With the development of digital audio technology, the low frequency response of many audio sources has reached or exceeded the lower limit of human hearing of 20HZ. In order to more completely reproduce the bass information contained in the program source, the traditional left and right speakers are powerless. The way to make up is to add a speaker with a built-in subwoofer Suzhou amplifier, which is specially designed for subwoofer playback, and cooperates with the original left and right channel speakers (especially the low frequency combination of poor frequency response) to form a 3D system Get immediate sound effects and lay the foundation for future multi-channel home theaters.
The following introduces the subwoofer playback system. It only needs to be connected to the speaker output of the original audio equipment to form a 3D system. The circuit is shown in Figure 9-22.
Take the left and right channel signals of the output terminal of the field speaker of the voluntary audio equipment, mix them with R1 and R2, and buffer them with ICIA, and then send them to the high and low pass filters.
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