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FilterPro设计带通滤波器需要如何设置?

带通滤波器设计要求:50~11000hz为带通信号,放大倍数为40倍(32dB),带通外的信号需要-40dB/十倍频程的衰减。

我的设置为:中心频率:(11000-50)/2=5475 通带带宽:11000-50=10950 阻带带宽:11000*10=110000 衰减:-20dB/十倍频程。请问我的设置哪里错了?