本文阐述了在低频段闭箱上扬声器轴向远场声压频响平坦时，分别作用于扬声器阻尼、质量和弹性三元件上的力，以及这三个力与频率的关系以及这三个力间的相位关系．根据这些关系，提出了一种处理声频信号电压的电路原理．该电路将声频信号电压处理为分别与上述作用于三元件上的力相对应的三个信号电压，这三个信号电压相加后，再馈于扬声器，可拓展其低频响应 This paper describes the forces acting on the damping, mass and elastic elements of the loudspeaker, respectively, as well as the relationship between these three forces and the frequency and the three forces Between the phase relationship. According to these relationships, a circuit principle for processing the audio signal voltage is proposed. The circuit processes the audio signal voltage into three signal voltages respectively corresponding to the above forces acting on the three elements, which, when summed together, are fed back to the loudspeaker to expand their low frequency response