I use a Yorkville system..2/ 12" w/horns on poles[550 watts each] and a 600 watt subwoofer...I set the roll off at 100 on the 2 cabinets..The bottom ..you have to experience this set up....teriffic..
I use a Mackie board[CFX12], sending the mix to a sum out instead of the sub out//this allows me a volume slider to control the sub woofer, and the mains for the 12" pair..