Diameter: 257 mm / 10.12“ Mounting diameter: 228 mm / 8.98“ Mounting depth: 150 mm / 5.9“ Voice coil: 2.5″ Copper Cone: Reinforced paper Power Handling: 800 W RMS, 1200 W SPL Power Impedance: 2 x 2 Ohm SPL: 82 dB Xmax: 30 mm / 1.18″ Fs: 44.3 Hz Qts: 0.749 Vas: 9 L Recommended sealed enclosure: 20-35 liters Recommended ported enclosure: 38-50 liters.