aliste

I've just bought a battery box with bass roll-off to record live concerts. What level should I set it at? There are seven choices (16Hz, 69, 95, 107, 160, 195, 888). The show I'm planning to record next will be outdoors, in a fair-sized courtyard with buildings on all four sides. I assume it's going to be fairly loud, and I plan to be pretty close to the stage. I'm using a pair of cardioid mics. Also, there are going to be three different acts: a rock group, a rapper, and then Bela Fleck. Would it best for me to adjust the bass roll-off between each set? Thanks!