Seems as though you need more woofer... either more than one pair of Sub1500s, or simply more woofer. Personally I do not like the sound of the 2242 as much as I like the Sub1500 or W1500H, but they are nearly indestructible. In addition to having a different sound, they also require much bigger boxes.
The problem with smaller boxes is the higher excursion needed from the the woofer. This is a likely cause of failure.