SPECIFICATIONS Driver Complement: 1" Concave Carbon/Glass Tweeter 3 1/2" Concave Ceramic Dome Midrange 2 x 9” Nomex/Kevlar Composite Cone Woofers Sensitivity: 89 dB Impedance: 4 Ohms Nominal Frequency Response: 24 Hz to 50 kHz Recommended Amplifier Power: 25 to 400 Watts Wiring Methods: Two Position Binding Post Dimensions: 46" (117 cm) High 11" (28 cm) Wide 17" (43 cm) Deep Weight: 114 Pounds (52 kg each) each