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.

POINTS TO REMEMBER:

• 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

Sealed box woofer box design

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.