US3142353A - Speaker enclosure - Google Patents

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US3142353A
US3142353A US232955A US23295562A US3142353A US 3142353 A US3142353 A US 3142353A US 232955 A US232955 A US 232955A US 23295562 A US23295562 A US 23295562A US 3142353 A US3142353 A US 3142353A
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sound
speaker
horns
horn
enclosure
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Carmine V Todisco
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    • 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
    • H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material 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
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure

Definitions

  • This invention relates to a loud speaker enclosure assembly for sound reproduction purposes. It is a primary object of the present invention to provide a speaker enclosure in combination with a single electro dynamically driven speaker capable of reproducing sound within the entire audible range of frequencies including the lower bass frequencies.
  • Another object of the present invention is to provide a speaker enclosure for a single speaker, the enclosure being of the bass reflex type yet approaching an enclosure of a loaded horn by utilizing a gang of exponential horns replacing the ports normally associated with a bass reflex enclosure, the volume of the enclosure also being reduced below that of a bass reflex sound chamber designed in accordance with the piston area and characteristic of the single speaker and the lowest frequency it is capable of reproducing.
  • the important discovery of the present invention is the fact that a plurality of exponential horns that are geometrically similar and reduced in scale with respect to a single equivalent horn, may reproduce sound with the same tone or quality as the single equivalent horn designed for a particular speaker enclosure to obtain optimum sound reproduction and hence in accordance with the type, ratings and dimensions of the single speaker with which the plurality of horns are associated and the rearwardly loading sound chamber.
  • a tremendous reduction in the size of the enclosure is effected compared to the size that would be necessary to support a full sized rear loaded exponential horn.
  • the foregoing division and addition of sound is also accomplished without any sacrifice in acoustical efliciency.
  • FIGURE 1 is a perspective view of one form of speaker enclosure in accordance with the principles of the present invention.
  • FIGURE 2 is a side sectional view of the speaker enclosure taken through a plane indicated by section line 2-2 in FIGURE 1.
  • FIGURE 3 is another form of speaker enclosure constructed in accordance with the principles of the present invention.
  • FIGURE 4 is a sectional view taken substantially through a plane indicated by section line 44 in FIG- URE 3.
  • FIGURE 5 is a third form of a speaker enclosure constructed in accordance with the principles of the present invention.
  • FIGURE 6 is a sectional view taken substantially through a plane indicated by section line 6-6 in FIG- URE 5.
  • a speaker enclosure assembly generally referred to by reference numeral 10 includes an outer cabinet made of any suitable material such as plywood, including a top 12, a bottom 14, side 16 and a closed back panel 18.
  • a partition member 20 is mounted within the enclosure more closely spaced to the rear panel 18 than the open front which is generally referred to by reference numeral 22.
  • a centrally located rectangular opening is formed in the partition member 20 to which a speaker box 24 is connected, the box 24 being opened rearwardly thereof and having an opening 26 in a front panel 28, in which there is supported a speaker generally referred to by reference numeral 30.
  • the speaker 30 is of the electro dynamic type and capable of handling the audible range of frequencies.
  • the speaker 30 includes a rearwardly tapering cone 32 from which the sound energy is radiated, the cone being driven by the power driven component 34 mounted rearwardly thereon.
  • the cone 32 is rear loaded so that the higher frequencies of sound energy while directly radiated in a forward direction at a relatively high energy level as indicated by the arrows 36 will not so emerge from the rear chamber.
  • the lower frequencies of sound energy on the other hand, will be radiated in a rearward direction as indicated by the arrows 38 for reinforcement purposes.
  • the rearwardly directed lower frequency energy, radiated from the speaker cone 32, will therefore enter the reflex sound chamber including the chamber 40 formed rearwardly of the partition member 20.
  • the sound chamber 40 is lined with a sound absorbing material 42 such as felt padding whereby only the lower frequency sound will be propagated in a forward direction through a plurality of ports 44 formed in the partition member 24).
  • the sound chamber 40 constitutes a bass reflex enclosure.
  • a rear loading bass reflex chamber when exposed to atmospheric pressure through forward radiating outlet ports, must enclose a predetermined mass of air to attain transmission of the desired low frequency sound energy with a relatively low compression of the air.
