Loudspeaker system having a bass-reflex port

• US 5,892,183 A
• Filed: 02/26/1998
• Issued: 04/06/1999
• Est. Priority Date: 07/26/1997
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Nieuwendijk, Joris A. M., Vael, Jozef E. M., Roozen, Nicolaas B.
• Primary Examiner(s): Dang, Khanh
• Application Number:
  US09/031,372
• Time in Patent Office: 404 Days
• Field of Search: 181/148, 181/156, 181/152, 181/199, 181/160, 381/154, 381/159
• US Class Current: 181/156
• CPC Class Codes: H04R 1/2826 for loudspeaker transducers

Abstract

A loudspeaker system includes an enclosure (1) which accommodates a loudspeaker device (3) and a bass-reflex port (5) having two open ends (5b, 5c). The port has a longitudinal axis (5a) and a length (L) defined by the two open ends, and has a passage which flares towards the two open ends. This provides flared portions (5d, 5e) which extend over a substantial part of the length of the port. In order to minimize undesirable noises and distortions, the flared portions, in a longitudinal section of the port, have bounding lines (7) which extend at an angle α having a value of between 3° and 12° with respect to the longitudinal axis of the port.

Claims

1. A loudspeaker system comprising:

an enclosure;

a loudspeaker device mounted within the enclosure; and

a bass-reflex port having two open ends formed in the enclosure, said bass-reflex port having a longitudinal axis and a length defined by the two open ends, and having a passage flaring towards the two open ends, the bass-reflex port being provided with a central portion and two flared portions, each of said two flared portions extending between the central portion and one of the open ends of the bass-reflex port, each of said two flared portions extending over a part of the length of the bass-reflex port which is larger than the part of the length over which the central portion extends, characterized in that in a longitudinal section of the bass-reflex port, said two flared portions are defined by lines extending at an angle having a value of between 3° and

12°

with respect to the longitudinal axis of the bass-reflex port.

2. A loudspeaker system as claimed in claim 1, characterized in that said angle is 6°

, maximum.

3. A loudspeaker system as claimed in claim 1, characterized in that in a longitudinal section, the bass-reflex port has bounding lines parabolic in shape.

4. A loudspeaker system as claimed in claim 1, characterized in that both open ends of the bass-reflex port have end portions radially rounded towards an exterior of the bass-reflex port.

5. A loudspeaker system as claimed in claim 4, characterized in that the radially rounded end portions have a radius of between 3 and 12 mm.

6. A loudspeaker system as claimed in claim 4, characterized in that the rounded end portions change smoothly into flanges situated outside the bass-reflex port.