Leaderboard

The subsonic (high pass) is generally 4th order not 2nd order filter in most amps so it will need to be set higher to better control excursion, also, WinISD doesn't account for cabin gain so your frequency response just show how the box will play outdoors. But you can still compare your plot with a 4.75 net box tuned to 29Hz (the prefab) to see how much are you expected to gain, that actually is useful information you might be interested in.