A diaphragm comprising a relatively rigid central disk made of a firstmaterialcharacterized by a relatively high stiffness； a peripheral attachment ringdisposedabout a peripheral portion of the disk； and an annular flexure made of asecondmaterial characterized by a relatively low stiffness, and extending betweentheperipheral portion of the disk and the attachment ring. Where the annularflexure isbonded to the disk, and the disk, the annular flexure and the peripheral ringform acontiguous assembly.
