US2751997A - Low frequency horn - Google Patents
Low frequency horn Download PDFInfo
- Publication number
- US2751997A US2751997A US447943A US44794354A US2751997A US 2751997 A US2751997 A US 2751997A US 447943 A US447943 A US 447943A US 44794354 A US44794354 A US 44794354A US 2751997 A US2751997 A US 2751997A
- Authority
- US
- United States
- Prior art keywords
- cabinet
- horn
- wall
- upper edge
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010276 construction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2861—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn
- H04R1/2865—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn for loudspeaker transducers
Definitions
- the taper or rate of flare of the horn should be such that the propagation of low frequencies through the horn is accomplished easily. For good low-frequency reproduction, the taper should be very gradual. Second, the mouth area of the horn must be adequate to prevent resonances in the air column of the horn if smooth response is to be realized.
- the horn is of the folded type to achieve the desired length in a minimum of space, it is relatively expensive to construct and the large mouth area generally makes the unit too large for home use.
- the horn to minimize its size, must be located at a particular position in a room, such as in a corner so that it relies on the side walls and floor as an extension of the horn mouth to increase its effective area, its utility is necessarily limited, as in many cases there is no corner available for the unit, due to structural or decorative considerations.
- the horn tapers outwardly exponentially from its throat so as to substantially double its area per discrete increment of length and is designed so that sound waves will be emitted from the front and from both sides of the cabinet in which it is contained.
- the floor in front and on each side of the cabinet, as well as the portion of the wall against which the cabinet is placed on each side of the latter will serve as extensions of the horn mouth to increase the eifective area thereof, thereby permitting a gradually tapered horn of minimum length and size with high fidelity reproduction of low frequency sound waves.
- Fig. 1 is a perspective view of the cabinet horn
- Fig. 2 is a sectional view taken along line 2-2 of Fig. 1,
- Fig. 3 is a front elevational view of the unit with parts broken away
- Fig. 4 is a fragmentary view similar to Fig. 2 of another embodiment.
- the unit comprises a cabinet 11 illustratively rectangular as shown, having a front wall 12, a rear wall 13, side walls 14 and 15, a floor 16 and a top wall 17.
- the front wall 12 and side walls 14 and 15 adjacent their lower edges 18 each has a rectangular opening 19, 20 and 21 therethrough extending substantially the width of the associated Wall and defining the mouth of the horn.
- bafile structure 22 Positioned in the cabinet 11 is a bafile structure 22 which is substantially a pyramid bisected along a plane perpendicular to its base and extending through its vertex.
- the baffle structure is illustratively formed from two side panels 23 and 24 in the form of right triangles having two legs 26 and 27 and a hypotenuse 28 and a front panel 29 in the form of an isosceles triangle having a base 31 and two legs 32 and 33.
- each of the side panels 23, 24 is aflfixed to the floor 16 of the cabinet adjacent the lower edge 13 of each of its side walls 14 and 15 respectively and the panels 23, 24 are inclined toward each other with their upper apices meeting as at 34 and with their legs 27 affixed to the back wall 13 of the cabinet.
- the front panel 29 has its base 31 affixed to the floor 16 of the cabinet adjacent the lower edge 18 of its front wall 12 and the opposed legs 32 and 33 off front panel 29 are afiixcd to the adjacent hypotenuse 23. of panels 23 and 24 respectively with the apex of panel 29 meeting the junction 3 of the apices of panels 23 and 24.
- baffle member 36 illustratively a substantially rectangular panel affixed at its lower edge 37 to the front wall 12 immediately above the upper edge 33 of opening 19.
- the panel 36 is inclined toward front panel 29 of the ba'i'fie structure 22 with its upper edge 39 lying in substantially the same horizontal plane as the apices of panels 23, 24 and 25 and spaced therefrom.
- a rectangular baffle panel 42 which also extends between side walls 14 and 15 and is inclined toward the back wall 13, the area between the upper edge 43 of panel 42 and the back wall 13 and side walls 14 and 15 defining the throat of the horn.
