Loudspeaker system having a bass-reflex port
AssigneeU.S. Philips Corporation
InventorsNicolaas B. Roozen, Abraham Hirschberg, Pascas Van Eck
Life of this patent
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Abstract
A loudspeaker system comprises an enclosure which accommodates a loudspeaker device and a bass-reflex port (105). The port has two open ends (105b, 105c) and a central area (c) provided with perforations (109), as well as a foam material (111) provided in and/or on the perforations.
Claims17
A loudspeaker system comprising an enclosure which accomodates a loudspeaker device and a bass-reflex port,
- said port being a tubular body formed of a single solid material defining a passage extending along a longitudinal axis betwen two open ends, said tubular body having a central area and two other portions, said central area being situated centrally with respect to the open ends, and each of said other portions having a longitudinal length greater than the length of the central area,
- characterized in that said central area is provided with a plurality of perforations spaced longitudinally and circumferentially about the passage,
- each of the other portions is provided with perforations spaced from the central area, and
- the port includes a foam material in and/or on the perforations, said passage being free from said foam material.
A loudspeaker system comprising an enclosure which accomodates a loudspeaker device and a bass-reflex port,
- said port being a tubular body formed of a single solid material defining a passage extending along a longitudinal axis betwen two open ends, said tubular body having a central area and two flared portions, said central area being situated centrally with respect to the open ends, and each of said flared portions having a longitudinal length greater than the length of the central area and flaring outwardly from said central area toward a respective open end,
- characterized in that said central area is provided with perforations, and the port includes a foam material in and/or on the perforations, said passage being free from said foam material.
A loudspeaker system comprising an enclosure which accomodates a loudspeaker device and a bass-reflex port,
- said port being a tubular body formed of a solid material defining a passage extending along a longitudinal axis betwen two open ends, said tubular body having a central area and two flared portions, said central area being situated centrally with respect to the open ends and having a substantially constant cross-section with less flare than the flared portions, each of said flared portions having a longitudinal length greater than the length of the central area and flaring outwardly from said central area toward a respective open end, and said flared portions having longitudinally extending bounding lines extending at an angle having a value between 3° and 12° with respect to the longitudinal axis,
- characterized in that said central area is provided with perforations, and the port includes a foam material in and/or on the perforations, said passage being free from said foam material.
Dependencies are inferred from the claim text.