1 DD-9918 PRO (6cf 34Hz)DIY BLUEPRINT - DD AUDIO 9918 SUBWOOFERVOLUME: 6cf netTUNING: 34HzPORT AREA: 95.63in^2(15.94in per cube)DIMENSIONSWidth: 48inHeight: 22-1/16inDepth: 24in$25.00PriceAdd to CartBuy Now