Enter the number or ports, vent diameter, box volume, and tuning frequency into the calculator to determine the port length.

## Port Length Formula

The following is the port length formula:

L = [ ( 2.356*10^4* D^2*N)/(V*F^2) ] * (k*D)

- Where L is the port length
- D is the vent diameter
- N is the total number of ports
- V is the volume of the box
- F is the tubing frequency
- k is the correction factor (.732)

## Port Length Definition

A port length is defined as the proper length of the vent of a subwoofer.

## How to calculate a port length?

- First, determine the vent diameter.
- Next, determine the total number of ports.
- Next, determine the volume of the box housing.
- Next, determine the tubing frequency.
- Finally, calculate the port length using the formula above.