Impedance: 8 ohms Power Rating: 225W Maximum Power: Frequency Response: 70Hz-3.5kHz Voice Coil Diameter: 2.5", 63.5mm Depth: 6.1", 155mm Coil Construction: Copper voice coil Magnet Composition: Ferrite magnet Cone composition: Paper Cone Nominal Basket Diameter:15", 381mm Sensitivity: 101.5 Magnet Weight: 56 ounce Core Details: Non-vented core Coil Former: Polyimide former