Recommended for professional audio and bass guitar applications as a mid-range. Sealed basket makes this woofer independent of enclosure design. Impedance: 8 ohms Power Rating: 125W Maximum Power: 250W Frequency Response: 400Hz-4.8kHz Voice Coil Diameter: 1.5\" 38.1mm Depth: 3.25\" 83mm Coil Contruction: Copper voice coil Magnet Composition: Ferrite magnet Cone composition: Paper Cone Nominal Basket Diameter:8\" 203.2mm Sensitivity: 100.9 Magnet Weight: 20 oz. Core Details: Vented core Coil Former: Polyimide former- SKU: TBAL5577