Hi there, I have 6 x pd1850 that i am building into C subs. 4 x p audio sn 12 b that i plan to make a pair of smt 212s with. Now my problem, I have 4 pd 156 drivers to go in the middle....... Do i build some simple reflex box's or can some one advise me on some nice horns for the 156's. Also any plans for the sn 12 b that out perform the smt 212 would be wicked.. Thank you to any one that can help an advise me in turning the pile of drivers i have into a lovely sweet sounding rig