- a speaker 44 is mounted on front wall 12 behind an opening 45 therein with the concave side of the speaker facing toward the opening 45 so that high frequency notes will be radiated directly into the room.
- the panels 36 and 42 together with the baflle structure 22 and the back wall 13 and side walls 14, 15 of the cabinet form the horn and the dimensions and angles of inclination of the various elements are selected so that from the throat T to the mouth of the horn the rate of taper will be such that the cross sectional area of the horn will double for each increment of length based on the cut off frequency desired.
- the dimensions are selected so that the eifective mouth area which is the sum of the actual mouth area defined by openings 19, 20 and 21 plus the extensions of such mouth caused by the effect of the floor in front and on the sides of the cabinet and the portion of the wall against which the cabinet is placed on each side of the latter, will be equal to the required mouth area, for high fidelity response at the desired cut off frequency.
- the mouth area of the horn should equal ap proximately the area of a circle whose diameter is 1/11 times the wavelength of the lowest frequency to be reproduced and the rate of taper or the distance in which the sectional area doubles expressed in feet is equal to 62.5 frequency in cycles per second
- the formulas for determining the desired mouth area and the rate of taper for a given out oif frequency are well known in the acoustic art, they will not be discussed.
- a baffle plate 46 extending between the side walls 14 and 15 may have its lower edge 47 affixed to back wall 13 and its upper edge 48 aff xed to top wall 17.
- An associated baflle plate 49 also extending between side walls 14 and 15 may have its lower edge 51 aflixed to the upper edge 43 of bathe plate 42 and its upper edge 52 spaced from the top wall 17.
- the bathe plates 46 and 49 which define therebetween a continuation of the passageway between baffle plate 42 and rear wall 13 and baffle plate 36 and battle structure 22, are so positioned in the cabinet that the sectional area of the combined passageway will increase exponentially from one end to the other.
- the length of the horn may be a minimum even with the required rate of taper for the low cut off frequency desired.
- the horn may be relatively compact in size, suitable for home use and as it may be positioned against any portion of the wall of a room its usefulness is enhanced.
- bafile structure has a front panel and two side panels, each of the side panels being a right triangle having one leg against the back wall, a second leg against the floor and its hypotenuse extending from the back wall to the front wall, and the front panel is an isosceles triangle having its base against the floor and its legs against the hypotenuse of each of the side panels.
- bafile structure has a front panel and two side panels, each of the side panels being a right triangle having one leg against the back wall, a second leg against the floor and its hypotenuse extending from the back wall to the front wall, and the front panel is an isosceles triangle having its base against thefloor and its legs against the hypotenuse of each of the side panels, the upper apices of said three panels lying in substantially the same horizontal plane as the upper edge of the baflle plate.
- each of said openings extends substantially the entire width of the associated wall.
- a horn for use with a loud speaker unit comprising a substantially rectangular cabinet having a floor, a top wall, front and back walls and side walls, a baflle structure in said cabinet comprising a front panel and two side panels, each of the side panels being a right triangle having one leg against the back wall, a second leg against the floor adjacent the side walls respectively and its hypotenuse extending from the back wall to the front wall, the front panel being an isosceles triangle having its base against the floor adjacent the front wall and its legs against the hypotenuse of each of the side panels, the upper apices of each of said three panels meeting at a point against the back wall substantially midway between the side walls of the cabinet, said front and side walls each having an opening therethrough adjacent the floor of the cabinet extending substantially the width of the associated wall and defining the mouth of the horn, an inclined baffle plate in said cabinet extending from one side wall to the other, having its lower edge aligned with the upper edge of the opening in the front panel and its upper edge lying in substantially the same horizontal plane
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Description
Juhe26,l956
E. J. GATELY, JR
LOW FREQUENCY HORN Filed Aug. 5, 1954 INVENTOR EdwardJGazefqh QTTORN EYS United States Patent LOW FREQUENCY HORN Edward J. Gately, Jr., Drexel Hill, Pa. Application August 5, 1954, Serial No. 447,943
11 Claims. (Cl. 181-31) This invention relates to the art of acoustic devices and more particularly to horns to be used in conjunction with loud speaker units for amplifying low frequency sound waves.
