| 摘要 |
In electro-acoustic transducers, especially for use in a telephone subscriber's instrument, to reduce the low frequency response of the transducer without increasing distortion one or more holes or tunnels (11) are provided through the diaphragm support member (5), the holes or tunnels coupling the air behind the diaphragm with the air in front. Such holes or tunnels can also be formed by a groove or grooves in the support member, the diaphragm rim then acting in effect as a lid for the or each such groove. The holes or tunnels do not have to be parallel to the plane of the diaphragm, and the idea is applicable to types of transducers other than the moving coil type. <IMAGE> |
