Ground Zero Hydrogen GZHW 30-D1

Model High-Performance Subwoofer Diameter 30 cm / 12″ Power handling (RMS/SPL) 1500 / 3000 Watts Impedance 2x 1 Ohms Efficiency 85 dB Power recommendation 1000 – 3000 Watts Voice coil 75 mm / 3″ copper Cone Reinforced paper Max. Excursion (Xmax) 45 mm / 1.77″ Mounting Ø 284 mm / 11.18″ Mounting depth 198 mm / 7.80″ Resonance frequency (Fs) 39.1 Hz Overall quality (Qts) 0.56 Equiv. air volume (Vas) 17.6 L / 0.62 cu.ft.