Size:16.5 cm Type:Midrange Driver Maximum power:300 W Continuous power output:100 W Frequency response:75 Hz to 20,000 Hz Sensitivity:99 (1 W/1 m) dB Impedance:4 Ω Mounting Depth:65 mm Woofer Cut-Out Hole:Φ146 mm Woofer material:Paper Surround:Cloth Spider:Polyester Fibre Voice Coil type:Copper Clad Aluminium Wire (CCAW) Magnets:Ferrite Weight:2.50 (Pair, excluding accessories) kg Accessories:Speaker mounting screws.