I work at a high school auditorium and record the sound to CD from a number of performances . My question is this , why do the mics I'm using work well for recording , but not for sending the signal through the amps and speakers and into the house ? I have two Audio-technica choir mics , 835's I believe , in the house about 25 feet in front of the stage ,and about 15 feet above it . I send the signal from those mics to a pre-fade aux out and into a CD recorder and can even record people talking in a normal tone . But when I try to put the signal from my recording mics into the mix , I have to turn the gain up so high I begin to get feedback . I'm using a Spirit 4+2 board , going to an amp rated at 700 watts output with a 4 ohm load , The speakers are rated at 250 watts RMS and I'm running the amps paralled with 2 speakers on one channel and one speaker on the other . Just curious , thanks .