Ok. planing for a new box design for a 12" sub. I'm using both WinISD and BassBoxPro. I am going to end up with a winding port, but for some reason, I am getting a couple different sets of numbers too far apart to find a safe median for. Which one is more accurate? Here is the sub and desired effects for the box:
Ported box at 22hz (for flat response)
ISD box volume computes for 3 cu ft (85 liters), and I'm unsure if that's internal or external; BassBoxPro computes for 2.3 cu ft internal.
ISD gives a port length of 59.7", BassBoxPro gives a port length of 90.73"
Any advice would help.