As conducive to an understanding of the invention, it is noted that to have true reproduction of low frequency audio sound waves, two factors essentially govern the success of a horn operated at such low frequencies. First, the taper or rate of flare of the horn should be such that the propagation of low frequencies through the horn is accomplished easily. For good low-frequency reproduction, the taper should be very gradual. Second, the mouth area of the horn must be adequate to prevent resonances in the air column of the horn if smooth response is to be realized.
Consequently, where the horn, to have such gradual taper and large mouth area, is made of relatively great length, because of the bulk and size of the horn it is undesirable, especially for home use where the size and esthetic eifect of the unit are important factors.
Where the horn is of the folded type to achieve the desired length in a minimum of space, it is relatively expensive to construct and the large mouth area generally makes the unit too large for home use.
Where the horn, to minimize its size, must be located at a particular position in a room, such as in a corner so that it relies on the side walls and floor as an extension of the horn mouth to increase its effective area, its utility is necessarily limited, as in many cases there is no corner available for the unit, due to structural or decorative considerations.
It is accordingly among the objects of the invention to provide a combined cabinet horn which is made from relatively inexpensive components which may readily be assembled at low cost, which is compact in size yet provides the desired gradual taper and effective mouth area for high fidelity reproduction of low frequency sound Waves regardless of the portion of the wall of a room against which it is positioned.
According to the invention from its broader aspect, the horn tapers outwardly exponentially from its throat so as to substantially double its area per discrete increment of length and is designed so that sound waves will be emitted from the front and from both sides of the cabinet in which it is contained. Thus when the cabinet is positioned against the wall of a room, the floor in front and on each side of the cabinet, as well as the portion of the wall against which the cabinet is placed on each side of the latter will serve as extensions of the horn mouth to increase the eifective area thereof, thereby permitting a gradually tapered horn of minimum length and size with high fidelity reproduction of low frequency sound waves.
In the accompanying drawings in which are shown one or more of various possible embodiments of the several features of the invention,
Fig. 1 is a perspective view of the cabinet horn,
Fig. 2 is a sectional view taken along line 2-2 of Fig. 1,
Fig. 3 is a front elevational view of the unit with parts broken away, and
Fig. 4 is a fragmentary view similar to Fig. 2 of another embodiment.
Referring now to Figs. 1 to 3 of the drawings, in the embodiment shown to illustrate the invention, the unit comprises a cabinet 11 illustratively rectangular as shown, having a front wall 12, a rear wall 13, side walls 14 and 15, a floor 16 and a top wall 17.
The front wall 12 and side walls 14 and 15 adjacent their lower edges 18 each has a rectangular opening 19, 20 and 21 therethrough extending substantially the width of the associated Wall and defining the mouth of the horn.
Positioned in the cabinet 11 is a bafile structure 22 which is substantially a pyramid bisected along a plane perpendicular to its base and extending through its vertex. The baffle structure is illustratively formed from two side panels 23 and 24 in the form of right triangles having two legs 26 and 27 and a hypotenuse 28 and a front panel 29 in the form of an isosceles triangle having a base 31 and two legs 32 and 33.
The leg 255 of each of the side panels 23, 24 is aflfixed to the floor 16 of the cabinet adjacent the lower edge 13 of each of its side walls 14 and 15 respectively and the panels 23, 24 are inclined toward each other with their upper apices meeting as at 34 and with their legs 27 affixed to the back wall 13 of the cabinet. The front panel 29 has its base 31 affixed to the floor 16 of the cabinet adjacent the lower edge 18 of its front wall 12 and the opposed legs 32 and 33 off front panel 29 are afiixcd to the adjacent hypotenuse 23. of panels 23 and 24 respectively with the apex of panel 29 meeting the junction 3 of the apices of panels 23 and 24.
