US3666041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker enclosure
Assignee: Individual
•
Filing: 1970-07-13
•
Granted: 1972-05-30
•
Expires: 1990-07-13
Abstract
Abstract An improved speaker enclosure provides a close approximation to a true exponentially expanded horn for a bass-responsive speaker in a relatively small-volume cabinet that is disposed at the corner of a room. The cabinet also includes a separate section for a mid-range responsive speaker which can be properly phased with respect to the acoustic waves at the output of the bassresponsive section.
Inventors
- 👤 Alan A Engelhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:35
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
Acoustic apparatus comprising: an enclosure having a front face and containing an acoustic channel therein having an inlet and an outlet for the passage therethrough of acoustic waves from the inlet to the outlet thereof, the channel having a mean acoustic path from the inlet to the outlet and having a cross section which increases with length along the mean acoustic path from inlet to outlet; said channel being substantially symmetrically disposed about a vertical plane and being oriented with the outlet thereof disposed in the front face of the enclosure near the base thereof and with the inlet disposed above the outlet; said mean acoustic path includes a vertically oriented portion which is disposed intermediate the inlet and outlet and which is located rearwardly of the front face of the enclosure; and a bounded chamber within said enclosure which is disposed above the outlet and which communicates substantially only with said inlet of the channel in a boundary of said chamber that is disposed rearwardly of The front face of said enclosure, said inlet of the channel being disposed intermediate said front face and the rearmost portion of said enclosure and being aligned along an inlet axis which is directed generally rearwardly.
Claim 2
Dependent Claim
203 words
Acoustic apparatus comprising: an enclosure having a front face and containing an acoustic channel therein having an inlet and an outlet for the passage therethrough of acoustic waves from the inlet to the outlet thereof, the channel having a mean acoustic path from the inlet to the outlet and having a cross section which increases with length along the mean acoustic path from inlet to outlet; said channel being substantially symmetrically disposed about a vertical plane and being oriented with the outlet thereof disposed in the front face of the enclosure near the base thereof and with the inlet disposed above the outlet; said mean acoustic path includes a vertically oriented portion which is disposed intermediate the inlet and outlet and which is located rearwardly of the front face of the enclosure; and a bounded chamber within said enclosure which is disposed above the outlet and which communicates substantially only with said inlet of the channel in a boundary of said chamber that is disposed rearwardly of The front face of said enclosure, said inlet of the channel being disposed intermediate said front face and the rearmost portion of said enclosure and being aligned along an inlet axis which is directed generally rearwardly.
Claim 3
Dependent Claim
52 words
Acoustic apparatus as in claim 1 wherein the mean acoustic path of said channel spirals in said vertical plane approximately one half revolution from inlet to outlet, and the cross-sectional area of said channel disposed substantially normal to the mean acoustic path increases substantially exponentially with length along said mean acoustic path.
Claim 4
Dependent Claim
55 words
Acoustic apparatus as in claim 1 comprising an electroacoustic transducer for producing acoustic waves in response to electrical signals applied thereto, said transducer being disposed within said bounded chamber at the inlet to said channel for producing in response to applied electrical signals acoustic waves which emanate from the enclosure substantially only through said channel.
Claim 5
Dependent Claim
160 words
Acoustic apparatus as in claim 3 wherein: said electroacoustic transducer is responsive to electrical signals applied thereto over a selected range of signal frequencies; said enclosure includes an additional acoustic channel positioned above the chamber and inlet, said additional acoustic channel having a cross-sectional area which increases substantially exponentially with length along the mean path from the inlet to the outlet thereof, with the mean path of the additional acoustic channel and the inlet and outlet thereof being disposed in substantially horizontal alignment; said outlets of the acoustic and additional acoustic channels have areas which are in the ratio of at least approximately 3:2 and are positioned in the front face of said enclosure for proper phasing of acoustic waves emanating therefrom; and an additional electroacoustic transducer communicating with said inlet of the additional acoustic channel, the additional transducer producing acoustic waves in response to electrical signals applied thereto over a range of signal frequencies higher than said selected range.
References Cited (Backward Citations)
US2224919A
Cited
US2792069A
Cited
US2866513A
Cited
US2801703A
Cited
US2815087A
Cited
US2826260A
Cited
US3032137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |