Patent ID: 8121316
Filing Date: 2012-02-21
Classification: H04R

Abstract:
1. A combination loudspeaker, comprising: an acoustically radiating convex diaphragm; a diverging acoustically radiating horn diaphragm; and a phase plug comprising a body having an input side for receiving acoustic waves from the convex diaphragm and an output side for transmitting acoustic waves into the region within the horn diaphragm, the body including a plurality of channels extending from the input side to the output side for propagating acoustic waves through the body, wherein the input side comprises an input surface which includes a plurality of slots constituting entrances for the channels, each slot being arranged in a substantially radial orientation on the input surface about a central axis extending through the input surface, wherein substantially the entire input surface situated between the slots is concave and substantially part of a sphere or an ellipsoid in shape.