Abstract: A portable audio device is configured to generate acoustic output in conjunction with an auxiliary audio device when the portable audio device and the auxiliary audio device both reside within a given boundary. When the portable audio device enters a region defined by the boundary, the portable audio device determines optimized device settings and/or parameters for the portable audio device and for the auxiliary audio device based on differences between the operational capabilities of those two audio devices. When the portable audio device exits the region defined by the boundary, the portable audio device returns to nominal operation.

Abstract: A portable audio device is configured to generate acoustic output in conjunction with an auxiliary audio device when the portable audio device and the auxiliary audio device both reside within a given boundary. When the portable audio device enters a region defined by the boundary, the portable audio device determines optimized device settings and/or parameters for the portable audio device and for the auxiliary audio device based on differences between the operational capabilities of those two audio devices. When the portable audio device exits the region defined by the boundary, the portable audio device returns to nominal operation.

Abstract: A composite loudspeaker diaphragm is disclosed having first and second substantially flat carbon fiber skins, and a honeycomb core sandwiched between the first and second carbon skins. In a preferred form, each carbon fiber skin comprises a sheet formed of primarily unidirectional carbon filaments bound together by an epoxy resin. In the preferred embodiment, the honeycomb core is formed of nomex, and is glued with epoxy to the first and second carbon skins, and then heated. The sandwich diaphragm is manufactured so that the direction of the carbon fibers of the cross plies of each outer skin are out of phase relative to each other, preferably in the range of approximately ninety degrees. The improved diaphragm is used in an flat-panel loudspeaker system having improved performance at higher frequencies.

Abstract: A composite loudspeaker diaphragm is disclosed having first and second substantially flat carbon fiber skins, and a honeycomb core sandwiched between the first and second carbon skins. In a preferred form, each carbon fiber skin comprises a sheet formed of primarily unidirectional carbon filaments bound together by an epoxy resin. In the preferred embodiment, the honeycomb core is formed of nomex, and is glued with epoxy to the first and second carbon skins, and then heated. The sandwich diaphragm is manufactured so that the direction of the carbon fibers of the cross plies of each outer skin are out of phase relative to each other, preferrably in the range of approximately ninety degrees. The improved diaphragm is used in an flat-panel loudspeaker system having improved performance at higher frequencies.