Impedance: 16 ohms Power Rating: 50W Frequency Response: 70Hz-5kHz Voice Coil Diameter: 1.75", 44.5mm Depth: 5.1", 130mm Coil Construction: Copper voice coil Magnet Composition: Ferrite magnet Cone composition: Hemp Cone Ö Nominal Basket Diameter:12", 304.8mm Sensitivity: 102 Magnet Weight: 38 ounce Core Details: Non-vented core Coil Former: Paper former