I have 2 of these in a custom sealed box wired to a Hifonics BRZ2400.1D @ 1 ohm and they SLAM! The bass sounds really good and it'l shake everything around you. All of my windows need to be resealed because the bass knocked them loose. Everyone who gets in my car is impressed at how good it sounds. If i could i'd try them out in a ported box but this sealed box sounds so good i might just keep them this way.