary; Phillip A. | Crossover system |
JPH1186980A (en) * | 1997-09-02 | 1999-03-30 | Canon Inc | Connector |
US6675931B2 (en) * | 1998-11-30 | 2004-01-13 | Joseph Yaacoub Sahyoun | Low profile audio speaker |
US7016513B2 (en) * | 2000-03-20 | 2006-03-21 | Outline S.N.C. Di Noselli G.& C. | Variable disposition wide band multi-way loudspeakers |
US20020014369A1 (en) * | 2000-07-31 | 2002-02-07 | Mark Engebretson | System for integrating mid-range and high frequency acoustic sources in multi-way loudspeakers |
TWM246931U (en) * | 2003-12-03 | 2004-10-11 | Sekaku Electron Industry Co Lt | Sound box and its stacked assembling structure |
-
2004
- 2004-01-09 CA CA002512880A patent/CA2512880A1/en not_active Abandoned
- 2004-01-09 WO PCT/US2004/000457 patent/WO2004064444A2/en active Application Filing
- 2004-01-09 JP JP2006500863A patent/JP4441601B2/en not_active Expired - Fee Related
- 2004-01-09 GB GB0514858A patent/GB2412813B/en not_active Expired - Fee Related
- 2004-01-09 EP EP04701165A patent/EP1582085A2/en not_active Withdrawn
- 2004-01-09 CN CNA2004800044485A patent/CN1751536A/en active Pending
- 2004-01-09 US US10/754,469 patent/US20050053247A1/en not_active Abandoned
- 2004-01-09 BR BR0406679-0A patent/BRPI0406679A/en not_active IP Right Cessation
-
2005
- 2005-07-07 IL IL169595A patent/IL169595A/en not_active IP Right Cessation
-
2006
- 2006-03-31 HK HK06104013A patent/HK1083166A1/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4282402A (en) * | 1979-04-23 | 1981-08-04 | Liontonia Harry D | Design of crossover network for high fidelity speaker system |
US5677961A (en) * | 1995-06-08 | 1997-10-14 | Von Reusner; Johannes | Connecting element for speaker elements |
US5797768A (en) * | 1996-08-05 | 1998-08-25 | Senior Industries, Inc. | Electrical connector and system for automatic insertion machinery |
DE19740366C1 (en) * | 1997-09-13 | 1998-06-25 | Reusner Johannes Von | Frequency separating filter module system for loudspeaker box |
EP1115178A2 (en) * | 2000-01-07 | 2001-07-11 | F.C.I. - Framatome Connectors International | Connector for a cable and kit for assembling the same |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 1999, no. 08, 30 June 1999 (1999-06-30) -& JP 11 086980 A (CANON INC), 30 March 1999 (1999-03-30) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103618980A (en) * | 2013-11-26 | 2014-03-05 | 广州天逸电子有限公司 | Electronic acoustic splitter |
Also Published As
Publication number | Publication date |
---|---|
BRPI0406679A (en) | 2005-12-20 |
GB2412813A (en) | 2005-10-05 |
IL169595A (en) | 2009-11-18 |
GB2412813B (en) | 2006-06-21 |
HK1083166A1 (en) | 2006-06-23 |
US20050053247A1 (en) | 2005-03-10 |
JP2006515974A (en) | 2006-06-08 |
GB0514858D0 (en) | 2005-08-24 |
WO2004064444A3 (en) | 2004-09-16 |
JP4441601B2 (en) | 2010-03-31 |
IL169595A0 (en) | 2007-07-04 |
CN1751536A (en) | 2006-03-22 |
EP1582085A2 (en) | 2005-10-05 |
CA2512880A1 (en) | 2004-07-29 |
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