DD Audio 612f – 12″ subwoofer – 2.5″ voice coil wound of Made in USA wire – 2x 2 ohms – alucast frame with dd-logos – power handling 1000 W RMS, 3000 W Peak – weight: N/A – mounting diameter: 292.1mm – mounting depth: 187 mm – x-mech: 60 mm – x-max: +- 22 mm – fs: 31 Hz – qts: 0,4075 – vas: 81.16 Liter – recommended ported enclosure: 49-78 liter ( NET ) 4-AI212SLOT Ported enclosure for 2×12″ subwoofer Net volume: 2×40 liters. Port area: 350 cm2 Port height: 350mm Port width: 100mm Tuning frequency: 38 Hz Diameter of speaker hole: 285mm Measurements ( W x H x D ): 930 x 380 x 400.