Port devices for bass-reflex speaker enclosures
OwnerGeorge A. Galeinventor
Life of this patent
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Abstract
Port devices are provided which are mounted within bass-reflex speaker enclosures behind port openings therein. Each device has an outer mouth opening at the port opening of the speaker and an inner throat opening of smaller area, on the order of two-fifths that of the mouth opening. The devices are in forms including forms having cylindrical or polygonal tubular sections combined with planar inner end wall sections, a stepped form with an additional smaller inner tubular section, and forms with hemispherical and frusto-conical walls. The throat-mouth area ratios and the ratios of the volumes of the devices of those of the enclosures are such as to extend and increase low frequency response without producing booming effects.
Claims12
A port device for a hollow, bass-reflex speaker enclosure, said speaker enclosure comprising a first wall portion having a speaker opening therein and a speaker mounted behind said speaker opening, a second wall portion having a port opening therein, and third wall portions which wall portions define an acoustic chamber wherein the air within that chamber transmits energy from the speaker to the port, said port device comprising:
- a hollow structure having a mouth opening at one end thereof and having a smaller throat opening at an opposite end thereof, said port device being mounted within said enclosure with said mouth opening at said port opening of said enclosure and with said throat opening inside said enclosure in communication with said acoustic chamber.
Dependencies are inferred from the claim text.