Specifications: 10”/25cm 600/400 Watt 4 ohm impedance 2,5” voice coil Vented box 30-35 l or sealed box 20 Cone: PFP Surround: Rubber Basket: Aluminum Spider: Nomex Coil former: Aluminium Dust Cap: Paper Power: Pe 400/600 RMS/Nom DC resistance: Rdc 3,4 Ω Nominal impedance: ZN 4 Ω Resonance frequency: fs 30 Hz Voice coil diameter: 2,5 inch X-Max: +/- 12,5 mm Mechanical Q factor: Qms 7,34 Electrical Q factor: Qes 0,49 Total Q factor: Qts 0,46 Moving mass: md 98,57 g Effective piston area: Sd 346 cm2 Mechanical resistance: Rms 2,77 kg/s Compliance: Cms 0,28 mm/N Force factor: BL 10,9 Tm Equivalent air volume: Vas 47,25 dm3 SPL 2,83V/1m: 90 dB External diameter: 260 mm / 10,24 inch Installation diameter: 236 mm / 9,29 inch Installation depth: 149 mm / 5,87 inch Magnet diameter: 155 mm / 6,10 inch