| 摘要 |
A planar-type loudspeaker (10) incorporating a substantially planar diaphragm (12) constructed from a pre-expanded cellular plastic material, such as polystyrene, in which one or more balancing weights are embedded in a resilient material within recesses formed in the rear surface (26) of the diaphragm (12). The resilient material enables the weights a degree of movement relative to the diaphragm (12), such that the weights can serve a counteractive function to help control the frequency response characteristic of the diaphragm (12).
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