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They only showed the 18W3 cause that's the only one they make anymore. The 12's and 15's come in the v2. The RMS rating for a 15W3 is 400 watts, but I know it will take more than that. The 15W3v2 up'd the power handling to 500 watts, but again they will take more than that although really not needed.

you will find the JBL 1200.1 on Ebay pretty easily... id still say the JL 500/1 if you can afford it, ive heard three 12" W3's on a 500/1 in a ex cab Dakota and it was damn loud, and ive heard two 15" JL W0's on a 500/1 and it was also loud, either way you could give em their rated rms(continous power handling) and be very happy. as long as they are in the recommended box.

Would 2 15" JL w3 subs sound good in a Silverado extended cab? Would there be enough room?

Or sould I get 2 12's?

you can most likely fit 2 15's if you dont care about not having any space for luggage or passengers back there. Just measure how much room you have w/ the seats pushed all the way back, from the seatback to the back of the cab and see how much room you have. Plan your system around that. 2 15's would be sooooo f!@#$n loud in the back of a truck.
TEDD

i think you should go to a shop since you arent too sure what you should do, have them give you an idea of what they can do for a box back there and other ideas. stick with the JL's if they try and tell you to go with another brand, if the do infact suggest other brands, check the FAQ's and then the Good Bad list... you will be happy with any JL setup so you should be good to go already.. 15" W3's would be damn loud also..

I am going with the 12" JL's. I need a little bit of extra room.

you should like them also.. i hope it works out for you, let us know how it goes and if you have any questions at all just ask and we will surely help you the best we can!!!!

For the 12"'s the rws is 300 but the max is 600. Would a single JL 500.1 work as an amp?

The 15 W3 had far more xmax over its 12" counterpart!