Model High-Performance SPL subwoofer Diameter 38 cm / 15″ Power Handling (RMS/SPL.) 3500 / 7000 Watts Impedance 2x 2 Ohms Efficiency 88.5 dB Power Recommendation 2000 – 7000 Watts Voice Coil 75 mm / 3″ CCA Membran Layout Reinforced paper Max. Excursion (Xmax) 80 mm / 3.15″ Mounting Ø 358 mm / 14.09″ Mounting Depth 269 mm / 10.59″ Resonance Frequency (Fs) 36.0 Hz Overall Qaulity (Qts) 0.52 Equiv. Air Volume (Vas) 54 L / 1.91 cu.ft..