MACKIE THUMP 118S. Active subwoofer with 1400W Class D amplifier, 18" Woofer, integrated DSP with 4 selectable high-pass filter modes (Flat, Deep, Punch, Variable), variable crossover frequency, polarity inversion switch, stereo/mono switch, variable level control from -6dBu to +6dBu, maximum SPL of 132Db. It features stereo XLR inputs, full range stereo XLR output, High Pass stereo XLR output
.



