Just to give some info to the origional post...The first system that I had was JL Audio 12w3 D4 (Wired in paralell) in a sealed box powered with a Soundstream Angina Amp...It wouldn't knock down buildings or anything but it sould sure rattle the hat off my head. I was really impressed with what that amp would do! Anyway, just my .2 cents. Hope it helps.