Low-frequency Driver Components 12" Anodized Aluminum Cone Subwoofer; Recommended Amplifier Power 250W RMS; Sensitivity 86dB (2.83V @1M) Without Transformer; Voltage Gain 70V; Weight 66.4 lbs / 30.1kg; Dimensions (H x W x D) 34.6”/18”/35” (87.8cm/45.5cm/88.7cm); Frequency Response (+/- 3dB) 25Hz – 100kHz @-3dB; Transformer Taps 31.75W, 62.5W, 125W, 250W; Impedance 6 Ohm Without Transformer