PA Midwoofer Driver Diameter - 321 mm Power - 400 W Voice coil diameter - 50 mm Impedance - 8 Ω SPL - 96 dB Fs - 55 Hz Qts - 0,72 Vas - 81 L Cone material - Modified Cellulose Recommended enclosure - Bass - Reflex 45 L @ 60 Hz or 40 L Closed