I have four of these 15's, and i want to get rid of the two dual chamber mwm's because they are too big. They were being used in a skating rink (about 20,000 Sq. Ft.) I want to build four seperate boxes for each of the woofers to be used as "subs" (Under 100 Hz). The only issue i have is that i have no clue what the volume for my boxes should be, or how to build a box that can effectively disperse the low frequencies across the rink, while remaining LOUD. The only thing that threw me off was how i can build a box for them, when they were designed to run in those MWM's, which are unlike any other box ive seen. Any input would be appreciated.