Specs Tweeter driver : 1 Inch midrange driver : 4 Inch woofer driver : 2 x 6.5 Inch Frequency Response : 65 - 20000 Hz Nominal Impedance : 4 Ohm Recommended Amplifier Power : 20 - 150 Watt Sensitivity : 88 dB Magnetic Shield : Yes Dimension (WxDxH) : 26 x 8.3 x 7.6 Inch Weight : 10.8 kg