Patent ID: 8036408

Claim:
A phasing plug for a compression driver, comprising: a base portion including a first side, a second side, and a plurality of apertures extending between the first and second sides, where the plurality of apertures include a first set of apertures positioned at a first radius from the axis and a second set of apertures positioned at a second radius from the axis and each aperture of the first set is radially aligned with a respective aperture of the second set relative to the axis and where each aperture of the first set defines a fluid passage through the base portion, each aperture of the second set defines a fluid passage through the base portion, and the respective passages of each pair of radially aligned apertures converge toward each other; and a hub portion extending from the base portion along an axis, the hub portion including an outer surface and a plurality of ribs disposed on the outer surface, where a plurality of recesses are defined by the outer surface and respective pairs of adjacent ribs, and at least one aperture fluidly communicates with at least one of the recesses.