Ground Zero GZHW 38XSPL-D2

15″ high quality SPL subwoofer with alumiunum cast basket and reinforced paper cone 15″ high quality SPL subwoofer Klippel® optimized Reinforced paper cone Long stroke compound surround Solid aluminum cast basket 75 mm / 3″ copper voice coil 2-layer Polycot spider IMPP dust cap with 3D structure logo Model High-Quality SPL subwoofer Power Handling (RMS/SPL.) 1500 / 3500 Watts Impedance 2x 2 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..