I always thought that cloth accordian surrounds were common for MI drivers for durability reasons to survive transients. In your Rockford subs, have you had any problems with holding surrounds together? How did you decide on the crossover point? I was considering a small/light system with car audio subs under a B-102 (or a pair of B-102's) and there are plenty of choices in 10"/12" that would be easy to carry. Have you tried this?