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LM4871 输入、输出端电压不平衡

Other Parts Discussed in Thread: LM4871

之前为解决POP声,测量时发现,LM4871功放IN+/-两端、OUT+/-两端,在上电静态时电压不平衡,暂判断因此出现了更为明显的POP声,若将反馈电阻调小则会小些许(Rf=30K时,输出电压间偏差了0.1左右,有明显的POP声,能感受到喇叭纸盆鼓动、有直流流过)。想请问造成输入处、输出处偏置电压不等的原因是什么?要如何处理、解决?

参考电路:(上述问题确认时已经跳过了U6芯片&断开了R22输入)