Confused.

[Blu84Rex 10+ year member]

I am kinda confused on the calculation for the length of the port.

Lv = [(1.463*10^7R^2)/(Fb^2*Vb)] - 1.463

I know that Fb is the tuning in Hz but is it what I want it to be or is it the result of another calculation? Also for Vb is that the gross amount or after sub displacement?

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[Immacomputer 10+ year member]

Vb is net volume. So it's the volume of the enclosure after sub and port displacement.

I really suggest using win isd for calculating port length. Doing it by hand can be quite off if you're not using round ports.