michael chuaAugust 22, 2017HIFI DRIVERS8137A, Carbon, Kevlar, Usher, Woofer Usher 8137A Thiele & Small Ported Box=100 liters. F3=30Hz Ported Box=55 liters. F3=40Hz Ported Box=45 liters. F3=40Hz Ported Box=35 liters. F3=47Hz Sealed Box=35 liters. F3=55Hz Sealed Box=55 liters. F3=55Hz, Q=0.71 Bandpass Box=55 liters. F3=40Hz-105Hz
