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您看数据手册举得这个例“If a flat bass response is required down to 20 Hz the recommended cut-off frequency is a tenth of that,2 Hz.表2 lists the recommended ac-couplings capacitors for each gain step.If a -3 dB is accepted at 20 Hz 10 times lower capacitors can used – for example, a 1 μF can be used”
频响曲线有个平坦响应区域 flat response 和-3dB处，响应曲线是个斜坡，不是垂直上去的，所以说不能说低于100Hz的音频都不会进入，可以说低于100HZ的音频幅值有一定程度的衰减。