Also mounted in the cabinet 11 between its side walls 14- and 15 is a baffle member 36 illustratively a substantially rectangular panel affixed at its lower edge 37 to the front wall 12 immediately above the upper edge 33 of opening 19. The panel 36 is inclined toward front panel 29 of the ba'i'fie structure 22 with its upper edge 39 lying in substantially the same horizontal plane as the apices of panels 23, 24 and 25 and spaced therefrom.
Desirably rising from the upper edge 39 of panel 36 is a rectangular baffle panel 42 which also extends between side walls 14 and 15 and is inclined toward the back wall 13, the area between the upper edge 43 of panel 42 and the back wall 13 and side walls 14 and 15 defining the throat of the horn.
A speaker 44 is mounted on front wall 12 behind an opening 45 therein with the concave side of the speaker facing toward the opening 45 so that high frequency notes will be radiated directly into the room.
The panels 36 and 42 together with the baflle structure 22 and the back wall 13 and side walls 14, 15 of the cabinet form the horn and the dimensions and angles of inclination of the various elements are selected so that from the throat T to the mouth of the horn the rate of taper will be such that the cross sectional area of the horn will double for each increment of length based on the cut off frequency desired. In addition, the dimensions are selected so that the eifective mouth area which is the sum of the actual mouth area defined by openings 19, 20 and 21 plus the extensions of such mouth caused by the effect of the floor in front and on the sides of the cabinet and the portion of the wall against which the cabinet is placed on each side of the latter, will be equal to the required mouth area, for high fidelity response at the desired cut off frequency.
Generally, the mouth area of the horn should equal ap proximately the area of a circle whose diameter is 1/11 times the wavelength of the lowest frequency to be reproduced and the rate of taper or the distance in which the sectional area doubles expressed in feet is equal to 62.5 frequency in cycles per second As the formulas for determining the desired mouth area and the rate of taper for a given out oif frequency are well known in the acoustic art, they will not be discussed.
Where it is necessary to increase the effective length of the passageway through which the sound waves travel in order to achieve the desired taper and mouth area, additional bafile plates may be provided.
Thus, in the embodiment shown in Fig. 4 which is substantially identical to Fig. 2, a baffle plate 46 extending between the side walls 14 and 15 may have its lower edge 47 affixed to back wall 13 and its upper edge 48 aff xed to top wall 17. An associated baflle plate 49 also extending between side walls 14 and 15 may have its lower edge 51 aflixed to the upper edge 43 of bathe plate 42 and its upper edge 52 spaced from the top wall 17.
The bathe plates 46 and 49 which define therebetween a continuation of the passageway between baffle plate 42 and rear wall 13 and baffle plate 36 and battle structure 22, are so positioned in the cabinet that the sectional area of the combined passageway will increase exponentially from one end to the other.
With the construction above described, by reason of the fact that the three openings defining the mouth utilize the floor in front of and on each side of the cabinet as well as the room wall on each side of the cabinet to increase the effective area of the mouth of the horn, the length of the horn may be a minimum even with the required rate of taper for the low cut off frequency desired.
Consequently, the horn may be relatively compact in size, suitable for home use and as it may be positioned against any portion of the wall of a room its usefulness is enhanced.
Although the cabinet-horn above described is especially suitable for home use, it can also be used in large auditoriums where a large volume of sound is required.
As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:
l. A horn for use with a loud speaker unit, comprising a substantially rectangular cabinet having a floor, a top wall, front and back walls and side walls, a baffle structure rising from said floor adjacent its walls and tapering to a point against the back wall of said cabinet sub stantially midway between its side walls, said front and side walls each having an opening adjacent said fioor, said openings defining the mouth of the horn, an inclined baffie plate in said cabinet spaced from said baffie structure to define a passageway therebetween, said baflle plate having its lower edge substantially aligned with the upper edge of the opening in the front wall and its upper edge spaced from the top of the baffle structure, the sectional area of said passageway increasing exponentially from one end to the other.
