Patent US4230905A successfully refreshed from Google Patents.
US4230905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic system with discrete bass channels
Assignee: Individual
•
Filing: 1978-08-18
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Granted: 1980-10-28
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Expires: 1998-08-18
Abstract
Abstract The stereophonic system includes a pair of right and left channel sub-bass converters in addition to the usual right and left channel main speakers. The main speakers are spaced apart from each other at one end of a space and the two sub-bass converters are spaced apart from each other at the opposite end of the space. The preferred position of a listener is generally between the two sub-bass converters. Each sub-bass converter comprises an inner housing defining a first chamber and a larger outer housing which is inverted over the inner housing, so that a second chamber is defined between the two housings, above and around the inner housing. The lower end of the inner housing serves as a floor contacting base. The outer housing has a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the sub-bass converter, leading out from the second chamber, is formed near the base of the sub-bass converter. An upwardly directed vibrating cone type low frequency speaker is located within the inner housing. Such speaker has a peripheral mounting portion bordering a speaker opening in the top wall of the inner housing.
Inventors
- 👤 Ronald J. Crum
- 👤 Edward J. Churchill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:19
CPC Classifications
H; H04; H04S; H04S3/00; H04R; H04R5/00; H04R5/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
432 words
A stereo system and arrangement comprising: a right channel main speaker unit; a left channel main speaker unit spaced from said right channel speaker at one end of a space; a right channel subwoofer; a left channel subwoofer spaced from said right channel subwoofer at an opposite end of said space; a listening position for a listener in said space generally between said subwoofers; means providing audio sound information; means for dividing said audio sound information into right and left stereo channels and directing said channels to the right and left main speaker units, respectively; means for selecting a low frequency portion of the audio sound information that is delivered to the right channel main speaker unit and directing it to the right channel subwoofer, so that such low frequency audio sound information will be played both by the subwoofer and by the right channel main speaker unit, but the remaining right channel audio sound information will be played by the right channel main speaker unit alone; means for selecting a low frequency portion of the audio sound information that is delivered to the left channel main speaker unit and directing it to the left channel subwoofer, so that such low frequency audio sound information will be played both by the subwoofer and by the left channel main speaker unit, but the remaining left channel audio information will be played by the left channel main speaker unit alone; and each said subwoofer comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber which is closed except for the speaker outlet opening in the top wall; a larger outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housings, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second air chamber; an upwardly directed vibrating diaphragm type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; and means connecting said peripheral mounting portion to the inner housing.
Claim 2
Dependent Claim
432 words
A stereo system and arrangement comprising: a right channel main speaker unit; a left channel main speaker unit spaced from said right channel speaker at one end of a space; a right channel subwoofer; a left channel subwoofer spaced from said right channel subwoofer at an opposite end of said space; a listening position for a listener in said space generally between said subwoofers; means providing audio sound information; means for dividing said audio sound information into right and left stereo channels and directing said channels to the right and left main speaker units, respectively; means for selecting a low frequency portion of the audio sound information that is delivered to the right channel main speaker unit and directing it to the right channel subwoofer, so that such low frequency audio sound information will be played both by the subwoofer and by the right channel main speaker unit, but the remaining right channel audio sound information will be played by the right channel main speaker unit alone; means for selecting a low frequency portion of the audio sound information that is delivered to the left channel main speaker unit and directing it to the left channel subwoofer, so that such low frequency audio sound information will be played both by the subwoofer and by the left channel main speaker unit, but the remaining left channel audio information will be played by the left channel main speaker unit alone; and each said subwoofer comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber which is closed except for the speaker outlet opening in the top wall; a larger outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housings, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second air chamber; an upwardly directed vibrating diaphragm type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; and means connecting said peripheral mounting portion to the inner housing.
Claim 3
Dependent Claim
25 words
A stereo system according to claim 1, wherein the right and left channel main speaker units are elevated substantially above the level of said subwoofers.
