Patent ID: 8315419

Claim:
A sound producing system, comprising: an electro-acoustic transducer having an electro-magnetic motor for moving a diaphragm of the transducer back and forth to create acoustic waves, the diaphragm having a surface that includes one or more of a surface of a dust cap of the diaphragm, a surface of a cone of the diaphragm, and a portion of a surface of a surround of the diaphragm; and a solid gas impermeable cover that faces the diaphragm surface, the cover having a surface which faces the diaphragm surface, at least a portion of the cover surface having a contour which is substantially the same as a contour of the diaphragm surface, wherein the system includes an asymmetric exit for the acoustic waves to leave a volume defined between the diaphragm surface and the cover surface.