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低档双声道音响设备,一般都缺少丰富厚实的低音,听起来总感到“不过瘾”。如果用简单易装的低频反馈电路,低音频可得到大幅度的提升。具体方法见附图,从扬声器端取出放大了的音频信号,经低通滤波(滤除200～300Hz以上的高音频)后,再送回前置级输入端,在原信号内叠加一个低音信号,功放输出端就会有较大的低音功率输出。
Low-end two-channel audio equipment, are generally lack of rich thick bass sounds always feel “not fun.” If using simple and easy to install low-frequency feedback circuit, bass frequency can be greatly improved. Specific methods, see the attached drawings, remove the amplified audio signal from the speaker side, the low-pass filter (filter out more than 200 ~ 300Hz high audio), and then back to the preamp input, the original signal superimposed on a bass signal, amplifier The output will have a greater bass power output.