3 ZV6-18 EZ (21cf 32Hz)DIY BLUEPRINT FOR 3 ZV6-18 SUBWOOFERSVOLUME: 21cf netTUNING: 32HzPORT AREA: 331.69in^2(15.8in per cube)DIMENSIONSWidth: 48inHeight: 25-1/2inDepth: 48in$15.00PriceAdd to CartBuy Now