We play a charity gig every year that involves letting the organizers and guest speaker use our PA. Unfortunately, the room is a giant glassed-in pavillion with a concrete floor, and the acoustics are terrible. It's not a huge deal when we are singing while playing, but trying to understand someone who is talking into the mic is really difficult. Each year the crowd seems to get more impatient with the situation, to the point that last year the guest speaker gave up on the mic altogether and simply yelled his speech. He happened to be a college basketball coach, so he projected pretty well on his own; but this year will be someone else, and I'd rather do what I can to minimize the issue and prevent the crowd yelling "we can't understand you, fix the sound!" again. Our PA setup is a 200w powered mixer type combo into two JBL speakers (horn + 12" woofer in each, I believe) that are set up on pole stands. We also run a few wedges for monitors. Is there anything physical I can do, or is there a specific EQ I should try? Maybe just boost the mids and cut the lows and highs?