  • the volume of the chamber 40 is substantially less than the limit prescribed for such bass reflex sound chamber in accordance with the present invention.
  • the volume of the sound chamber 40 is reduced in favor of an increase in pressure in the chamber allowed to expand through a horn passage outlet.
  • the chamber volurne is therefore selected in accordance with different criteria involving the throat area of a full sized exponential horn or a single equivalent horn designed in accordance with the size of the speaker, the mass of its piston and magnet, the flux density thereof, and resonant frequency of the speaker and the desired lowest or cut-off frequency capable of being reproduced.
  • a plurality of geometrically similar exponential horns 46 are utilized to thereby significantly reduce the size of the enclosure that would otherwise be necessary to support and mount a single full sized horn or one designed in accordance with the aforementioned criteria.
  • the throat end 48 of each of the horns is accordingly fitted within the ports 44 in the partition member 20, the ports 44 and the horns being spaced with respect to each other so as to accommodate the enlarged mouth ends 50 of the horns.
  • each of the horns 46 will be of equal reduced scale with respect to the single equivalent horn, the scale or dimensional reduction ratio being equal to the number of horns found to be most efficient in connection with the type of speaker being utilized. It has been found, that the scale most efficient for a 12-inch diameter speaker is between 32 and 38. It should however be appreciated that the optimum scale for other size speakers will differ and that the dimensional restrictions referred to are mere- 1y exemplary.
  • the horns 46 are arranged in a pattern about the centrally disposed speaker box 24. It will be appreciated however, that other arrangements of the plurality of horns with respect to the single speaker, may be adopted such as illustrated in FIGURES 3 and 4.
  • the speaker enclosure assembly 52 illustrated in FIGURES 3 and 4 therefore includes two groups of exponential horns 54 and 56 disposed on either side of the speaker box 58 and disposed at a slight rearward angle thereto in order to increase the range of the speaker.
  • two speaker boxes 60 and 62 are arranged on opposite sides of a. plurality of horns 64 including a number sufficient to accommodate each of the speaker boxes in accordance with the principles of the invention as described with respect to FIG- URES 1 and 2.
  • the speaker enclosure assembly 66 generally referred to by reference numeral 66 includes a partition member 68 which separates the enclosure into two sound chambers 7 0 and 72 respectively associated with a group of horns 64 and one of the speaker boxes with speaker mounted therein.
  • the speaker enclosure assembly 66 is thereby rendered ideally suited for stereo reproduction.
  • the speaker enclosure may be constructed in accordance with the principles of the present invention capable of reproducing the sound of a true full sizer horn and within a physical space substantially smaller than that ordinarily associated with such a full sized horn.
  • the speaker enclosure is capable of operating at a higher efficiency because of better loading of the speaker and the utilization of both front and rear radiated acoustical power.
  • the enclosure assembly also facilitates the dispersion of the sound and constitutes a better coupling of the high pressure acoustical power produced by the speaker with the low pressure of the atmosphere.
  • a plurality of horns may faithfully reproduce the attributes of a true full scaled exponential born when certain conditions are met. These conditions, include the use of a plurality of horns which are geometrically similar to the single equivalent horn, having length and passage areas, the sums of which are equal to the corresponding length and passage area of the single equivalent horn. Also, the volume of the sound chamber must be in proportion to the determined area of the throat of the full sized equivalent horn for equivalent rear loading thereof for reproducing the lower bass frequencies of the sound energy radiated from the speaker.
  • the dimensions of the full scale equivalent exponential horn will be designed in accordance with the size of the speaker, the mass of its piston, its magnet weight, its gauss rating, its resonent frequency and the desired lowest cut off frequency.
