QSC KW 181, active 18" Subwoofer, Class D amp with 1000 W, frequencyrange 40 Hz - 112 Hz, 135 dB SPL max, 2x XLR/Jack combi input, 2x XLR out, IEC power connector, adjustable LF Mode, switchable polarity, thermal fan, internal Limiter, M20 pole connector, dimensions: 510 x 595 x 761 mm, weight 40 kg