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Ported woofer box

How to build and design a ported woofer box

 

 

 

 

Ported or "Tuned Ported" box

Ported enclosures use a tuned port or vent to increase output at lower frequencies. Air inside the port acts like a piston or motor that moves in phase with the woofer, reinforcing the frequencies response.

 

Ported enclosures are distinguished by a vent or duct in the structure. This vent allows the rear sound wave of the woofer to interact with the front sound wave. The coupling of a vent to the air inside the enclosure reinforces the low-frequency response of the subwoofer system and can greatly increase the efficiency. By changing either the length or surface area of the port, the resistance to motion of the column of air within the port changes its resonant characteristics, thus causing the tuning frequency of the enclosure to change.

 

Sealed

Pros :

  • Small box designed 

  • Higher power handling

  • Excellent dampening in transient responses

  • Easily to design and build

  • Can be forgiving of design and construction errors

Cons:

  • Limited efficiency

  • Output

 

Box Design

 

Introduction

 

Speaker enclosure types

 

Speaker boxes design

 

Sealed box

 

Ported woofer box

 

Infinite baffle

 

Sealed Inverted

 

Wiring

 

Speaker polarity and impedance

 

Speaker wiring:Parallel, Series, Series-Parallel

 

 

Calculators

 

Woofer box calculators index

 

Calculating speaker enclosure volume

 

Rectangle sealed enclosure volume calculator

 

Circle port to slotted port calculator

 

Triangle Box volume calculator

 

Parallel- Parallel Load Calculator

 

Port length calculator

 

Series - Parallel load calculator

 

Tips

 

Bass cancellation

 

 

 

Google

 

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