nothing beats them! www.mmatsproaudio.com
only problem, is that there almost double the price as JL, but they are completely warrantied..
if u blow them for playing them too loud, or for whatever reason, THEY REPLACE THEM FOR FREE, 100%!!!
u cant beat it, ive never had to return mine, theyve never broke, but a friend blew one of his, and he got a new one within a week, free!
These subs hit hardest, can handle the most power.... id take them anyday over JL