Patent ID: 8066095

Claim:
In combination: a waveguide and at least one loudspeaker mounted on the waveguide; the waveguide having at least one wall and including an interior surrounding an interior space having a cross sectional area described by the formula A=kr x , Where r is the distance along a line form a zero point where r=0, x is an exponent substantially equal to 2, A is the cross sectional area inside the waveguide measured on a surface that is perpendicular to the line at the point wherein the line crosses the surface, and k is a constant of proportionality; wherein the waveguide has an axial length L and extends from a closed end at a distance r=R to an open end at a distance r=R+L, both distances being measured from the zero point, whereby an area of the closed end is smaller than an area of the open end and the waveguide tapers from the open end toward the closed end; wherein the at least one loudspeaker is mounted on the waveguide adjacent to the closed end in such a way that the loudspeaker is acoustically coupled to the interior of the waveguide at the closed end; wherein L is less than R; and wherein an axial extension of the loudspeaker is less than L.