SPECIFICATIONS Driver Complement: 1" Concave Carbon/Glass Tweeter 3 1/2" Concave Ceramic Dome Midrange 2 x 7.5” Nomex Kevlar Composite Cone Woofers Sensitivity: 89 dB Impedance: 4 Ohms Nominal Frequency Response: 24Hz to 50kHz Recommended Amplifier Power: 25 to 400 Watts Wiring Methods: Two Position Binding Post Dimensions: 44" (112 cm) High 10" (25 cm) Wide 16" (41 cm) Deep Weight: 86 Pounds (39 kg each) each