# US 4,398,619 A · Loudspeaker cabinet

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- Number: US 4,398,619 A
- Document ID: US4398619A
- Status: Granted
- Kind: A
- Application number: 06/363,662
- Filed: 1982-03-31
- Granted: 1983-08-16
- Earliest claimed: 1981-04-02
- Inventors: Ronald L. S. Daniel
- Web page: https://patentgrep.com/patent/US4398619A

## CPC

- H04R 1/2811: {for loudspeaker transducers}
- H04R 1/2819: {for loudspeaker transducers}
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

A loudspeaker cabinet comprising front, back, top, bottom and side panels, a speaker drive unit positioned on an upper portion of the front panel, first and second spaced apart sound wave reflector panels positioned below the speaker unit and extending from the front panel towards the rear panel but not engaging the rear panel, a first sound wave pressure relief area defined by the rear panel and the end of the first reflector panel adjacent the rear panel, a second sound wave pressure relief area defined by the rear panel and the end of the second reflector panel adjacent the rear panel, and a third sound wave pressure relief area constituted by a relief aperture which is positioned below the second reflector panel and in the front panel, the loudspeaker cabinet being such that the first and the second reflector panels divide the interior of the loudspeaker cabinet into first, second and third compartments with the speaker drive unit being positioned in the first compartment whereby sound waves from the speaker drive unit are reflected between the first reflector panel and the top panel before passing through the first relief area, and whereby the sound waves are then reflected between the first and the second reflector panels before passing through the second relief area, and whereby the sound waves are then reflected between the second reflector panel and the bottom panel before passing through the third relief area.

## Claims

### Claim 1

A loudspeaker cabinet comprising front, back, top, bottom and side panels, a speaker drive unit positioned on an upper portion of the front panel, first and second spaced apart sound wave reflector panels positioned below the speaker unit and extending from the front panel towards the rear panel but not engaging the rear panel, a first sound wave pressure relief area defined by the rear panel and the end of the first reflector panel adjacent the rear panel, a second sound wave pressure relief area defined by the rear panel and the end of the second reflector panel adjacent the rear panel, and a third sound wave pressure relief area constituted by a relief aperture which is positioned below the second reflector panel and in the front panel, the loudspeaker cabinet being such that the first and the second reflector panels divide the interior of the loudspeaker cabinet into first, second and third compartments with the speaker drive unit being positioned in the first compartment whereby sound waves from the speaker drive unit are reflected between the first reflector panel and the top panel before passing through the first relief area, and whereby the sound waves are then reflected between the first and the second reflector panels before passing through the second relief area, and whereby the sound waves are then reflected between the second reflector panel and the bottom panel before passing through the third relief area.

### Claim 2 (depends on 1)

A loudspeaker cabinet according to claim 1 in which the speaker drive unit is positioned in the upper half of the first compartment.

### Claim 3 (depends on 1)

A loudspeaker cabinet according to claim 1 in which the third relief area is positioned in the upper half of the third compartment.

### Claim 4 (depends on 1, 2, 3)

A loudspeaker cabinet according to claim 1, claim 2 or claim 3 in which the first compartment is larger than the second compartment, and the second compartment is larger than the third compartment.

### Claim 5 (depends on 1, 2, 3)

A loudspeaker cabinet according to claim 1, claim 2 or claim 3 in which the third relief area extends substantially the entire width of the front panel.

### Claim 6 (depends on 1, 2, 3)

A loudspeaker cabinet according to claim 1, claim 2 or claim 3 in which the third relief area is rectangular in shape.

### Claim 7 (depends on 1, 2, 3)

A loudspeaker cabinet according to claim 1, claim 2 or claim 3 in which the edges of the first and the second reflector panels engage the side panels.

### Claim 8 (depends on 1, 2, 3)

A loudspeaker cabinet according to claim 1, claim 2 or claim 3 in which the edges of the first and the second reflector panels engage the side panels, and in which the first and the second reflector panels extend for substantially three quarters of the width of the side panels.