Glad to see some experience chiming in. The efficiency of those speakers says volumes about their design for SPL. 500watts is a ton of power. People don't seem to realize that these days. You can cause ear damage with a good clean 5 watts.

Throw in those DD's and you might have fixed your power problem Matter of fact...trade in that kicker for a sundown audio SAZ-1000d or so. I've heard some people switching over(from kicker) had cleaner, louder speakers and the head light dimming was gone. Electricity is a neat thing.