Abstract: Aspects of the subject technology relate to a device comprising a moving-coil speaker including a diaphragm to play low-frequency signals from an audio-signal source, and a piezoelectric transducer coupled to the diaphragm to play high-frequency signals from the audio-signal source. A coupler couples the diaphragm to a housing of the device.

Abstract: Aspects of the subject technology relate to a device comprising a moving-coil speaker including a diaphragm to play low-frequency signals from an audio-signal source, and a piezoelectric transducer coupled to the diaphragm to play high-frequency signals from the audio-signal source. A coupler couples the diaphragm to a housing of the device.

Abstract: Aspects of the subject technology relate to a device comprising a moving-coil speaker including a diaphragm to play low-frequency signals from an audio-signal source, and a piezoelectric transducer coupled to the diaphragm to play high-frequency signals from the audio-signal source. A coupler couples the diaphragm to a housing of the device.

Abstract: Aspects of the subject technology relate to a device comprising a moving-coil speaker including a diaphragm to play low-frequency signals from an audio-signal source, and a piezoelectric transducer coupled to the diaphragm to play high-frequency signals from the audio-signal source. A coupler couples the diaphragm to a housing of the device.

Abstract: Aspects of the subject technology relate to a shaker module for an electronic device. The shaker module may include a movable component that is resiliently suspended in relation to a voice coil by one or more gap-separated pairs of the flat springs. The flat springs reduce the z-height of the shaker module for implementation in, for example, compact electronic devices. The gap-separated pairs of flat springs facilitate adjustment of the resonance frequency of the shaker module substantially independently of adjustments to drop performance, while providing stability against unwanted rocking motions of the movable component.

Abstract: An acoustic transducer includes a passive diaphragm and an active diaphragm. The active diaphragm electromechanically couples to an electric drive element and the passive diaphragm is configured to acoustically couple with pressure changes induced by excursions of the active diaphragm. The active diaphragm has an outer perimeter and an inner perimeter, with the X-Y (horizontal) points on the outer perimeter of the passive diaphragm coinciding on or within X-Y points on at least the outer perimeter of the active diaphragm over a common, orthogonal Z coordinate so that the passive diaphragm projects a shape that falls on or within an area of the active diaphragm. In some cases, the inner perimeter of the active diaphragm may define a bounded area for the active diaphragm, the passive diaphragm having an outer perimeter that axially, superimpositionally coincides on or within the inner perimeter of the bounded area.