产品是蓝牙音响，模拟输出音源，蓝牙输出音频的信号频率是2.48G ，信号幅值大小是全频段，接入功放IC（LM4991），输出双5W直推喇叭，感觉音质高低音不是很理想，中频还好可以接受，想尝试接入前级运算放大器调音，不知道这前级需要怎么来去选择呢？不知道能否有其他方案能够跟好的调节输出的音质呢？
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