DD Audio 9921 D1

-21? subwoofer - cast frame - 2 x 1 ohm voicecoil - magnet weight 31,7 kg - 4? voice coil diameter - driver displacement: 13 liter - recommended ported enclosure 170-200 liters ( NET ) - power handling 2500 W RMS - peak power handling 10 000 watts - x-max: +- 22 mm - xmech: 92 mm - qts: 0,46 - Fs: 33,65 Hz - Vas: 161,54 liters.