Tuning frequency of ported enclosures

[Godsmack 360]

In ported enclosure, if you were to use PVC or Aero ports of different sizes tuned to different fequencies what would be the end result?

Would the tuning frequency of the box be based off of the total port area or how would that exacly work?

J

[Jybfan04 1]

In my logical mind I think that it would take the 2 and give you an absolute value for your tuning because the 2 ports both share the same chamber..

Edited December 3, 2007 by Jybfan04

[ANeonRider 3]

No matter what, tuning frequency will always be determined by this equation:

Av = cross sectional port area in sq. in.

Lv = length of port

Vb = enclosure volume

If using multiple ports, calculate the total port area & port length.

That being said, I would not use different length ports, due to differing port velocities.

[Godsmack 360]

Good answer

but with the varying velocity, would it only make the sound turn to chit or is there more?