7 2. The combination set forth in claim 1 in which the upper edge of said plate lies in the same horizontal plane as the top of said bafile structure.
3. The combination set forth in claim 1 in which said bafile structure has a front panel and two side panels, each of the side panels being a right triangle having one leg against the back wall, a second leg against the floor and its hypotenuse extending from the back wall to the front wall, and the front panel is an isosceles triangle having its base against the floor and its legs against the hypotenuse of each of the side panels.
4. The combination set forth in claim 1 in which said bafile structure has a front panel and two side panels, each of the side panels being a right triangle having one leg against the back wall, a second leg against the floor and its hypotenuse extending from the back wall to the front wall, and the front panel is an isosceles triangle having its base against thefloor and its legs against the hypotenuse of each of the side panels, the upper apices of said three panels lying in substantially the same horizontal plane as the upper edge of the baflle plate.
5. The combination set forth in claim 1 in which said bafiie plate extends from one side wall of the cabinet to the other.
6. The combination set forth in claim 1 in which a second baffie plate is provided, affixed at its lower edge to the upper edge of said first baffle plate and inclined toward the back wall of the cabinet, the passageway defined between the second bafiie plate and the back Wall of the cabinet forming a continuation of the passageway between the first baffie plate and the baifle structure, the sectional area of the combined passageways increasing exponentially from one end to the other.
7. The combination set forth in claim 6 in which a pair of additional spaced baffie plates are provided having their lower edges affixed against the back wall of the cabinet and the upper edge of the second baflle plate, the upper edge of the plate having its lower edge afiixed to the back wall being affixed to the top wall of the cabinet and the upper edge of the other of said pair of plates being spaced from said top wall, the passageway defined between said pair of additional baffie plates being a continuation of the combined passageways, the sectional area of the combined three passageways increasing exponentially from one end to the other.
8. The combination set forth in claim 1 in which each of said openings extends substantially the entire width of the associated wall.
9. A horn for use with a loud speaker unit, comprising a substantially rectangular cabinet having a floor, a top wall, front and back walls and side walls, a baflle structure in said cabinet comprising a front panel and two side panels, each of the side panels being a right triangle having one leg against the back wall, a second leg against the floor adjacent the side walls respectively and its hypotenuse extending from the back wall to the front wall, the front panel being an isosceles triangle having its base against the floor adjacent the front wall and its legs against the hypotenuse of each of the side panels, the upper apices of each of said three panels meeting at a point against the back wall substantially midway between the side walls of the cabinet, said front and side walls each having an opening therethrough adjacent the floor of the cabinet extending substantially the width of the associated wall and defining the mouth of the horn, an inclined baffle plate in said cabinet extending from one side wall to the other, having its lower edge aligned with the upper edge of the opening in the front panel and its upper edge lying in substantially the same horizontal plane as the top of the bafile structure, said baffle plate being spaced from the bafile structure to define a passageway therebetween, the sectional area of said passageway increasing exponentially from one end to the other and a second bafile plate, affixed at its lower edge to the upper edge of the first baffie plate and inclined toward the back wall of the cabinet, the passageway defined between the second baffle plate and the back wall of the cabinet forming acontinuation of the passageway between the first baffie plate and the baffle structure, the sectional area of the combined passageways increasing exponentially from one end to the other.
10. The combination set forth in claim 9 in which a loud speaker is mounted on the front wall of the cabinet on a level substantially the same as that of the upper edge of the second baflle plate.
