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当距离3m时，引脚9号的放大信号SOUT脉冲峰值在2.5V左右，当距离10m时，脉冲峰值在2V左右，当距离为15m左右时，SOUT信号就完全收不到了，这个合理吗？感觉不应该啊，增益等级为8，请解释或可能的原因
这个是声纳，不是音频的应用。
那去哪个区问？
