the box pro DSP 18 Sub, Active Subwoofer, Equipped with: 18"", Power: 800 W RMS, 2400 W peak, Maximum level: 128 dB, Frequency range: 30 - 150 Hz, Connectors: XLR (L+R) in, XLR (L+R) through and XLR (L+R) crossover out, Groundlift shape and phase switch, Switchable low-pass filter 90/120 Hz, M20 screw thread for spacing rod, Dimensions: 610 x 680 x 745 mm, Weight: 39 kg, Suitable protective cover: Article number #451970# (not included)