4 NSv5-15 EZ (17cf 32Hz)DIY BOX PLAN FOR 4 NSv5-15 SUBWOOFERSVOLUME: 17cf netTUNING: 32HzPORT AREA: 271.88in^2(16in per cube)DIMENSIONSWidth: 48inHeight: 21-3/4inDepth: 48in$15.00PriceAdd to CartBuy Now