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TPA3123D2输出声音很小,要耳朵贴近喇叭才听得到

实际测试输入电压为15V,喇叭为4Ω,测试时直接接上电脑的音频输出,喇叭声音非常小,基本听不到,

还有芯片输出的OUTR/OUTL的电压正常应该是多少?