Ground Zero GZUW 8CF

20 cm / 8″ SQ Subwoofer, 300 WRMS Rec. amplifier power 2-400 Watts ( rms ) 2 x 2 ohm 50 mm / 2″ copper voice coil Pressed and coated paper cone Carbon dustcap Audiophile POLYCOT spider Vented enclosure Recommended size: 18L net Port: 1 x 7cm Port length: 25cm Tune frequency: 46 Hz Sealed enclosure Recommended size: 8-20L net Effiency ( SPL ): 83dB FS: 57 Hz QTS: 0.7 VAS: 4.8L XMAX: 20 mm Mounting cutout: 181 mm Mounting depth: 108 mm