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TPA3116D2 带宽问题

Other Parts Discussed in Thread: TPA3116D2

TPA3116D2 工作范围20k-100k,工作电压24V 2A,单端输入,负载为1000欧姆的transducer

按照官网给的特性曲线,gain在这个频率范围内应该不变,但实际测试发现结果呈现钟型曲线,60K处达到最大值

请教原因是什么