1 X-18 EZ (7cf 32Hz)DIY BLUEPRINT FOR A X-18 SUBWOOFERVOLUME: 7cf netTUNING: 32HzPORT AREA: 111.63in^2(15.95in per cube)DIMENSIONSWidth: 36-3/8inHeight: 22inDepth: 29in$15.00PriceAdd to CartBuy Now