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<blockquote data-quote="thehardknoxlife" data-source="post: 7643689" data-attributes="member: 563104">Not really, there are quite a few formulas. None will be 100% accurate but a lot more accurate than your online calculators. This is the one I use. It&#039;s also the formula used in the program Bass Box Pro Lv= {(14630000 x R²) / (Fb²) x [(Vb/Np) x 1728]} - 1.463 x RLv= Port Length (inches)Fb= Tune Frequency (Hertz)R= See ******* (this will use different equations depending on round or square vents)Vb= total internal airspace (cubic ft)Np= Number of ports******This is for square vents and will take place of R.R= √[( H x W) / π]√= square rootH= height of port (inches)W= width of port (inches)π = 3.141592 (pi)******This is for round vents and will take place of RR= (Dia / 2)Dia= Vent Diameter</blockquote>

[QUOTE="thehardknoxlife, post: 7643689, member: 563104"] Not really, there are quite a few formulas. None will be 100% accurate but a lot more accurate than your online calculators. This is the one I use. It's also the formula used in the program Bass Box Pro Lv= {(14630000 x R²) / (Fb²) x [(Vb/Np) x 1728]} - 1.463 x R Lv= Port Length (inches) Fb= Tune Frequency (Hertz) R= See ******* (this will use different equations depending on round or square vents) Vb= total internal airspace (cubic ft) Np= Number of ports ******This is for square vents and will take place of R. R= √[( H x W) / π] √= square root H= height of port (inches) W= width of port (inches) π = 3.141592 (pi) ******This is for round vents and will take place of R R= (Dia / 2) Dia= Vent Diameter [/QUOTE]

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