Ground Zero GZUW 10SQ-D2

25 cm / 10″ SQ Subwoofer 450 WRMS Rec. amplifier power 300-600 Watts ( rms ) 2 x 2 ohm 50 mm / 2″ copper voice coil Reinforced paper cone Audiophile POLYCOT spider Fs 40.2 Hz Qms 13.60 Qes 0.56 Qts 0.54 Vas 21.8L Le 1.95 mH Mms 122.2 gr Bl 14.83 Xmax 20 mm Effiency 86 dB Outer diameter 262mm Mounting cut out 236mm Mounting depth 148mm.