I realize it is hard to explain over a computer how to set EQ's. But would it be possible for someone to try to explain how to correctly set them. Our school has a very large auditorium, and we get very bad feedback. We know that some of the problem is that the chorus uses mics in the pit. Which when they are in the pit they are in front of the subs. We have a Mackie cfx-20, and the only eq we have in the one in the board. I've heard that you can set the eq according to the pitch of the feedback. But I don't know much more than that. I sincerely thank you for any responses!!