  • a sound reproducing device comprising, power driven means, sound radiating means mounting said power driven means and responsive to energization thereof for effecting direct radiation of sound energy in a forward direction, reflex chamber means mounted rearwardly of said radiating means for conducting rearwardly directed sound energy from said sound radiating means, said chamber means having a volume substantially equal to the volume occupied by a mass of air that would be displaced by the radiating means for propagation of sound energy through a single equivalent rear loaded exponential horn having a certain length, throat and mouth areas designed for optimum sound reproduction with said reflex chamber means, and a plurality of dimensionally reduced exponential horns forming outlet passages from said chamber means forwardly directing said sound energy conducted through said chamber means, said plurality of horns being geometrically similar to said single equivalent horn and having lengths, throat and mouth areas the sums of which respectively equal said certain length, throat and mouth areas of the single equivalent horn.
  • an acoustical enclosure comprising, a front panel mounting said speaker for directly radiating sound energy forwardly therefrom, side walls extending rearwardly from the front panel beyond the speaker, a partition member mounted between said side walls rearwardly of the speaker forming an opening aligned with the speaker through which sound energy is adapted to be radiated rearwardly for propagation through an equivalent full-sized exponential horn having certain dimensions designed to reinforce bass frequencies of the sound energy radiated from the speaker, a back panel connected to said side walls for enclosing a sound chamber rearwardly of the speaker defining a volume designed for said propagation of the sound energy radiated rearwardly from the speaker, and a plurality of smaller exponential horns extending forwardly from the partition member to the front panel for forwardly conducting sound energy radiated rearwardly from the speaker through the sound chamber, each of said smaller horns having dimensions reduced from said certain dimensions of the fullsized horn in proportion to the number of said pluralit

Description

United States Patent 3,142,353 SPEAKER ENCLOSURE Carmine V. Todiseo, 100 Augusta Drive, North Syracuse 12, NY. Filed Oct. 25, 1962, Ser. No. 232,955 4 Claims. (Cl. 181-31) This invention relates to a loud speaker enclosure assembly for sound reproduction purposes. It is a primary object of the present invention to provide a speaker enclosure in combination with a single electro dynamically driven speaker capable of reproducing sound within the entire audible range of frequencies including the lower bass frequencies.
Another object of the present invention is to provide a speaker enclosure for a single speaker, the enclosure being of the bass reflex type yet approaching an enclosure of a loaded horn by utilizing a gang of exponential horns replacing the ports normally associated with a bass reflex enclosure, the volume of the enclosure also being reduced below that of a bass reflex sound chamber designed in accordance with the piston area and characteristic of the single speaker and the lowest frequency it is capable of reproducing.
The important discovery of the present invention, is the fact that a plurality of exponential horns that are geometrically similar and reduced in scale with respect to a single equivalent horn, may reproduce sound with the same tone or quality as the single equivalent horn designed for a particular speaker enclosure to obtain optimum sound reproduction and hence in accordance with the type, ratings and dimensions of the single speaker with which the plurality of horns are associated and the rearwardly loading sound chamber. As a result thereof, a tremendous reduction in the size of the enclosure is effected compared to the size that would be necessary to support a full sized rear loaded exponential horn. The foregoing division and addition of sound is also accomplished without any sacrifice in acoustical efliciency.
These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:
FIGURE 1 is a perspective view of one form of speaker enclosure in accordance with the principles of the present invention.
FIGURE 2 is a side sectional view of the speaker enclosure taken through a plane indicated by section line 2-2 in FIGURE 1.
FIGURE 3 is another form of speaker enclosure constructed in accordance with the principles of the present invention.
FIGURE 4 is a sectional view taken substantially through a plane indicated by section line 44 in FIG- URE 3.
FIGURE 5 is a third form of a speaker enclosure constructed in accordance with the principles of the present invention.
FIGURE 6 is a sectional view taken substantially through a plane indicated by section line 6-6 in FIG- URE 5.
