michael chuaMay 8, 2018HIFI DRIVERS8", Pioneer, W20GR30, Woofer Pioneer W20GR30 Thiele & Small Parameters Ported Box=20 liters • Fb=45Hz (DATS T/S) Ported Box=25 liters • Fb=40Hz (DATS T/S) Ported Box=35 liters • Fb=40Hz (DATS T/S) Updated on Oct 30, 2023