Information Labs


  Site map About Us Help Contact Us Resources  






Sealed box woofer box design

How to properly build and design sealed woofer box enclosure.




Sealed box or

Acoustic Suspension

Sealed woofer box enclosures use a calculated volume  of the air as a "spring" to help control woofer cone movement.

Sealed woofer box enclosures can have a relatively smooth bass response.

Sealed enclosures are the most popular of all enclosures, due to its efficiency and the ease of construction.


The  "sealed box," design  is similar to the infinite-baffle design. A sealed box is a completely airtight enclosure. Since the speaker is mounted in one face of the enclosure, there are no paths for sound to travel from the rear of the speaker to the front, blocking the rear sound wave

 "mixing" with the front. Sealed speaker boxes are quit easy to design and build, and they generally perform well with almost any speaker excellent damping,

good power handling,  low-frequency response, and simplicity of design and construction make the sealed-box enclosure an ideal choice for many installations.

There are some drawbacks to using a sealed box, however. Using a box that's too small can have adverse effects both on your system's output level and on its deep-bass performance. Efficiency is another matter of concern; typically, sealed-box systems are less efficient than vented systems (see vented systems) and require more power and  to achieve the same output levels.


Building the box

When building a sealed speaker enclosure, as a rule of thumb you will want to use at least 3/4in. particle wood. Once the box is complete speaker holes are cut, you will want to seal the box airtight with silicone select. When mounting the woofer be sure to place the rubber gasket that came with the speaker on the underside of the speaker. if a rubber gasket did not come with your speakers, place a small bead of silicone on the underside of the woofer. It is important that you place a screws in all holes located on the woofer as this will create an airtight seal.


Testing the seal

You can test your seal by pressing on the speaker cone. The speaker cone should return to its normal position slowly, Check for any air leaks by listening for any hissing sounds while moving the cone.



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


  • Limited efficiency

  • Output


Box Design




Speaker enclosure types


Speaker boxes design


Sealed box


Ported woofer box


Infinite baffle


Sealed Inverted




Speaker polarity and impedance


Speaker wiring:Parallel, Series, Series-Parallel





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




Bass cancellation






Help About Us Site map Contact Us Link to us Links

Copyright 2001 - 2012 Mobile Information