Referring now to the drawings in detail, it will be observed from FIGURES 1 and 2, that a speaker enclosure assembly generally referred to by reference numeral 10 includes an outer cabinet made of any suitable material such as plywood, including a top 12, a bottom 14, side 16 and a closed back panel 18. A partition member 20 is mounted within the enclosure more closely spaced to the rear panel 18 than the open front which is generally referred to by reference numeral 22. A centrally located rectangular opening is formed in the partition member 20 to which a speaker box 24 is connected, the box 24 being opened rearwardly thereof and having an opening 26 in a front panel 28, in which there is supported a speaker generally referred to by reference numeral 30. The speaker 30 is of the electro dynamic type and capable of handling the audible range of frequencies. As illustrated in FIG- URE 2, the speaker 30 includes a rearwardly tapering cone 32 from which the sound energy is radiated, the cone being driven by the power driven component 34 mounted rearwardly thereon. The cone 32 is rear loaded so that the higher frequencies of sound energy while directly radiated in a forward direction at a relatively high energy level as indicated by the arrows 36 will not so emerge from the rear chamber. The lower frequencies of sound energy on the other hand, will be radiated in a rearward direction as indicated by the arrows 38 for reinforcement purposes.
The rearwardly directed lower frequency energy, radiated from the speaker cone 32, will therefore enter the reflex sound chamber including the chamber 40 formed rearwardly of the partition member 20. Accordingly, the sound chamber 40 is lined with a sound absorbing material 42 such as felt padding whereby only the lower frequency sound will be propagated in a forward direction through a plurality of ports 44 formed in the partition member 24). In this sense, the sound chamber 40 constitutes a bass reflex enclosure. In this regard, a rear loading bass reflex chamber when exposed to atmospheric pressure through forward radiating outlet ports, must enclose a predetermined mass of air to attain transmission of the desired low frequency sound energy with a relatively low compression of the air. However, the volume of the chamber 40 is substantially less than the limit prescribed for such bass reflex sound chamber in accordance with the present invention. Instead, the volume of the sound chamber 40 is reduced in favor of an increase in pressure in the chamber allowed to expand through a horn passage outlet. The chamber volurne is therefore selected in accordance with different criteria involving the throat area of a full sized exponential horn or a single equivalent horn designed in accordance with the size of the speaker, the mass of its piston and magnet, the flux density thereof, and resonant frequency of the speaker and the desired lowest or cut-off frequency capable of being reproduced. However, instead of using the single equivalent rear loaded horn for which the volume of the sound chamber 40 is designed, a plurality of geometrically similar exponential horns 46 are utilized to thereby significantly reduce the size of the enclosure that would otherwise be necessary to support and mount a single full sized horn or one designed in accordance with the aforementioned criteria. The throat end 48 of each of the horns is accordingly fitted within the ports 44 in the partition member 20, the ports 44 and the horns being spaced with respect to each other so as to accommodate the enlarged mouth ends 50 of the horns. The number of horns 46 selected will be such that the total length of all of the horns will equal the length of the referred to single equivalent horn, the total throat areas of all of the horns will equal the throat area of the single equivalent horn and the total mouth areas of the horns will equal the mouth area of the single horn. Accordingly, each of the horns 46, will be of equal reduced scale with respect to the single equivalent horn, the scale or dimensional reduction ratio being equal to the number of horns found to be most efficient in connection with the type of speaker being utilized. It has been found, that the scale most efficient for a 12-inch diameter speaker is between 32 and 38. It should however be appreciated that the optimum scale for other size speakers will differ and that the dimensional restrictions referred to are mere- 1y exemplary. In this manner, it has been found that the rearwardly reflected sound energy at the lower frequencies, is conducted through the horns 46 in a forward direction emerging in phase with the direct radiation from the speaker 30 and adding up to the lower frequency characteristics of the sound energy originating from the speaker.
It will be observed, from FIGURE 1, that the horns 46 are arranged in a pattern about the centrally disposed speaker box 24. It will be appreciated however, that other arrangements of the plurality of horns with respect to the single speaker, may be adopted such as illustrated in FIGURES 3 and 4. The speaker enclosure assembly 52 illustrated in FIGURES 3 and 4 therefore includes two groups of exponential horns 54 and 56 disposed on either side of the speaker box 58 and disposed at a slight rearward angle thereto in order to increase the range of the speaker. In FIGURES 5 and 6, two speaker boxes 60 and 62 are arranged on opposite sides of a. plurality of horns 64 including a number sufficient to accommodate each of the speaker boxes in accordance with the principles of the invention as described with respect to FIG- URES 1 and 2. Accordingly, as more clearly seen in FIGURE 6, the speaker enclosure assembly generally referred to by reference numeral 66 includes a partition member 68 which separates the enclosure into two sound chambers 7 0 and 72 respectively associated with a group of horns 64 and one of the speaker boxes with speaker mounted therein. The speaker enclosure assembly 66 is thereby rendered ideally suited for stereo reproduction.
