# US 7,461,718 B2 · Loudspeaker enclosure incorporating a leak to compensate for the effect of acoustic modes on loudspeaker frequency response

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- Number: US 7,461,718 B2
- Document ID: US7461718B2
- Status: Granted
- Kind: B2
- Application number: 11/008,510
- Filed: 2004-12-10
- Published: 2005-06-16
- Granted: 2008-12-09
- Earliest claimed: 2003-12-10
- Assignees: Mitel Networks Corporation
- Inventors: Stephane Dedieu; Philippe Moquin
- Web page: https://patentgrep.com/patent/US7461718B2

## CPC

- H04R 1/2819: {for loudspeaker transducers}
- H04R 2499/11: Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
- H04R 2499/15: Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
- 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

An improvement is provided in loudspeaker enclosures characterised by a frequency response having at least one null due to a cavity mode. The improvement comprises introducing an aperture at a high pressure region of said enclosure for provided a pressure leak thereby substantially eliminating said at least one null.

## Claims

### Claim 1

In a loudspeaker enclosure operating in an external pressure field and characterized by a frequency response having at least one null due to a cavity mode in the enclosure, the improvement comprising an aperture in a vicinity of a high pressure region of said enclosure for providing a pressure leak, the aperture communicating an internal pressure field of the enclosure with the external pressure field, the aperture being in phase with the external pressure field for providing a pressure leak to substantially eliminate said at least one null.

### Claim 2 (depends on 1)

The improvement of claim 1, further including damping material in said aperture for smoothing said frequency response.

### Claim 3 (depends on 2)

The improvement of claim 2, wherein said damping material comprises a perforated sheet in said aperture.

### Claim 4

A loudspeaker for operation in an external pressure field, comprising:
an enclosure of predetermined volume and geometry giving rise to at least one null due to a cavity mode there in;
a loudspeaker optimized for use in said enclosure; and
an aperture positioned adjacent a high pressure region of said enclosure for providing a pressure leak, the aperture communicating an internal pressure field of the enclosure with the external pressure field, the aperture being in phase with the external pressure field, for providing a pressure leak to substantially eliminate said at least one null.

### Claim 5 (depends on 4)

The loudspeaker of claim 4, further including damping material in said aperture for smoothing said frequency response.

### Claim 6 (depends on 5)

The loudspeaker of claim 5, wherein said damping material comprises a perforated sheet in said aperture.