Mackie Thump 118s, Active 18'' Bass Reflex Subwoofer, Power: 1400 W Class-D, Maximum level: 132 dB, Frequency range: 30 - 150 Hz, Road-ready construction, Stereo inputs and outputs: XLR, Full-range and high-pass outputs, Variable crossover, 4 Voicing Modi: Flat, Deep, Punch, Variable, Stereo or mono sum for use with one or two subwoofers, Volume control from -6dBU to +6dBU, Polarity reversal switch, Front LED on/off, Integrated M20 flange, Dimensions: 533 x 528 x 610 mm, Weight: 30.2 kg, Colour: Black