I'm looking for subwoofers for my big 7200W system. It will be outdoors, and apparently car subs and home stereo subs too suffer from lousy freq. response whe used outside. But no PA subs have the low freq. response and Xmax that I need for my system. I'd like to use ALUM12X's, with their 31mm Xmax and deep bass response. Each one needs to handle only about 112.5W RMS, but I want to go LOW, like 10Hz or lower. I'm trying to combat the problems car subs face when outside the cabin without using so much EQ. Maybe I could try horn loading them, bass reflex or bandpass encolsures or something. Or maybe I could install them in boxes built into the side of a large partly open enclosure the size of a small vehicle cabin, simulating running them in a pickup with a door open. Any thoughts or ideas?