11. The combination set forth in claim 9 in which a pair of additional spaced bafiie plates are provided having their lower edges aflixed against the back wall of the cabinet and the upper edge of the second baflie plate, the upper edge of the plate having its lower edge afiixed to the back wall being afiixed to the top wall of the cabinet and the upper edge of the other of said pair of plates being spaced from said top wall, the passageway defined between said pair of additional baflle plates being a continuation of the combined passageways, the sec tional area of the combined three passageways increasing exponentially from one end to the other and a loud speaker is mounted on the front wall of the cabinet on a level between the upper edge of the second baffie plate and the upper edge of the other of said pair of additional bathe plates spaced from said top wall.
Wheeler et a1. Apr. 21, 1936 Olson Dec. 17, 1940
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US447943A US2751997A (en) | 1954-08-05 | 1954-08-05 | Low frequency horn |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US447943A US2751997A (en) | 1954-08-05 | 1954-08-05 | Low frequency horn |
Publications (1)
Publication Number | Publication Date |
---|---|
US2751997A true US2751997A (en) | 1956-06-26 |
Family
ID=23778376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US447943A Expired - Lifetime US2751997A (en) | 1954-08-05 | 1954-08-05 | Low frequency horn |
Country Status (1)
Country | Link |
---|---|
US (1) | US2751997A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2971598A (en) * | 1956-08-23 | 1961-02-14 | Sieler George Jerome | Loud speaker |
US4251687A (en) * | 1978-01-12 | 1981-02-17 | Hans Deutsch | Stereophonic sound reproducing system |
EP0132530A2 (en) * | 1983-05-31 | 1985-02-13 | Rainer Boscheinen | Loudspeaker box |
DE3637910A1 (en) * | 1986-11-06 | 1988-05-19 | Joachim Weckler | SPEAKER HOUSING |
US5012889A (en) * | 1989-11-30 | 1991-05-07 | Rogersound Labs, Inc. | Speaker enclosure |
US5111905A (en) * | 1989-11-30 | 1992-05-12 | Rogersound Labs, Inc. | Speaker enclosure |
US6349792B1 (en) | 2000-04-07 | 2002-02-26 | Harold N. Smith, Jr. | Sound enhancing speaking cabinet for a removable speaker assembly |
US20040104069A1 (en) * | 2001-02-19 | 2004-06-03 | Ilpo Martikainen | Bass-reflex loudspeaker sysstem and method of manufacturing the same |
US20080169151A1 (en) * | 2007-01-12 | 2008-07-17 | Qsc Audio Products, Inc. | Loudspeaker Port Handle |
US8064627B2 (en) | 2007-10-22 | 2011-11-22 | David Maeshiba | Acoustic system |
US8256566B1 (en) * | 2011-08-19 | 2012-09-04 | Rogersound Labs, LLC | Speaker enclosure |
US20220369027A1 (en) * | 2019-06-28 | 2022-11-17 | Nnnn As | Directional loudspeaker |
US11871179B1 (en) * | 2022-05-02 | 2024-01-09 | John Patrick Van Den Abeele | Audio and musical instrument amplification and loudspeaker system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2038253A (en) * | 1935-04-10 | 1936-04-21 | Haseltine Corp | Sound reproducing apparatus |
US2224919A (en) * | 1937-03-31 | 1940-12-17 | Rca Corp | Loud-speaker |
-
1954
- 1954-08-05 US US447943A patent/US2751997A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2038253A (en) * | 1935-04-10 | 1936-04-21 | Haseltine Corp | Sound reproducing apparatus |
US2224919A (en) * | 1937-03-31 | 1940-12-17 | Rca Corp | Loud-speaker |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2971598A (en) * | 1956-08-23 | 1961-02-14 | Sieler George Jerome | Loud speaker |
