michael chuaMay 2, 2018Car Subwoofers10", Car Subwoofers, P110S8, P1S8, Punch, Rockford Fosgate Rockford Fosgate Punch P1S8-10 Thiele & Small Parameters Measured Thiele & Small Parameters Recommended for In-Car Use Ported Box 45 liters. F3=33Hz Ported Box 35 liters. F3=33Hz Ported Box 45 liters. F3 = 30Hz Ported Box 55 liters. Fb = 35Hz Ported Box 150 liters. F3 = 27Hz Sealed Box 35 liters. F3=43Hz, Q=0.79 Sealed Box 55 liters. F3=42Hz, Q=0.70 Bandpass Box 45 liters. F3=35Hz-80Hz