Don't buy Rockford Fosgate, its crap. Its just over rated and will blow in a few weeks trying to run an L7, especially a 15. I had a Kicker KX600.1 on my 12" L7, the RMS rating was 745 so it was plenty to power it. As for the 15 you may wanna look at the 1200.1. But if you are gonna buy the L7 stick with kicker on the amp as well. They are made to complement each other. And believe me that combo will blow a lot of systems out of the water!