If you all are wondering what kind of subwoofer this is it is a Massive Audio Hippo XL 122. 2000 w RMS 4000 w Max, 3 in voice coil, Dual 2 ohm and the magnet is a 350 Oz magnet. you can also buy the subwoofer on massive audios website (www.massiveaudio.com) or you could buy the subwoofer in Amazon