The second-order harmonic can change the Normalized Impedance of the resonance cavity, and cause the distortion of Frequency Response;
二次谐波可使谐振腔归一化阻抗发生变化，导致强声发生器频率响应曲线失真；
The second-order harmonic can change the Normalized Impedance of the resonance cavity, and cause the distortion of Frequency Response;
二次谐波可使谐振腔归一化阻抗发生变化，导致强声发生器频率响应曲线失真；
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