# Learn How to Calculate Subwoofer Port Tuning Frequency - Tutorial

## Calculate Subwoofer Port Tuning Frequency (F)

#### Definition

Tuning of a subwoofer vent tuning box is established mainly by the grouping of port area, port length, and net volume of the subwoofer box.

#### Formula

F = (23562.5 x D2 x N) / (V x (L + KD))
###### Where,
D = vent diameter N = number of vents V = volume of box L = vent length K = end correction factor
##### Example

A subwoofer contains 2 vents of length 5 cm and diameter of 8 cm. The volume of box is 200 cm3 and it produces end correction factor of 4. Calculate the tuning frequency (F) for the subwoofer box?

##### Given,

Vent diameter (D) = 8 cm Vent length (L) = 5cm End correction factor (K) = 4 Volume of box (V) = 200 Number of vents (N) = 2

##### To Find,

Tuning Frequency (F)

##### Solution

Tuning Frequency (F)= (23562.5 x D2 x N) / (V x (L + KD)) = (23562.5 x 82 x 2) / (200 x 0.001 x (5 + (4 x 8))) = (23562.5 x 64 x 2) / (200 x 0.001 x (5 + 32)) = 3016000 / 7.4 = 407567.568 = 638.41 Hz