Frequency Response: 100 Hz – 20 KHz Impedance (Nominal): 8 Ohms Sensitivity (1W@1M): 85 dB Maximum SPL: 101.9 dBA Recommended Crossover frequency: 200 Hz Power Handling: 20 W, 50 W (using crossover). Recommended Amp Requirements: 5 - 20 W, 5 - 50 W (using crossover). Drive Unit Complement; 2” Full range micro-driver Overall Diameter: 80 mm (3 1/8 inch) Overall Depth: 96 mm (3 3/4 inch) Cut-Out Hole Diameter: 65 mm (2 1/2 inch) Mounting Depth: 91.5 mm (3 5/8 inch) Fixing Type: 2 x Spring clip fixings Connection: Gold plated "push" type terminals Construction Materials: Steel Bezel, Aluminium Enclosure. Weight: 0.19 Kg (0.42 lb)