SPECIFICATIONS Driver Complement: 1" Concave Diamond Diaphragm tweeter 7" Concave Ceramic Midrange 2 x 13" Nomex Kevlar Composite Woofers All drivers utilize proprietary neodymium magnetic technologies. Sensitivity: 90 dB Impedance: 4 ohms nominal Frequency Response: 20Hz to 100kHz Recommended Amplifier Power: 50 to 500 watts Wiring Methods: Two position binding post Dimensions: 60" (152 cm) high 14.5" (37 cm) wide 17" (43 cm) deep Weight: 175 pounds each (80 kg each)