So I'm trying to calculate the port length of a 3.5cuft box tuned to 32hz for my 15"SX. I searched and found a couple calculators. WinISD says the port length needs to be 66.28", but I heard it's not accurate. The Carstereo.com calculator sayed somewhere around 74", and from the same sight I used the formulas given to get 78.7". (req: don't you have a tutorial or something? I couldn't find it)
Do these numbers even sound right? It seems to me that it would be hard to fit that much port in my trunk, but this will be my first ported box so I don't really have a clue.