KRK S8G4, Active Studio Subwoofer, Drivers: 8"" glass-aramid composite woofer, Power: 109 Watt - Class D amplifier, Frequency range: 34.5 - 133 Hz, Maximum level: 112.8 dB, SNR: 92 dB, Adjustable crossover frequency, Bypass function via an optional foot switch, Switches for standby function, ground/lift, polarity and input sensitivity, 2 Line inputs and outputs: XLR, 6.3 mm jack and cinch, Foot switch input: 6.3 mm jack, Integrated power supply 100 V AC - 240 V AC, MDF housing, Dimensions (W x H x D): 410 x 279 x 292 mm, Weight: 12 kg