the box pro A 218 LA Subwoofer, Active Double 18"" Subwoofer, With 4"" voice coil, Class D amplifier, Power: 2x 2000 W, Frequency response: 36 - 100 Hz, SPL max.: 141 dB, 4 Presets: Standard, InfraSub, Cardioid or User, Network connection, XLR input and output, PowerTwist input and output, Dimensions: 1215 x