michael chuaMay 8, 2018HIFI DRIVERS12", 30-733A, HPM 100, Pioneer, Woofer Pioneer HPM-100 (30-733A) 12″ Woofer Thiele / Small Parameters Ported Box 55 liters. F3=40Hz Ported Box 75 liters. F3=37Hz Ported Box 100 liters. F3=33Hz Sealed Box 45 liters. F3=53Hz, Q=0.75 Sealed Box 55 liters. F3=53Hz, Q=0.69 Sealed Box 75 liters. F3=54Hz, Q=0.62 Bandpass Box 60 liters. F3=40Hz-115Hz