Ground Zero GZNW 18SPL-Xflex 545.44 EUR Available BUY Article Number: GZNW 18SPL-Xflex Share Information Reviews - 18″ subwoofer - Nuclear SPL Xflex - 2x1 ohm - 3″ voice coil - power handling 3000 W RMS, 6500 W Peak - recommended ported enclosure 120-200 liter NET tuned to 28 Hz - fs 26 Hz - vas 159.2 liters - qts 0.527.