Claim 4
Dependent Claim
246 words
A subwoofer for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a cup-shaped second chamber is defined between the two housings, above the top wall of the inner housing and around the side walls of the inner housing; said inner housing having a lower end which serves as a floor contacting base and a vertical side wall surface; said outer housing having a 360° extending lower edge which is spaced vertically above the level of said base and horizontally outwardly from the vertical side wall surface of the inner housing, so that a downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber downwardly towards the floor; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; said closed top wall of the outer housing presenting a generally flat surface facing towards the speaker which rebounds the energy emitted from the speaker back to such speaker; and means connecting said peripheral mounting portion to the inner housing.
Claim 5
Dependent Claim
246 words
A subwoofer for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a cup-shaped second chamber is defined between the two housings, above the top wall of the inner housing and around the side walls of the inner housing; said inner housing having a lower end which serves as a floor contacting base and a vertical side wall surface; said outer housing having a 360° extending lower edge which is spaced vertically above the level of said base and horizontally outwardly from the vertical side wall surface of the inner housing, so that a downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber downwardly towards the floor; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; said closed top wall of the outer housing presenting a generally flat surface facing towards the speaker which rebounds the energy emitted from the speaker back to such speaker; and means connecting said peripheral mounting portion to the inner housing.
Claim 6
Dependent Claim
39 words
A subwoofer according to claim 3, wherein the height of the subwoofer from the bottom of said floor contacting base up to the top surface of the top wall of the outer housing measures between eighteen and twenty-five inches.
Claim 7
Dependent Claim
21 words
A subwoofer according to claim 4, wherein the maximum width dimension of the subwoofer also measures between eighteen and twenty-five inches.
Claim 8
Dependent Claim
252 words
A subwoofer for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said connector means comprising a plurality of vertically elongated connector members spaced about the subwoofer, and each including an inner portion in contact with a side wall portion of the outer housing, an upper end portion which projects upwardly above the top wall of the inner housing and makes contact with the top wall of the outer housing, and lower end which terminates above the lower edge of the outer housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; and means connecting said peripheral mounting portion to the inner housing.
Claim 9
Dependent Claim
252 words
A subwoofer for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said connector means comprising a plurality of vertically elongated connector members spaced about the subwoofer, and each including an inner portion in contact with a side wall portion of the outer housing, an upper end portion which projects upwardly above the top wall of the inner housing and makes contact with the top wall of the outer housing, and lower end which terminates above the lower edge of the outer housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; and means connecting said peripheral mounting portion to the inner housing.
Claim 10
Dependent Claim
184 words
A subwoofer for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a larger outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker having a peripheral mounting portion bordering said speaker opening; means connecting said peripheral mounting portion to the inner housing; and said first and second chambers being substantially balanced accoustically.
Claim 11
Dependent Claim
184 words
A subwoofer for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a larger outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker having a peripheral mounting portion bordering said speaker opening; means connecting said peripheral mounting portion to the inner housing; and said first and second chambers being substantially balanced accoustically.
Claim 12
Dependent Claim
190 words
A subwoofer, for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; means connecting said peripheral mounting portion to the inner housing; and a sound absorbing material within both said chambers.
Claim 13
Dependent Claim
190 words
A subwoofer, for a stereo system, comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; means connecting said peripheral mounting portion to the inner housing; and a sound absorbing material within both said chambers.
Claim 14
Dependent Claim
281 words
A subwoofer for a stereo system comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a larger outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and the outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; means connecting said peripheral mounting portion to the inner housing; wherein said connector means comprises a plurality of vertically elongated connector members spaced about the subwoofer, each including an inner portion in contact with a side wall of the inner housing, an outer portion in contact with a side wall portion of the outer housing, an upper end portion which projects upwardly above the top wall of the inner housing and makes contact with the top wall of the outer housing, and a lower end which terminates above the level of the lower edge of the outer housing; and wherein the first and second chambers are substantially balanced accoustically.
Claim 15
Dependent Claim
281 words
A subwoofer for a stereo system comprising: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a larger outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and the outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housing, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; means connecting said peripheral mounting portion to the inner housing; wherein said connector means comprises a plurality of vertically elongated connector members spaced about the subwoofer, each including an inner portion in contact with a side wall of the inner housing, an outer portion in contact with a side wall portion of the outer housing, an upper end portion which projects upwardly above the top wall of the inner housing and makes contact with the top wall of the outer housing, and a lower end which terminates above the level of the lower edge of the outer housing; and wherein the first and second chambers are substantially balanced accoustically.
