I personally don't care for JL, blown way too mamy of em. They are loud though, but don't beat on em with a lot of power for extended time..they will release the factory smoke! I have a Eclipse aluminum cone 15, and i am putting 2 Directed 1100D's to it. Thats 2200 watts to that sub, and i can pound the living shit out of it, and no damage at all. Damn, its a bad ass sub! I have 2 of em, but only got the 1 in now to keep the weight down. When i had them in my grand prix, i was hitting 151 db's in a ported box, and that was helllaa loud!
I have 4 db dragracing trophies from that set up. I miss that deafining bass!

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)