4500 Watts SPL 12″ high performance SPL subwoofer with aluminum cast basket and Xflex surround 12″ SPL subwoofer Klippel® optimized Reinforced paper cone SPL Xflex surround Solid aluminum cast basket 75 mm / 3″ CCA round wire voice coil 4-layer progressive spider IMPP dust cap with 3D structure logo Model High-Performance SPL Subwoofer Diameter 30 cm / 12″ Power handling (RMS/SPL) 2500 / 4500 Watts Impedance 2x 1 Ohms Efficiency 87 dB Power recommendation 1500 – 4500 Watts Voice coil 75 mm / 3″ CCA Cone Fiber reinforced paper Max. Excursion (Xmax) 60 mm Mounting depth 226 mm Resonance frequency (Fs) 33.9 Hz Damping ratio (Qts) 0.361 Equiv. air volume (Vas) 27.3 L