Abstract: Various embodiments provide a speech diaphragm module comprising: a body; a lid secured to the body to form an enclosed volume therein; a resilient film secured within the enclosed volume along an attachment join formed around a periphery of the resilient film; and a tensioning feature arranged to displace an operative portion of the resilient film relative to the attachment join to apply a tension across the resilient film. Some other embodiments provide a method of manufacturing a speech diaphragm module, a respirator, and a kit of parts for forming a speech diaphragm module.