Ground Zero GZHW 20XSPL-D1

8″ subwoofer 2x1 ohm voice coils 2.5″ copper voice coil Mounting diameter 187 mm Mounting depth 145 mm Aluminium cast basket Klippel optimized triple magnets Cone Reinforced paper Power Handling 700 W RMS, 1500 W SPL Power Sensitivity 80 dB Xmax 40 mm Fs 38.3 Hz Qts 0.381 Vas 4.77 L.