低频滤波器和低音单元的相互作用

Interaction of Low Frequency Filter & Woofer

在三分频,四分频音箱制作和调试中,人们经常发现在55～120 Hz的低频段幅频响应曲线有几个分贝的提升,影响了放音音质。揭示了此时分频器(低频滤波器)所接的扬声器单元是容性负载才造成了幅频特性上不希望的声压提升。给出了频率比值的概念,用以判断低频峰值出现的可能。最后给出了几种实用的解决方案。希望对三、四分频的音箱设计者有效克服55～120 Hz处低频响应隆起有所帮助。

In the building ＆ debugging for the 3 -way, 4 -way loudspeaker, it is found that there is few dB promoted in low frequency of the frequency response, which affect the sound reproduction quality. It is intended to explain this phenomenon, re- veal the capacitor character load in the driver connected to the crossover （low frequency filter） caused the unexpected sound pres- sure promotion on the amplitude - frequency characteristic. The concept of the frequency ration is described, to determine the occur- rence po^ibility of the low frequency peak. While there are some practical solution offered.