Here’s the process we used at my church. Probably not the best way but it worked for us. On our QU-24, we output pink noise into our Bose array at a rather high level. We set a reference mic plugged into the board, but not assigned to L+R, on a ladder close to the speakers. With the mic channel pafl’d, and LR selected, we brought up the graphic EQ on the fader flip. Using the fader leds we could slowly bring down the peak frequencies one at a time until the led peak indicators never stayed on one frequency (the red led danced randomly across all the frequencies). We then moved the mic to a central pew location and fine tuned the graphic EQ. This gave us a flat reference. We then used the parametric EQ to balance out the EQ using different music tracks.
.
