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Sealed Inverted woofer box

How to build and design a sealed Inverted woofer box





Sealed Inverted box

Sealed Inverted woofer box enclosures are a lot like a sealed box, however, the speaker magnet is placed on the outside,  of the box and not the inside of the box. Sound quality on this type of box is no different from a sealed woofer box ,as this design is primarily for aesthetics. 

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

These type of boxes are not as popular as standard sealed enclosures, due to the amount of space they take up.


The  "sealed box," design  is similar to the infinite-baffle design. A sealed box is an airtight enclosure. Since the speaker is mounted in on the front 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 and have excellent damping, excellent power handling, low-frequency response, and ease 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 should use at least 3/4in. particle board. Once the box is complete and the speaker holes are cut, you will need to seal the box  completely airtight with a good quality sealant. We prefer %100 silicon sealant. 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 sealant on the underside of the woofer. Be sure to place all 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


Woofer box Laboratories



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







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