High-Frequency Driver Components 1-inch / 25mm Aluminum dome tweeter with Acoustic Lens wave guide; Low Frequency Driver Components 8-inch / 200mm Aluminum cone woofer; Input Connections Stainless Steel screw terminals; Frequency Range 60Hz - 22kHz -3dB; Recommended Amplifier Power 20 - 80 Watts RMS; Transformer Taps 70V; Crossover Frequencies 2.3kHz; Low Frequency Extension -10dB @ 45Hz, -6dB @ 52Hz, -3dB @ 60Hz; Impedance 70V / 100V 60W variable tap with 8-ohm bypass; Sensitivity 89dB @ 2.83V / 1m; Enclosure Type Sealed; Mounting InvisiBall® mounting system; Finishes Black or White; Dimensions (H X W X D) 15 x 11 x 8.6 in