Folks, I'm stumped. I have a 2000 ford sd that has a JVC HU with 3 pre outs. One pre out goes to a 2 channel sub amp that drives a pair of kicker comp 12s. Second pre out to a 2 channel amp that drives a pair of mtx 6x9s. And finally the 3rd pre outs go to a 4 channel amp that drives 4 mtx 5x7s...