''400 W continuous program power capacity 64 mm (2.5 in) aluminium voice coil 60 - 4000 Hz response 98.5 dB sensitivity Neodymium magnet allows a very light yet powerful motor assembly '' ''SPECIFICATIONS Nominal Diameter: 250 mm (10.0 in) Nominal Impedance: 8 Minimum Impedance: 6.2 Nominal Power Handling1: 200 W Continuous power handling2: 400 W Sensitivity (1W/1m)3: 98.5 dB Frequency Range: 60 - 4000 Hz Voice Coil Diameter: 64 mm (2.5 in) Winding Material: Aluminium Former Material: Glass Fibre Winding Depth: 12.0 mm (0.47 in) Magnetic Gap Depth: 8.0 mm (0.31 in) Flux Density: 1.25 T '' ''DESIGN Surround Shape: Double Roll Cone Shape: Exponential Magnet Material: Neodymium Inside Slug Spider: Single Pole Design: Straight Pole Woofer Cone Treatment: None Recommended Enclosure: 26.0 dm3 (0.92 ft 3) Recommended Tuning: 67 Hz '' ''PARAMETERS Resonance Frequency: 61 Hz Re: 5.4 Qes: 0.33 Qms: 4.5 Qts: 0.31 Vas: 32.0 dm3 (1