From the foregoing description, it will be apparent that the speaker enclosure may be constructed in accordance with the principles of the present invention capable of reproducing the sound of a true full sizer horn and within a physical space substantially smaller than that ordinarily associated with such a full sized horn.. Also, the speaker enclosure is capable of operating at a higher efficiency because of better loading of the speaker and the utilization of both front and rear radiated acoustical power. The enclosure assembly also facilitates the dispersion of the sound and constitutes a better coupling of the high pressure acoustical power produced by the speaker with the low pressure of the atmosphere.
It will also be observed, that despite the reduced size of the enclosure, there is little, if any, sacrifice of horn size because of physical restrictions, to thereby effect a true reproduction of the low bass frequency depending on the cut off frequency for which the single exponential horn is designed which is equivalent to the plurality of horns actually utilized. Also, all of the horns are mounted on straight axes so as to avoid the frictional acoustical losses characteristic of folded horn arrangements.
Utilizing the constructional principles for the speaker enclosure as hereinbefore described, it has been discovered that a plurality of horns may faithfully reproduce the attributes of a true full scaled exponential born when certain conditions are met. These conditions, include the use of a plurality of horns which are geometrically similar to the single equivalent horn, having length and passage areas, the sums of which are equal to the corresponding length and passage area of the single equivalent horn. Also, the volume of the sound chamber must be in proportion to the determined area of the throat of the full sized equivalent horn for equivalent rear loading thereof for reproducing the lower bass frequencies of the sound energy radiated from the speaker. Accordingly, the dimensions of the full scale equivalent exponential horn will be designed in accordance with the size of the speaker, the mass of its piston, its magnet weight, its gauss rating, its resonent frequency and the desired lowest cut off frequency. Finally, it has been discovered that as a result of the foregoing constructional principles in connection with the design of a speaker enclosure, the lower frequency energy components can be divided, phased and passed through the horns and allowed to expand at a pre-determined mathematical rate so as to emerge at the same low pressure side of the speaker enclosure, recombining to produce the original low frequency as originally radiated by the speaker.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as desired.
What is claimed as new is as follows:
1. A sound reproducing device comprising, power driven means, sound radiating means mounting said power driven means and responsive to energization thereof for effecting direct radiation of sound energy in a forward direction, reflex chamber means mounted rearwardly of said radiating means for conducting rearwardly directed sound energy from said sound radiating means, said chamber means having a volume substantially equal to the volume occupied by a mass of air that would be displaced by the radiating means for propagation of sound energy through a single equivalent rear loaded exponential horn having a certain length, throat and mouth areas designed for optimum sound reproduction with said reflex chamber means, and a plurality of dimensionally reduced exponential horns forming outlet passages from said chamber means forwardly directing said sound energy conducted through said chamber means, said plurality of horns being geometrically similar to said single equivalent horn and having lengths, throat and mouth areas the sums of which respectively equal said certain length, throat and mouth areas of the single equivalent horn.
2. In combination with a speaker radiating sound energy forwardly and rearwardly therefrom, an acoustical enclosure comprising, a front panel mounting said speaker for directly radiating sound energy forwardly therefrom, side walls extending rearwardly from the front panel beyond the speaker, a partition member mounted between said side walls rearwardly of the speaker forming an opening aligned with the speaker through which sound energy is adapted to be radiated rearwardly for propagation through an equivalent full-sized exponential horn having certain dimensions designed to reinforce bass frequencies of the sound energy radiated from the speaker, a back panel connected to said side walls for enclosing a sound chamber rearwardly of the speaker defining a volume designed for said propagation of the sound energy radiated rearwardly from the speaker, and a plurality of smaller exponential horns extending forwardly from the partition member to the front panel for forwardly conducting sound energy radiated rearwardly from the speaker through the sound chamber, each of said smaller horns having dimensions reduced from said certain dimensions of the fullsized horn in proportion to the number of said plurality of smaller horns.