US4251687A (en) * | 1978-01-12 | 1981-02-17 | Hans Deutsch | Stereophonic sound reproducing system |
EP0132530A2 (en) * | 1983-05-31 | 1985-02-13 | Rainer Boscheinen | Loudspeaker box |
EP0132530A3 (en) * | 1983-05-31 | 1986-10-29 | Rainer Boscheinen | Loudspeaker box |
DE3637910A1 (en) * | 1986-11-06 | 1988-05-19 | Joachim Weckler | SPEAKER HOUSING |
US4807293A (en) * | 1986-11-06 | 1989-02-21 | Joachim Weckler | Loudspeaker housing |
US5012889A (en) * | 1989-11-30 | 1991-05-07 | Rogersound Labs, Inc. | Speaker enclosure |
US5111905A (en) * | 1989-11-30 | 1992-05-12 | Rogersound Labs, Inc. | Speaker enclosure |
US6349792B1 (en) | 2000-04-07 | 2002-02-26 | Harold N. Smith, Jr. | Sound enhancing speaking cabinet for a removable speaker assembly |
US7051835B2 (en) * | 2001-02-19 | 2006-05-30 | Genelec Oy | Bass-reflex loudspeaker system and method of manufacturing the same |
US20040104069A1 (en) * | 2001-02-19 | 2004-06-03 | Ilpo Martikainen | Bass-reflex loudspeaker sysstem and method of manufacturing the same |
US20080169151A1 (en) * | 2007-01-12 | 2008-07-17 | Qsc Audio Products, Inc. | Loudspeaker Port Handle |
US7789192B2 (en) * | 2007-01-12 | 2010-09-07 | Qsc Audio Products, Inc. | Loudspeaker port handle |
US8064627B2 (en) | 2007-10-22 | 2011-11-22 | David Maeshiba | Acoustic system |
US20120061174A1 (en) * | 2007-10-22 | 2012-03-15 | David Maeshiba | Acoustic system |
US8256566B1 (en) * | 2011-08-19 | 2012-09-04 | Rogersound Labs, LLC | Speaker enclosure |
US20130043089A1 (en) * | 2011-08-19 | 2013-02-21 | Rogersound Labs Llc | Speaker enclosure |
US8397860B2 (en) * | 2011-08-19 | 2013-03-19 | Rogersound Labs, LLC | Speaker enclosure |
US20220369027A1 (en) * | 2019-06-28 | 2022-11-17 | Nnnn As | Directional loudspeaker |
US11882400B2 (en) * | 2019-06-28 | 2024-01-23 | Nnnn As | Directional loudspeaker |
US11871179B1 (en) * | 2022-05-02 | 2024-01-09 | John Patrick Van Den Abeele | Audio and musical instrument amplification and loudspeaker system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4249037A (en) | Pyramid loudspeakers with twin cross-phased mid-range speakers | |
US2751997A (en) | Low frequency horn | |
US4073365A (en) | Speaker system | |
US2310243A (en) | Horn for loud-speaker | |
US4313032A (en) | Folded horn loudspeaker system | |
US5111905A (en) | Speaker enclosure | |
US4593784A (en) | Loudspeaker enclosure | |
US4270023A (en) | Cylindrical speaker mechanism | |
CN102326196A (en) | The sound produces system, sound acceptance system, sound production method, sound recording method, sound method of adjustment, sound adjustment program, sound field Adjustment System, loudspeaker pedestal, furniture, loudspeaker enclosure and speaker unit | |
US2205804A (en) | Tone modifier device for electrical musical instruments | |
US20050087392A1 (en) | Loudspeaker enclosure | |
JP2791661B2 (en) | Speaker cabinet | |
US3983333A (en) | Loud speaker system | |
US2822884A (en) | Loudspeaker enclosure | |
US2801704A (en) | Diffused-tone cabinet | |
US3032137A (en) | Folded speaker enclosure | |
US2904123A (en) | Loud-speaker enclosures | |
US4413703A (en) | Bass-reflex type speaker system | |
US2792069A (en) | Loud speaker cabinet including a horn | |
US4437539A (en) | Speaker enclosure | |
US3412824A (en) | Speaker cabinet enclosure | |
US3135348A (en) | Speaker enclosure | |
US4753317A (en) | Trapezoidal loudspeaker enclosure | |
US2005300A (en) | Baffle for loud speakers | |
JPH07129182A (en) | Acoustic panel |