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通常把频率低于20Hz、人耳听不见的声音叫做次声(Subsonic)。研究结果表明,长时间处于次声环境对人体健康有害,音响设备播放次声不仅无益还容易使放大器和扬声器过载。这种现象在播放音乐时很少出现,因为音乐的最低频率一般都在30Hz以上。然而,在AV影片录音中,为了渲染低音的特殊音响效果,信号的最低频率往往低于20Hz,有时甚至低至5Hz。因此,为了避免次声的危害,有必要给家庭影院自制放大器的超低音通道增加一个抑制20Hz以下信号的次声滤波器。该滤波器接在超低音放大器的输入端,它应大
Usually the frequency is below 20Hz, the human ear can not hear the sound called Subsonic (Subsonic). The results show that, for a long time in the infrasound environment harmful to human health, audio equipment, infrasound is not only beneficial but also easy to make the amplifier and speaker overload. This phenomenon rarely occurs when playing music, because the lowest frequencies of music are generally above 30Hz. However, in AV movie recording, in order to render a special sound effect of bass, the lowest frequency of the signal is often lower than 20 Hz and sometimes as low as 5 Hz. Therefore, in order to avoid the harm of infrasound, it is necessary to add an infrasound filter which suppresses the signal under 20 Hz to the subwoofer channel of the home theater amplifier. The filter connected to the input of the subwoofer, it should be large