Patent ID: 7039212

Claim:
A loudspeaker system comprising: a transducer; an enclosure for housing said transducer; and a port disposed in said enclosure for tuning the low frequency performance of said loudspeaker system, said port comprising a port tube extending at least in part outside of said enclosure, said port tube having a predetermined internal cross-sectional area, a port cover for covering an outermost opening of said port tube, wherein said port cover is generally cup-shaped so as to fit over and overlap an outermost end of said port tube, wherein a first distance measured between an internal surface of said port cover and an exterior of said port tube is maintained therebetween to be at least approximately equal to one-half of the radius of the predetermined internal cross-section area of said port tube wherein a second distance measured between an edge of said port cover nearest to said enclosure and a wall of said enclosure is greater than the average radius of an average cross-sectional area of said port tube such that a total cross-sectional area of an opening created between said port cover and said enclosure is substantially greater than said predetermined internal cross-sectional area of said port tube, such that any line drawn directly from a tangent point on the outer-most end of said port tube through a tangent point on an edge of said port cover nearest to said enclosure intersects with a solid part of said loudspeaker system.