Churches. Feedback. Rotten EQ. Grahh! (Begin rant, skip to last paragraph to dodge) The shape of the Church mixer's 10-band EQ gets worse every week, I tell you. Notches 1 and 2 are down for low end rolloff. 4 and 5 are down to fight a lovely ringing, 7 is down, 8 is down to combat sibilance, 9 and 10 form a nice high end rolloff. I could probably do away with the rolloffs but my problem lies around the 400-600Hz range. The EQ bands are 315 and 630Hz and somewhere between them lies the ringing. So both have to go a few dB lower, taking with them the core of the sound. I'm thinking that I should blast some (pregenerated) pink noise out of the speakers, and record the radio mic to create an impulse - to see if it shows the problems. Will that work?