Active subwoofer-module for many GROUND ZERO subwoofer boxes 1-channel 2-ohm stable amplifier module with class D circuit, integrated active crossover and bass boost Class D technology Variable active crossover and bass boost Channels 1 Output Power (@ 4Ω) 170 Watts RMS Output Power (@ 2Ω) 280 Watts RMS Output Power (@ 2Ω) 330 Watts RMS Frequency Response 20 Hz – 200 Hz HPF / LPF / BPF ○ / ● / ○ Bass Boost / Phase switch ● / ○ High level input / Auto-on ● / ● Remote ● BIAS Setting ○ Linkmode ○ Dimensions (W x L x H) 85 x 126 x 85 mm / 3.35 x 4.96 x 3.35″