Patent US3898384A successfully refreshed from Google Patents.
US3898384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker cabinet
Assignee: NECKERMANN VERSAND KGAA
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Filing: 1974-07-26
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Granted: 1975-08-05
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Expires: 1994-07-26
Abstract
Abstract A loudspeaker cabinet incorporates two loudspeakers and an exponential acoustic horn for the two loudspeakers. The horn is provided by various walls of the cabinet and comprises a spirally extending first portion leading to a second portion terminating in a sound exit hole in the front wall of the cabinet. The loudspeakers are installed in such a manner that one side of their diaphragms radiates sound into the horn whilst the other side radiates sound directly through one or more further sound exit holes in the cabinet front wall. A tweeter is also incorporated in the cabinet and the loudspeakers and the tweeter are all installed in such a fashion that their bulk does not interfere with the exponential nature of the growth of the horn free space along the length of the horn.
Inventors
- 👤 Helmut Goeckel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:15
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30; H04R1/28; H04R1/2807; H04R1/2861; H04R1/2865
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
257 words
A loudspeaker cabinet comprising: a front wall defining a first sound exit hole and at least one further sound exit hole; a back wall; an intermediate wall intermediate said front wall and said back wall; a plurality of subsidiary walls between said front wall and said intermediate wall and arranged so as to provide a pressure chamber and a spirally extending first portion of a substantially exponential horn, said horn first portion extending from said pressure chamber to a sound passage defined between said intermediate wall and said back wall; one of said plurality of subsidiary walls being an inclined wall extending, at an angle, from said intermediate wall to said front wall and said substantially exponential horn having a second portion extending to said first sound exit hole and comprising said sound passage and a region partially defined by said inclined wall; at least two loudspeakers each of which comprises a diaphragm and an operating means for the diaphragm and is arranged to radiate sound into said pressure chamber from one side of its said diaphragm and through the or one said further sound exit hole from the outer side of its said diaphragm, each of said loudspeakers being arranged so that its said operating means occupies a volume of said loudspeaker cabinet which is substantially outside the substantially exponentially growing free space of said substantially exponential horn; and a tweeter arranged to occupy another volume of said loudspeaker cabinet which is also substantially outside said substantially exponentially growing free space of said substantially exponential horn.
Claim 2
Dependent Claim
257 words
A loudspeaker cabinet comprising: a front wall defining a first sound exit hole and at least one further sound exit hole; a back wall; an intermediate wall intermediate said front wall and said back wall; a plurality of subsidiary walls between said front wall and said intermediate wall and arranged so as to provide a pressure chamber and a spirally extending first portion of a substantially exponential horn, said horn first portion extending from said pressure chamber to a sound passage defined between said intermediate wall and said back wall; one of said plurality of subsidiary walls being an inclined wall extending, at an angle, from said intermediate wall to said front wall and said substantially exponential horn having a second portion extending to said first sound exit hole and comprising said sound passage and a region partially defined by said inclined wall; at least two loudspeakers each of which comprises a diaphragm and an operating means for the diaphragm and is arranged to radiate sound into said pressure chamber from one side of its said diaphragm and through the or one said further sound exit hole from the outer side of its said diaphragm, each of said loudspeakers being arranged so that its said operating means occupies a volume of said loudspeaker cabinet which is substantially outside the substantially exponentially growing free space of said substantially exponential horn; and a tweeter arranged to occupy another volume of said loudspeaker cabinet which is also substantially outside said substantially exponentially growing free space of said substantially exponential horn.
Claim 3
Dependent Claim
36 words
A loudspeaker cabinet as claimed in claim 1, wherein the two or two of the said loudspeakers are arranged spaced apart and facing one another or back-to-back, said pressure chamber being provided between said two loudspeakers.
Claim 4
Dependent Claim
58 words
A loudspeaker cabinet as claimed in claim 2, wherein said diaphragms of said two loudspeakers are contained in respective ones of two diaphragm-containing chambers extending from said intermediate wall to said front wall and comprising two respective ones of said fuRther sound exit holes and also respective sound entry holes into said pressure chamber from said diaphragm-containing chambers.
Claim 5
Dependent Claim
85 words
A loudspeaker cabinet as claimed in claim 3, wherein said loudspeakers face one another or are back-to-back in directly opposite directions and said pressure chamber contains a wedge-shaped, symmetrically tapering, one of said plurality of subsidiary walls, said wedge-shaped wall extending symmetrically between said chambers so that its narrower edge is directed centrally towards an exit of said pressure chamber leading to said horn first portion and said wedge-shaped wall extending substantially completely across the extent of said sound entry holes of said diaphragm-containing chambers.
