Boxed subwoofer plexiglass subwoofer system bandpass subwoofer diameter 300 mm diameter inches 12 inch max performance 1200 watt nominal load 500 watt shape box noise level 93 db min frequency 26 hz max frequency 250 hz impedance 2 x 4 ohm weight 27 kg width 515 cm height 39 cm depth 31 48 cm