| 摘要 |
In a first embodiment the loudspeaker has a first diaphragm 3 and a second diaphragm 5. A first electromagnet having a first coil is mounted to the first diaphragm 3 and a second electromagnet having a second coil is mounted to the second diaphragm (5). A driver is provided for supplying an electrical drive signals to the first and second coils so as to generate first and second interacting magnetic fields which drive the first and second diaphragms (3, 5). In a second embodiment the second electromagnet is attached to fixed back plate (135, fig 7). Variants of the second and third embodiments use a permanent magnet in place of the second electromagnet. The present invention also relates to a speaker assembly (45) made up of an array of the speaker devices (figs 6A, 6B). The speaker device can be used in a motor vehicle. |
