Subwoofer system help? who can help!?

i have 2 kicker comp subs( the new style) about half a year old. with a carppy box. if u want to know the box go to youtube.com type in joshlowe14. and go to the most viewed or watch both. but i was wondering how i could save power with such a big amp. with my old car you see in the video, its a 95 plymouth(or dodge) neon. i replaced the alt belt 3 times! ugh pain in the ! so if somebody could help me or if u need more info tell me