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How to properly build and design speaker and woofer box enclosures



Remember: measure once, cut once


It sounds basic but it’s easier to double check a measurement than to cut a new piece of wood


It is very important when building a subwoofer or speaker enclosures that proper materials and techniques are used in the process.

Due to its favorable characteristics.75”mdf (Medium Density Fiberboard) should be used whenever possible. Particle board, chip board and/or plywood are not suitable materials for enclosure construction. 

Once your board is cut into the correct size/shape pieces, air-nail or screw the box together. Be sure to always use a quality wood glue in the seams, as it will prevent enclosure damage or air leakage

After the box is assembled ,seal the inside seams using  %100 silicone sealant (even in ported and band pass enclosures). For ports, make sure to round off the inside edge of the top of the port and both edges at the bottom.

To reduce port noise, this applies to both round and slot ports. In larger enclosures, internal bracing should be used to help cut down on flexing and resonance. In the minimum recommended box size adding dampening material such as Dacron or fiberfill (1 pound per 3ft) will help” trick” the woofer into thinking it is a slightly (approx.10%) larger enclosure.

For extremely odd shapes, fiberglass mat may be used to contour your enclosure to a custom shape. When constructing a fiberglass enclosure you should use as much MDF as possible and fill the spaces with fiberglass.(fig-1) Fiberglass mat has a higher resonance than MDF and can cause the enclosure to sound ”tinty”, spraying sound dampening material on the inside surface of the fiberglass walls, as it will help lower is resonance.




  • Use .75”MDF

  • Screw or air-nail together

  • Use generous amount of wood glue

  • Seal all internal seams with silicone sealant

  • Internally brace all moderate size encloses

  • Radius port edges-ID for the top, ID&OD for the bottom

  • Sound dampen all fiberglass walls







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