# Lets talk ports?

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K.. I'm having a lot of trouble designing a ported box. Everytime I think I've got it, I'm wrong. Is there a simple equation that determines frequency? Such as.. Volume of box / volume of port?

I've seen those little web page calculators that determine round port volume, but I suck at math. I can't figure out the same-volume demensions of a slot port. There an equation for this as well?

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Alpine 7897

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JBL bp1200.1

Brahma 15

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volume of a cylinder is lengh x area

V= L x A

Volume of a box is the Height x width x depth

V= H x L x W

Find the volume of your round port and then use the size slot port you want to make and that will tell you your lengh.

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Tuning freq. is determined by the cross area of the poprt, not the actual volume. Here is a formula that shoe you the way...how simple it is depends on your level of math.

2006 Jeep Liberty

Adire Audio 15" Brahma running off Cadence A7hc, Clarion hu, MB Quart 6.5s and 5.25s running off old school Punch 800a4

146+db @ 38hz with 1200w and a single 15"

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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