Abstract: An improved loudspeaker comprises an oscillator fitted to an enclosure and able to oscillate to create sound waves. The oscillator, which includes a diaphragm, may be driven in response to an electromagnetic force or passively in response to pressures in the enclosure. The oscillator includes a convoluted tubular chamber which is preferably coiled in a helix about the center of the oscillator. The chamber may be open to the interior of the enclosure and to the exterior of the enclosure. The oscillator should provide a surface area in contact with air in excess to that provided by the diaphragm alone. In a preferred embodiment the baffle forms a framework between two diaphragm membranes,one of which membranes is open centrally to allow access to the center of the baffle and thus to the chamber.