4.5" (114mm) Polycellulose Low-Frequency Woofer; New High Definition Imaging (HDI) Waveguide; 1” (25mm) Aluminum Dome Tweeter; Recommended Amplifier Power20 – 125W; Freq Resp 60Hz – 40kHz; Sensitivity86dB @ 1M, 2.83V; Impedance 6 Ohms; Crossover Frequencies3.2kHz; Dimensions (W x D x H)170 x 170 x 285mm; Weight (each) 3.81kg