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Podium mics under speakers – very tricky. The podium itself is a fantastic audio reflector that can focus energy onto the mic itself (even it is not directly in the path of the speaker, the lower frequencies – even mids, still hit pretty hard). One thing that has helped is some type of “cushy” or heavy cloth covering on the podium to help absorb some of the energy. Change the angle if possible too. Using a group as discussed earlier and apply GEQ (try the different types) along with an RTA (AudioTools is great) to assist in identify the frequencies is also good. The big problem will remain though in not removing too much “content” so that the speakers voice still sounds close to the actual speakers voice.
Bob
GLD80, AR2412, 2xAR84, Dante