SPECIFICATIONS Driver Complement: 1" Concave Carbon/Glass Neodymium Tweeter 7" Concave radial magnetic Ceramic Midrange (2) 13" Nomex Kevlar Generation II Composite Woofers All drivers utilize proprietary neodymium magnetic technologies. Sensitivity: 92 dB Impedance: 4 ohms nominal (3.8 ohms minimum) Frequency Response: 20Hz to 45kHz Recommended Amplifier Power: 25 to 500 watts Wiring Methods: Dual binding post Dimensions: 68" high (178 cm) 14.5" wide (37 cm) 17" deep (43 cm) Weight: 260 pounds each (118 kg each)