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All the other posters have the real answers, but sometimes that just can’t be done. We have children’s choirs in front of the mains and are forced to use EQ to notch out the offending frequencies. Like someone else said, use an RTA. If I read the release notes correctly, there is an RTA with the GEQ. During a sound check, SLOWLY bring up the fader (or gain) until you just hear feedback. The RTA should peak and you can take that frequency down a little. After that you might find another. We can usually get much better gain before feedback after dropping a couple of the offending frequencies.

Rick Kohrs
Good Shepherd Lutheran Church – West Campus
Verona, WI