back custom made Mackie flyware... my brother made the rigs for me... worked, and sounded great. In addition to the two SRM-450's per side we also had 1 18" sub on the floor per side... crossed over at I believe about 80 or 100. Really big fat sound. I feed the left cluster off one matrix, the right cluster off another matrix, the center fills (at the base of the stage) off one matrix (LCR ya know), the side fills for the choir off another matrix and the subs had their own matrix feed as well.