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A phase plugs or acoustic lens improves the directional audio performance of a loudspeaker. Application of the improved directional audio performance to a sound system in a listening area may improve the performance of the audio system. Configuration of the acoustic lens or phase plug may include bo

A phase plugs or acoustic lens improves the directional audio performance of a loudspeaker. Application of the improved directional audio performance to a sound system in a listening area may improve the performance of the audio system. Configuration of the acoustic lens or phase plug may include both symmetrical and asymmetrical features to provide an improved frequency response and directivity. The improved loudspeaker may provide improved an improved listing location, for example, in a vehicle.

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1. An assembly for improving directivity performance of a speaker assembly comprising: a speaker assembly having a dustcap coupled to a diaphragm; andan acoustic lens coupled to the speaker assembly and configured to cover the dustcap and the diaphragm, the acoustic lens comprising: a first surface

1. An assembly for improving directivity performance of a speaker assembly comprising: a speaker assembly having a dustcap coupled to a diaphragm; andan acoustic lens coupled to the speaker assembly and configured to cover the dustcap and the diaphragm, the acoustic lens comprising: a first surface and a second surface that unite to form an edge to define a perimeter;an effective aperture through the first and second surfaces comprising a plurality of perforations, the effective aperture comprises a dome surface having an apex and a dome base, the dome surface being convex relative to the dustcap;a substantially conical segment that lies between the dome base and the perimeter, where the conical segment is angled from the perimeter to the dome base toward the speaker assembly; anda mounting feature between the conical segment and the perimeter, the mounting feature mated with the speaker assembly to form a substantially air tight seal between the speaker assembly and the acoustic lens. 2. The assembly of claim 1, where the acoustic lens further comprises a solid portion that lies between the effective aperture and the mounting feature. 3. The assembly of claim 2, where at least some of the solid portion lies in a first plane, and the apex lies below the first plane. 4. The assembly of claim 1, where a concentric fold is formed by a union of the dome base and the conical segment, and the concentric fold is positioned adjacently relative to an intersection of the dustcap and the diaphragm. 5. The assembly of claim 1, where the conical segment is angled to form a selected volume of an air space between the speaker assembly and the acoustic lens. 6. The assembly of claim 1, where the dome surface is convex relative to the dustcap to form a selected volume of an air space between the dome surface and the dustcap. 7. The assembly of claim 1, where the acoustic lens comprises ferromagnetic properties. 8. The assembly of claim 7, where the acoustic lens is magnetically coupled to the speaker assembly to provide magnetic flux collection. 9. The assembly of claim 1, where the acoustic lens provides magnetic flux shielding. 10. The assembly of claim 1, where the dome surface and conical segment are configured to reduce vibration of the effective aperture. 11. The assembly of claim 1, where the conical segment is angled based upon a volume displacement of the diaphragm of the speaker assembly, where the volume displacement is a volume of air that is displaced by movement of the diaphragm. 12. The assembly of claim 1, where at least a portion of the substantially conical segment includes at least a portion of the plurality of perforations. 13. The assembly of claim 1, where the effective aperture is substantially located in a central location of the acoustic lens. 14. The assembly of claim 1, where the acoustic lens is configured to increase overall sound power output of the speaker assembly over an operating bandwidth of 200-4000 Hz. 15. The assembly of claim 1, where a surface area of the effective aperture is selected based upon a volume displacement of the diaphragm of the speaker assembly, where the volume displacement is a volume of air that is displaced by movement of the diaphragm. 16. The assembly of claim 1, where the speaker assembly includes a volume displacement of the diaphragm “Vd”, where the volume displacement is a volume of air that is displaced by movement of the diaphragm, where the effective aperture has a surface area, “S”, where the aperture surface area is configured to obtain a desired insertion loss, “IL”, of the acoustic lens with respect to the speaker assembly within a range of frequencies, where insertion loss IL≈0.01⁢(VdS)2+0.001⁢(VdS) within the range of frequencies. 17. An apparatus for improving directivity performance of a speaker assembly comprising: a first surface and a second surface that unite to form an edge to define a perimeter;an effective aperture through the first and second surfaces comprising a plurality of perforations, the effective aperture comprises a dome surface having an apex and a dome base, the dome surface being convex relative to the first surface;a substantially conical segment that lies between the dome base and the perimeter, where the conical segment is angled generally concave relative to the first surface; anda mounting feature between the conical segment and the perimeter, the mounting feature configured to mate with the speaker assembly to form a substantially air tight seal between the speaker assembly and the apparatus. 18. The assembly of claim 17, further comprising a solid portion that lies between the effective aperture and the mounting feature. 19. The assembly of claim 17, where the acoustic lens comprises ferromagnetic properties. 20. An apparatus for improving directivity performance of a speaker assembly comprising: a member including a first surface and a second surface;where the first surface and the second surface unite to form a first edge to define a perimeter, where the perimeter includes a mounting feature;where the first surface and the second surface further unite to form a plurality of perforations arranged to define an effective aperture through the member;where the member further includes a solid portion that lies between the effective aperture and the mounting feature, and where at least some portion of the solid portion lies substantially in a first plane;where the mounting feature includes a foot feature that lies in a second plane, where the foot feature is conformed to mate with a speaker to form a substantially air tight seal between the speaker and the foot feature of the member;where a portion of the effective aperture includes a dome surface having an apex and a dome base, where the apex lies close to the first plane, and the dome base lies close to a third plane, and where the third plane lies between the first plane and the second plane; andwhere the member further includes a substantially conical segment that lies between the dome base of the dome surface and the solid portion.