SPL box:

From what I got, if your box is:

28.5 x 13.5 x 32.5 / 1728 = 7.24cu'

I went with a port that is 24.5 w and 3 t:

(4 t and 28.5 w got messed up #'s. You always want to keep a 9:1 ratio to limit distortion.)

So:

A port that is 28.75 L x 3 T x 24.5 W will tune to 39Hz with a peak of 7.8dB @ 46.5Hz.

So:

(16.5 + 12.25) x 3.75 x (24.5 + 1.5) / 1728 = 1.62cu'

(Add 12.25 to the length for port correction factor. Add .75 to the h to compensate for the external height. and 1.5 for the external width.)

I don't know the sub displacement but I left .12 for it (Prob not enough but maybe close?):

5.5 + 1.62 = 7.12.....7.24 - 7.12 = .12

So: 5.5 air space, 1.62 port disp., .12 for sub disp.

Hope this helps, and, as always...have these #'s double checked.

*2006 Jeep Liberty*

Adire Audio, Cadence, Clarion, MB Quart

Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R

*Vb = vol. in cu**"**

**R = sq.rt. A / Pi (for square/slot port)

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