I'm gonna be getting a kicker zx1500.1 in a few days and ive heard that amps run at higher impedences are more efficent. I don't really understand how to read how efficient it is from the information on it, but i'm just wondering, is this a pretty efficient amp, bc i'm kinda lazy/poor and i have a stock 135 alt and stock like 600 batt. BTW am i risking damaging my amps/alt/battery?