dB Technologies DVA S 20 dp - active subwoofer with 2x 18" drivers, 4" voice coil, frequency response: 25Hz-150Hz, 138dB maximum SPL, internal class D amplifier, 2000W (RMS), active crossover with switchable frequency, XLR in/out, Neutrik Powercon connector, includes slave out. Dimensions: 1100 x 580 x 700mm. Weight: 74kg. Optional blue wheels available.