| 摘要 |
An improved loudspeaker comprises an oscillator fitted to an enclosure and able to oscillate to create sound waves. The os- cillator may be driven in response to an electromagnetic force or passively in response to pressures in the enclosure. The oscillator includes an air conduit which interconnects the interior of the enclosure wi th the exterior. The air conduit should provide a sur- face area in contact with air in excess to that provided by the diaphragm alone. Preferably it has a convoluted shape and may be either helical or formed from an interconnected series of substantially concentric circles. In a preferred embodiment the baffle forms a framework between two membranes, one of which membranes is open centrally to allow access to the centre of the baffle.
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