Claim 16
Dependent Claim
152 words
A stereo system comprising: a full spectrum right channel main speaker unit; a full spectrum left channel main speaker unit; a right channel subwoofer within a first cabinet; a left channel subwoofer within a second cabinet that is spaced from said first cabinet, so that the two subwoofers are accoustically separated; means providing audio sound information; means for dividing said audio sound information into full spectrum right and left stereo channels and directing said channels to the right and left main speaker units, respectively; means for selecting a low frequency portion of the audio sound information that is delivered to the right channel subwoofer, so that such low frequency audio sound information will be played both by the subwoofer and by the left channel main speaker unit, and the remaining left channel audio sound information will be played by the left channel main speaker unit but not by the right channel subwoofer.
Claim 17
Dependent Claim
152 words
A stereo system comprising: a full spectrum right channel main speaker unit; a full spectrum left channel main speaker unit; a right channel subwoofer within a first cabinet; a left channel subwoofer within a second cabinet that is spaced from said first cabinet, so that the two subwoofers are accoustically separated; means providing audio sound information; means for dividing said audio sound information into full spectrum right and left stereo channels and directing said channels to the right and left main speaker units, respectively; means for selecting a low frequency portion of the audio sound information that is delivered to the right channel subwoofer, so that such low frequency audio sound information will be played both by the subwoofer and by the left channel main speaker unit, and the remaining left channel audio sound information will be played by the left channel main speaker unit but not by the right channel subwoofer.
Claim 18
Dependent Claim
186 words
A stereo system according to claim 10, wherein each subwoofer comprises: an inner housing comprising a closed bottom wall, closed side walls and a top wall including a speaker opening, together forming a first chamber; a large outer housing comprising a closed top wall, closed side walls, and an open lower end, said outer housing being inverted over the inner housing; connector means between the inner and outer housing supporting them in a spaced relationship, so that a second chamber is defined between the two housings, above and around the inner housing; said inner housing having a lower end which serves as a floor contacting base; said outer housing having a 360° extending lower edge which is spaced above the level of said base, so that a generally downwardly directed, 360° extending outlet for the subwoofer, is formed near the base of the subwoofer, leading out from the second chamber; an upwardly directed vibrating cone type low frequency speaker located within said inner housing, said speaker having a peripheral mounting portion bordering said speaker opening; and means connecting said peripheral mounting portion to the inner housing.
Claim 19
Dependent Claim
99 words
A stereophonic sound reproducing method, comprising: dividing recorded stereophonic audio information into two full spectrum channels; amplifying each full spectrum information and directing it to a main speaker means for such channel; sand the improvement comprising; directing a duplicate low frequency portion only of each channel information to a subwoofer speaker for such channel which is physically spaced apart from the subwoofer for the other channel in a separate cabinet, and which is accoustically isolated from the subwoofer for the other channel, and with said subwoofers being spaced generally across a listening space from the two main channel speakers.
Claim 20
Dependent Claim
99 words
A stereophonic sound reproducing method, comprising: dividing recorded stereophonic audio information into two full spectrum channels; amplifying each full spectrum information and directing it to a main speaker means for such channel; sand the improvement comprising; directing a duplicate low frequency portion only of each channel information to a subwoofer speaker for such channel which is physically spaced apart from the subwoofer for the other channel in a separate cabinet, and which is accoustically isolated from the subwoofer for the other channel, and with said subwoofers being spaced generally across a listening space from the two main channel speakers.
Claim 21
Dependent Claim
29 words
The method of claim 12 further comprising directing the sound waves from each subwoofer downwardly and generally perpendicularly towards the floor and generally omni directional outwardly over the floor.
Claim 22
Dependent Claim
31 words
The method of claim 13, further comprising directing the full spectrum sound waves from each main speaker means generally laterally outwardly at a level substantially and exclusively above the subwoofer speakers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |