Ground Zero Hydrogen GZHW 25-D2

Model High-Performance Subwoofer Diameter 25 cm / 10″ Power handling (RMS/SPL) 1200 / 2500 Watts Impedance 2x 2 Ohms Efficiency 83 dB Power recommendation 800 – 2500 Watt Voice coil 63 mm / 2.5″ Copper Cone Reinforced paper Max. Excursion (Xmax) 45 mm / 1.77″ Mounting Ø 238 mm / 9.37″ Mounting depth 178 mm / 7.01″ Resonance frequency (Fs) 41.8 Hz Overall quality (Qts) 0.487 Equiv. air volume (Vas) 8.53 L / 0.30 cu.ft.