Subwoofers are increasingly showing their importance in modern audio production and home theaters, and new devices and circuits are emerging one after another. Several circuits introduced to you here have better performance, are easier to manufacture, and have a certain representative circuit.
1. Dynamic subwoofer circuit
The STDTD circuit is shown in Figure 9-36. This is an improved Aiwa XBS circuit. Connect it to both ends of the volume potentiometer of the amplifier. The bass increase varies with the volume. For the bass below 85HZ, there is an improvement of 15 ~ 20DB. The basic circuit and access method are: disconnect the signal line at the upper end of the original volume-increasing potentiometer, and connect it to the IN end of this circuit, so that the pre-level signal will be all the way through AL The frequency signal is buffered and sent back to the upper end of the original potentiometer WH. After the other way passes through the Butterworth filter composed of A2 and peripheral components, the bass signal is amplified by A3 and output to the center tap WO of the original potentiometer
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