I have a large outdoor gig to play. We'll be set up on the ground, no stage for this huge charity/car show. I have to cover an area thats a couple of 100 cars big with tunes. Most likely 100's of people...could see a 1,000(guesstimate) Heres what I was going to do. I want to set up 3 mains per side about 25 feet apart, all mono about 6 to 7 feet high, center main staight out and the sides pointing out on an angle to sort of make a 45 degree wedge on each side. Center 2 18 subs right next to each other pointing straight out. The subs will have their own amp. 4 mains will have their own amp right out of the powered mixer and the last 2 mains will be fed a monitor feed from the mixer and have their own amp. Will I be OK or end up having signals fighting each other jacking up the mix? This gig is for our county sheriff. All the BIG wigs from our town and surrounding areas will show. I want it to sound good, look good, etc.. Thanks!