How to Build a Twin 12 Inch Sub Box

Written by jared curtis
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How to Build a Twin 12 Inch Sub Box
Build your own subwoofer box. (speaker image by Byron Moore from

You can build a twin 12-inch subwoofer box yourself with the proper tools. A subwoofer is a large speaker that is designed to produce bass. Subwoofers need to be hooked up to a power amp to provide the power they need. Subwoofers come in different diameters to fit any application. These instructions are for a dual 12-inch subwoofer box but can be adapted for different sizes.

Skill level:

Things you need

  • Tape measure
  • Pencil
  • Circular saw
  • Wood glue
  • Power drill with tip
  • 1 1/2-inch grabber screws
  • Masking tape
  • Jigsaw

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    Cutting Parts

  1. 1

    Measure the space you have to fit a subwoofer box using a tape measure

  2. 2

    Develop a cut-list for the speaker box. The front, bottom, top and back should be 1 1/2-inches less in length than what you want your box to be. The sides will butt-joint into these parts.

  3. 3

    Draw all the pieces needed out on the 3/4-inch MDF. Cut the MDF so as to leave little waste using a circular saw. Label each piece with a pencil to avoid confusion during installation: You should have two sides, a top, a bottom, a back and a front. Confirm that all the parts are cut.

    Assembling Subwoofer Box

  1. 1

    Drill three 1/8-inch pilot holes in both sides of the subwoofer box. These holes should be placed on the top and bottom of the sides.

  2. 2

    Apply a thin line of wood glue to the edge of the bottom. Slide the side and the bottom into position. The edge of the bottom should butt-joint into the side. Fasten the two parts together using 1 1/2-inch screws and a power drill.

  3. 3

    Apply a thin line of wood glue to the top and fasten together using 1 1/2-inch screws and a power drill.

  4. 4

    Place a small line of glue on the edges of the back of the subwoofer box. Fasten the back to the subwoofer box using 1 1/2-inch screws.

  5. 5

    Apply glue to the remaining edges of the subwoofer box and place the front onto the box. Attach the front to the box using screws and a power drill. Allow the box to dry before moving.

    Speaker Cutout and Installation

  1. 1

    Remove the paper template provided with your 12-inch subwoofer. Place the template onto the front of the speaker box and attach the template using masking tape.

  2. 2

    Cut out the speaker hole using a jigsaw. Slowly cut the material to avoid chipping. Place the template where the second subwoofer will be located and fasten using tape. Cut out the second hole with a jigsaw.

  3. 3

    Install the subwoofers into the speaker box. Fasten the speakers using the screws provided with the speakers and a power drill.

Tips and warnings

  • You may carpet the subwoofer box if you prefer.

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