3. The combination of claim 1, wherein said plurality ofhhorns are mounted in adjacent parallel relation to each 0t er.
4. The combination of claim 1, wherein the number of said plurality of horns is between 32 and 38 for use when associated with a sound radiating cone of 12-inch diameter.
References Cited in the file of this patent UNITED STATES PATENTS 1,869,178 Thuras July 26, 1932 2,971,598 Sieler Feb. 14, 1961 3,047,090 Pruden July 31, 1962 FOREIGN PATENTS 384,973 Great Britain Mar. 6, 1931 484,704 Great Britain May 9, 1938

Claims (1)

1. A SOUND REPRODUCING DEVICE COMPRISING, POWER DRIVEN MEANS, SOUND RADIATING MEANS MOUNTING SAID POWER DRIVEN MEANS AND RESPONSIVE TO ENERGIZATION THEREOF FOR EFFECTING DIRECT RADIATION OF SOUND ENERGY IN A FORWARD DIRECTION, REFLEX CHAMBER MEANS MOUNTED REARWARDLY OF SAID RADIATING MEANS FOR CONDUCTING REARWARDLY DIRECTED SOUND ENERGY FROM SAID SOUND RADIATING MEANS, SAID CHAMBER MEANS HAVING A VOLUME SUBSTANTIALLY EQUAL TO THE VOLUME OCCUPIED BY A MASS OF AIR THAT WOULD BE DISPLACED BY THE RADIATING MEANS FOR PROPAGATION OF SOUND ENERGY THROUGH A SINGLE EQUIVALENT REAR LOADED EXPONENTIAL HORN HAVING A CERTAIN LENGTH, THROAT AND MOUTH AREAS DESIGNED FOR OPTIMUM SOUND REPRODUCTION WITH SAID REFLEX CHAMBER MEANS, AND A PLURALITY OF DIMENSIONALLY REDUCED EXPONEN-
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203502A (en) * 1964-04-28 1965-08-31 Marjorie M Rife Corner speaker enclosure
US3247926A (en) * 1964-09-14 1966-04-26 Edwin G Warman Loud-speaker enclosure
US3342498A (en) * 1965-05-13 1967-09-19 Newcomb Electronics Corp Portable phonograph
US3777844A (en) * 1972-10-24 1973-12-11 R Johnson Adjustable speaker cabinet
FR2305086A1 (en) * 1975-03-10 1976-10-15 Monitron Ind ACOUSTIC SPEAKER
DE2839111A1 (en) * 1977-09-15 1979-03-29 Novanex Automation Nv SPEAKER SYSTEM
US4280585A (en) * 1979-08-27 1981-07-28 Motoyoshi Nakanishi Multi-sound speaker system
US4398619A (en) * 1981-04-02 1983-08-16 Daniel Ronald L S Loudspeaker cabinet
US4635748A (en) * 1986-02-18 1987-01-13 Paulson Rollie W Speaker cabinet having interactive speakers
EP0489551A2 (en) * 1990-12-03 1992-06-10 Bose Corporation Loudspeaker system having multiple subchambers
US5436977A (en) * 1993-02-19 1995-07-25 Sony Corporation Speaker system
US5696357A (en) * 1995-08-25 1997-12-09 Polk Investment Corporation Bass-reflex loudspeaker
US5714721A (en) * 1990-12-03 1998-02-03 Bose Corporation Porting
US5844176A (en) * 1996-09-19 1998-12-01 Clark; Steven Speaker enclosure having parallel porting channels for mid-range and bass speakers
WO2000069213A2 (en) * 1999-05-07 2000-11-16 Gsbs Development Corporation Sounders for fire alarm systems
US8064627B2 (en) 2007-10-22 2011-11-22 David Maeshiba Acoustic system
US9241207B2 (en) * 2012-08-25 2016-01-19 Goertek Inc. Speaker module
USD769215S1 (en) * 2014-07-15 2016-10-18 Funktion One Research Loudspeaker
USD780158S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
USD780159S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
US10932039B2 (en) * 2018-11-19 2021-02-23 Aac Acoustic Technologies (Shenzhen) Co., Ltd. Speaker box

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Publication number Priority date Publication date Assignee Title