Claim 6
Dependent Claim
97 words
A loudspeaker cabinet as claimed in claim 3, wherein said two loudspeakers face one another or are back-to-back in an inclined manner so that said pressure chamber is wedge-shaped and diverges towards a sound exit of said pressure chamber leading to said horn first portion, there being edges of respective ones of said diaphragm-containing chambers which are connected together in airtight manner to form the thin edge of said wedge-shaped pressure chamber, whilst remote edges of respective ones of said diaphragm-containing chambers partially define a sound exit of said pressure chamber leading to said horn first portion.
Claim 7
Dependent Claim
44 words
A loudspeaker cabinet as claimed in claim 5, wherein a relatively thin wall of said plurality of subsidiary walls extends from said thin edge of said wedge-shaped pressure chamber and substantially completely across the extent of said sound entry holes of said diaphragm-containing chambers.
Claim 8
Dependent Claim
20 words
A loudspeaker cabinet as claimed in claim 3, wherein said spirally extending first horn portion extends about said pressure chamber.
Claim 9
Dependent Claim
50 words
A loudspeaker cabinet as claimed in claim 1, wherein said at least two loudspeakers are arranged to radiate sound into said pressure chamber from the rear sides of their said diaphragms, and directly through said at least one further sound exit hole from the front sides of their said diaphragms.
Claim 10
Dependent Claim
75 words
A loudspeaker cabinet as claimed in claim 8, wherein said pressure chamber extends from said front wall only as far as a partition extending intermediate said front wall and said intermediate wall, said partition defining a sound exit of said pressure chamber leading to said horn first position and said spirally extending horn first portion being partially defined by walls of said plurality of subsidiary walls which extend from said partition to said intermediate wall.
Claim 11
Dependent Claim
59 words
A loudspeaker cabinet as claimed in claim 9, wherein said at least two loudspeakers comprise four loudspeakers arranged substantially in a square and having their diaphragms constituted by a single common diaphragm comprising four cone portions for the four loudspeakers, said single common diaphragm having corners with a large radius and being stiffened by creases and/or a cross piece.
Claim 12
Dependent Claim
71 words
A loudspeaker cabinet as claimed in claim 10, wherein said single common diaphragm is mounted in a support dish arranged to act with said single common diaphragm as said pressure chamber, said support dish also supports said operating means of said four loudspeakers and said pressure chamber comprises a single sound exit leading to said first spirally extending horn portion and comprising a hole in the bottom of said support dish.
Claim 13
Dependent Claim
46 words
A loudspeaker cabinet as claimed in claim 11, wherein said partition is in tight abutment against said support dish bottom and defines a partition hole limiting the size of said single sound exit by blanking-off some of said hole in said bottom of said support dish.
Claim 14
Dependent Claim
43 words
A loudspeaker cabinet as claimed in claim 1, and comprising a closed spirally extending labyrinth horn portion extending off said spirally extending first horn portion from a region adjacent a sound exit from said pressure chamber into said spirally extending first horn portion.
Claim 15
Dependent Claim
60 words
A loudspeaker cabinet as claimed in claim 1, wherein said tweeter is attached to one of said subsidiary walls defining an initial part of said spirally extending first horn portion, said tweeter being arranged to radiate sound into a region which is off-set in relation to an exit of said pressure chamber leading to said spirally extending first horn portion.
Claim 16
Dependent Claim
26 words
A loudspeaker cabinet as claimed in claim 1, wherein said tweeter is attached to said intermediate wall and arranged to radiate sound into said sound passage.
Claim 17
Dependent Claim
29 words
A loudspeaker cabinet as claimed in claim 1, wherein said tweeter is attached to said back wall and arranged to radiate sound directly to said first sound exit hole.
Claim 18
Dependent Claim
69 words
A loudspeaker cabinet as claimed in claim 1, wherein said volume occupied by said tweeter is substantially outside said substantially exponentially growing free space of said substantially exponential horn by virtue of its being located on one of said subsidiary walls behind a projecting portion of another of said subsidiary walls, said projecting portion providing a baffle blocking said volume from the path of sound travelling through said horn.
Claim 19
Dependent Claim
31 words
A loudspeaker cabinet as claimed in claim 1, and comprising a tweeter controller operable to control the volume of said tweeter relative to the volume of said at least two loudspeakers.
Claim 20
Dependent Claim
45 words
A loudspeaker cabinet as claimed in claim 1, wherein said sound passage is partially defined by an acoustic guide extending perpendicularly from said intermediate wall to said back wall and in such a direction as to provide said sound passage with its substantially exponential form.
Claim 21
Dependent Claim
40 words
A loudspeaker cabinet as claimed in claim 1, wherein said front wall and said intermediate wall are parallel to one another and said subsidiary walls, except said inclined wall, are vertical to said front wall and to said intermediate wall.
Claim 22
Dependent Claim
18 words
A loudspeaker cabinet as claimed in claim 1, wherein said back wall is parallel to said front wall.
References Cited (Backward Citations)
US2754926A
Cited
US3730291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |