3 SA-15 EZ (9cf 35 Hz)DIY BLUEPRINT FOR 3 SA-15 SUBWOOFERSVOLUME: 9cf netTUNING: 35 HzPORT AREA: 130.5in^2(14.5in per cube)DIMENSIONSWidth: 48inHeight: 20-7/8inDepth: 26-5/8in$15.00PriceAdd to CartBuy Now