US1869178A (en) * 1930-08-15 1932-07-26 Bell Telephone Labor Inc Sound translating device
GB384973A (en) * 1930-04-02 1932-12-15 Pilade Fabbri Improvements in the emission of sounds by radiophonic receiving apparatus and talking machines
GB484704A (en) * 1936-10-07 1938-05-09 Robert Rodger Glen Improvements in or relating to loudspeakers and the like
US2971598A (en) * 1956-08-23 1961-02-14 Sieler George Jerome Loud speaker
US3047090A (en) * 1958-05-07 1962-07-31 Robert G Pruden Tuned acoustical device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB384973A (en) * 1930-04-02 1932-12-15 Pilade Fabbri Improvements in the emission of sounds by radiophonic receiving apparatus and talking machines
US1869178A (en) * 1930-08-15 1932-07-26 Bell Telephone Labor Inc Sound translating device
GB484704A (en) * 1936-10-07 1938-05-09 Robert Rodger Glen Improvements in or relating to loudspeakers and the like
US2971598A (en) * 1956-08-23 1961-02-14 Sieler George Jerome Loud speaker
US3047090A (en) * 1958-05-07 1962-07-31 Robert G Pruden Tuned acoustical device

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203502A (en) * 1964-04-28 1965-08-31 Marjorie M Rife Corner speaker enclosure
US3247926A (en) * 1964-09-14 1966-04-26 Edwin G Warman Loud-speaker enclosure
US3342498A (en) * 1965-05-13 1967-09-19 Newcomb Electronics Corp Portable phonograph
US3777844A (en) * 1972-10-24 1973-12-11 R Johnson Adjustable speaker cabinet
FR2305086A1 (en) * 1975-03-10 1976-10-15 Monitron Ind ACOUSTIC SPEAKER
DE2839111A1 (en) * 1977-09-15 1979-03-29 Novanex Automation Nv SPEAKER SYSTEM
US4280585A (en) * 1979-08-27 1981-07-28 Motoyoshi Nakanishi Multi-sound speaker system
US4398619A (en) * 1981-04-02 1983-08-16 Daniel Ronald L S Loudspeaker cabinet
US4635748A (en) * 1986-02-18 1987-01-13 Paulson Rollie W Speaker cabinet having interactive speakers
EP0489551A2 (en) * 1990-12-03 1992-06-10 Bose Corporation Loudspeaker system having multiple subchambers
EP0489551A3 (en) * 1990-12-03 1993-04-14 Bose Corporation Loudspeaker system having multiple subchambers
US5714721A (en) * 1990-12-03 1998-02-03 Bose Corporation Porting
US5436977A (en) * 1993-02-19 1995-07-25 Sony Corporation Speaker system
US5696357A (en) * 1995-08-25 1997-12-09 Polk Investment Corporation Bass-reflex loudspeaker
US5844176A (en) * 1996-09-19 1998-12-01 Clark; Steven Speaker enclosure having parallel porting channels for mid-range and bass speakers
WO2000069213A2 (en) * 1999-05-07 2000-11-16 Gsbs Development Corporation Sounders for fire alarm systems
WO2000069213A3 (en) * 1999-05-07 2001-07-26 Gsbs Dev Corp Sounders for fire alarm systems
US6905001B1 (en) 1999-05-07 2005-06-14 Gsbs Development Corporation Sounders for fire alarm systems
US8064627B2 (en) 2007-10-22 2011-11-22 David Maeshiba Acoustic system
US20120061174A1 (en) * 2007-10-22 2012-03-15 David Maeshiba Acoustic system
US9241207B2 (en) * 2012-08-25 2016-01-19 Goertek Inc. Speaker module
USD769215S1 (en) * 2014-07-15 2016-10-18 Funktion One Research Loudspeaker
USD780158S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
USD780159S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
US10932039B2 (en) * 2018-11-19 2021-02-23 Aac Acoustic Technologies (Shenzhen) Co., Ltd. Speaker box

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