Ground Zero GZHW 38XSPL-D1

Model High-Quality SPL subwoofer Power Handling (RMS/SPL.) 1500 / 3500 Watts Impedance 2x 1 Ohms Efficiency 87 dB Power Recommendation 1500 ? 3500 Watts Voice Coil 75 mm / 3? Copper Membran Layout Reinforced paper Max. Excursion (Xmax) 45 mm / 1.77? Mounting Ø 360 mm / 14.17? Resonance Frequency (Fs) 36.3 Hz Overall Qaulity (Qts) 0.52 Equiv. Air Volume (Vas) 32.8 L / 1.16 cu.ft..