what are you nuts?!?!?! if anything thats not enough power and if youve been in the buisness youd know that underpowering a sub is worse than overpowering. the L5 is 600 rms. sooooo he should prolly have an amp that runs at 800 rms and then turn his gains down. cmon, you should be up on this. that way theres no clipping and he wont be starving for power. its not gonna rattle your shit either. you can adjust all kinds of stuff between the headunit and your Xovers.