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US3712411A Expired / Lapsed US ⏱️ 0.0 years remaining

Loud speaker cabinet

Assignee: Individual
•
Filing: 1972-03-17
•
Granted: 1973-01-23
•
Expires: 1992-03-17
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Abstract

Abstract A loudspeaker system is provided comprising a vibration-free cabinet of minimum interior size having a relatively thick front wall including two spaced parallel sound exit apertures. A loudspeaker is attached to the rear of the front wall with its cone communicating directly with one of the exit apertures, and a sound-delay chamber of constant cross-section throughout its length is interposed between the second exit aperture and the interior of the cabinet, leading to the rear of the speaker cone. Sound waves from the two resulting sound paths reinforce each other in a slightly out-of-phase relationship which enhances the quality and depth of the resulting overall sound and utilizes the full power of the speaker. Also, microphone-speaker feedback is substantially eliminated at normal power and at locations beyond approximately one foot from the front of the cabinet.

Inventors

  • 👤 D Monroe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 20:00
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2815; H04R1/2823; H04R1/2826

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 118 words
A loudspeaker system comprising a cabinet including front, rear, side, and end walls, each of said walls being of a thickness sufficient to substantially prevent vibration thereof, a pair of spaced sound exit apertures in said front wall, a loudspeaker in said cabinet and attached to the front wall in communication with one of said apertures, a sound delay chamber intermediate the other of said apertures and the interior of said cabinet, said chamber having a constant cross-sectional area throughout the length thereof effective to delay substantially all sounds passing therethrough, and said front wall having a thickness such that each of said apertures has a length approximately equal to one third the average distance across said aperture.
Claim 2
Dependent Claim 118 words
A loudspeaker system comprising a cabinet including front, rear, side, and end walls, each of said walls being of a thickness sufficient to substantially prevent vibration thereof, a pair of spaced sound exit apertures in said front wall, a loudspeaker in said cabinet and attached to the front wall in communication with one of said apertures, a sound delay chamber intermediate the other of said apertures and the interior of said cabinet, said chamber having a constant cross-sectional area throughout the length thereof effective to delay substantially all sounds passing therethrough, and said front wall having a thickness such that each of said apertures has a length approximately equal to one third the average distance across said aperture.
Claim 3
Dependent Claim 36 words
A loudspeaker system according to claim 1 wherein said apertures are circular and are each on the order of 4 inches in diameter and said front wall is on the order of 1 1/4 inches thick.
Claim 4
Dependent Claim 39 words
A loudspeaker system according to claim 1 wherein said chamber extends parallel to said first wall and has an outlet opening communicating with said other of said apertures and an inlet opening communicating with said interior of said cabinet.
Claim 5
Dependent Claim 33 words
A loudspeaker system according to claim 3 wherein said delay chamber has a cross-sectional area on the order of 6 1/4 square inches and a length on the order of 5 1/4 inches.
Claim 6
Dependent Claim 30 words
A loudspeaker system according to claim 3 wherein the interior of said cabinet is on the order of 12 1/4 inches high, 6 1/4 inches wide and 6 inches deep.
Claim 7
Dependent Claim 23 words
A loudspeaker system according to claim 5 wherein said inlet opening is adjacent the said end wall remote from said first mentioned aperture.
Claim 8
Dependent Claim 15 words
A loudspeaker system according to claim 6 wherein said chamber extends across said other aperture.

References Cited (Backward Citations)

US1869178A Cited
US2315896A Cited
US3037081A Cited
US2900040A Cited
US2971598A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-23 1976-07-24 1977-01-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-23 1980-07-24 1981-01-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-23 1984-07-24 1985-01-23 $7700.00 Window Closed / Lapsed

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