This is a quote from your you tube video:
"My new system. Blew the L7s. These are DC Audio Lvl 4 18s with lvl 5 coils. Check them out: www.dcsoundlab.com"
Did you have them repaired?
I only had a kicker kx800.2 and i fried it and kicker said it was from voltage drop. I was running stock electrical.
Do what audiofanaticz said and upgrade batteries.