im gonna have to say 4 L5s.. they get pretty **** loud too //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
i think the subs are similiar enough that by this point it will be more about the cone area advantage youll get with the 4 12s.. but both will be loud, and i doubt either will be a whole lot louder than the other, so i say pick more based on the space available and cost, and other things liek that.