Ground Zero GZUW 12SQ-D2

30 cm / 12″ SQ Subwoofer 600 WRMS Rec. amplifier power 4-800 Watts ( rms ) 2 x 2 ohm 50 mm / 2″ copper voice coil Reinforced paper cone Audiophile POLYCOT spider Fs 39.8 Hz Qms 14.38 Qes 0.70 Qts 0.67 Vas 39.4L Le 1.81 mH Mms 159.4 gr Bl 15.19 Xmax 20 mm Effiency 87.2 dB Outer diameter 315mm Mounting cut out 284mm Mounting depth 157mm.