i had 2 of the jl 12w0 single 4 ohm subs back in the day, and i put them in a large seald box and they did pound! i had people in the back seat of my jeep and they had to have me turn it down. no its was no 20,000 watts or any thing huge but it sounded great especially considering i paid $99 a sub! i still think about if i would have got 4 of them and ran them at 1 ohm what the out come would have been..... but the theory says i would have only gaind 3 db. so is it worth it to put yourself in a higher class (if you compete) just to get 3 db? probably not, but if its street use i guess it has a bling factor....