it has roll-off...
here's the break down
i will list the switches that should be down for the particular freq. roll-off
16Hz--2,3,4
69Hz--1,4
95Hz--1,3
107Hz--1,3,4
160Hz--1,2
195Hz--1,2,4
888Hz--1,2,3
that means switches down on both sides, one side for each channel
have you used those mics yet??