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1. 双转单的运放建议评估INA163,INA217,PGA2500。更具体的内容请到TI官网->应用->专业音频混合器,网址www.ti.com.cn/.../pro_audio_mixer
2. AIC32内部有两个加法器,会把输入信号做和,对4个输入口有效。不过还有两路输入可以不受这两个加法器的影响,你可以试试看。