Ground Zero Hydrogen 12″ SPL-subwoofer Features - High power 12” SPL subwoofer - Klippel® optimized - Efficient triple magnet - Massive aluminum cast basket - Reinforced paper cone - 3” copper voice coil - High-Roll sandwich surround - Double spider Technical data Model: GZHW 30SPL Diameter: 300 mm / 12″ Mounting diameter: 315 mm / 12.4“ Mounting depth: 198 mm / 7.8“ Voice coil: 75 mm / 3” copper voice coil Cone: Reinforced paper Power Handling: 3000 W SPL Power Impedance: 2 x 1 Ohm SPL: 85 dB Xmax: 45 mm / 1.77″ Fs: 35.4 Hz Qts: 0.44 Vas: 15.8 L / 0.56 cu.ft. Box recommendation vented: See owners manual Box recommendation sealed: See owners manual
