Fluid Audio F8SW - 8" Active Subwoofer, White 200 Watts of class D power with switching power supply Frequency response: 30-200Hz Input impedance: 20k ohms balanced, 10k ohms unbalanced Input sensitivity: 85mV pink noise input produces 97dBA output SPL at one meter with Volume control at maximum Power: factory programmed for either 100-120V ~60Hz, 220-240V ~50Hz Protection: RF interference, output current limiting, overheat, turn on/off transient, subsonic filter, external main fuse