The S15L5s are 750/1500, and S15L7s are 1000/2000. I mean, of course there's a 150 watt difference, but both SPL are very good. The new CVXs hit the same as the L7s but sound 10x better, SQ. Honestly though, between the L5 and L7, it's not a whole world of a difference!
I gave you the 12" specs! ... Dontrell gave you the 15" specs... They might sound bigger in SQ * 1 cause they are circle * ... But they don't put out as much bass, and they surely don't get louder than the L7...