the box pro TPC25, Active Crossover, 2-Way stereo / mono sub, Ex-factory 125 Hz highpass and lowpass filters, Selectable 80 Hz, 125 Hz, 160 Hz crossover frequency by internal jumper, 24 dB / octave Linkwitz-Riley filter, ""Limiter on"" LED per channel, Limiter threshold adjustable, Electronically balanced XLR inputs and outputs, Ground Lift, Weight: 2.5kg, Dimensions (H x W x D): 43.8 x 483 x 166 mm, Format: 19""/ 1U