Dual 5.25" (133mm) Polycellulose Low-Frequency Woofer; New High Definition Imaging (HDI) Waveguide; 1” (25mm) Aluminum Dome Tweeter; Recommended Amplifier Power 20 – 150W; Freq Resp 75Hz – 40kHz; Sensitivity88dB @ 1M, 2.83V; Impedance 6 Ohms; Crossover Freq 2.6kHz; Dim (W x D x H)469 x 220 x 190mm; Weight17.53 lbs (7.95kg)