Thanks everyone...First of , Big Jon I am only using 1 12btl at the moment . that's why I am asking if I am over powering the Fi ? thanks mhayes before doing anything I'll do that. Steve, my Idiol Steve , my gain is set a half , and the power dosn't seen to shut off on my amp...all the light on the amp stayed on...it's the sub , at first it hits hard then it start lagging and after a minute nothing !???