How to Build a Dual 12 Sub Box

The design of a dual 12-inch subwoofer box is critical to the sound the speaker produces. Full enclosures separate the sound coming from the rear of the speaker from that which comes from the front of the speaker, giving more distinction to the sound. Most speaker manufacturers include the recommended dimensions of the sub box to make it produce the desired results. Covering the box with carpet or painting it black are among the most common choices for finishing the outside of the box.

2 pieces of 15 1/4-by-7-by-5/8-inch medium-density fiberboard (MDF)
Combination square
Variable speed square
1/16-inch drill bit
3/8-inch countersink bit
1 piece of 28 3/4-by-15 1/4-by-5/8-inch MDF
2 pieces of 28 3/4-by-10 3/8-by-5/8-inch MDF
Framing square
Jigsaw
Phillips screw tip
1 1/4-inch drywall screws
1 piece of 14-by-10-by-5/8-inch MDF
2 pieces of 16-by-15 1/4-by-5/8-inch MDF
Compass
3/8-inch drill bit

Instructions

- 1
  Place the 15 1/4-by-7-by-5/8-inch MDF on a worktable. These pieces are the left and right sides of the box. Set the blade of the combination square on 3/8-inch. Put the long leg of the head against the edge of the MDF and draw a line on three of the edges.
- 2
  Drill three pilot holes on the lines on the long edges with a 1/16-inch drill bit. Drill one about 1 inch from the ends and one in the center. Drill two holes on the line on the short edge, about 1 inch from the ends of the line. Drill countersink holes on top of the pilot holes about 3/8-inch deep.
- 3
  Draw a line down both of the long edges of the 28 3/4-by-15 1/4-by-5/8-inch MDF. This piece is the bottom of the box. Drill pilot holes on the lines about 1 inch from the ends and four more spaced evenly apart. Drill countersink holes.
- 4
  Place the two pieces of 28 3/4-by-10 3/8-by-5/8-inch MDF on the worktable. Make a mark at 14 3/8 inches on one long edge. Place the framing square on the mark and draw a line across the MDF. Drill three pilot holes followed by countersink holes.
- 5
  Measure from one corner and make a mark at 6 3/8 inches on the 10 3/8-inch ends. Label the long edge beyond the marks as the top. Set the long leg of the framing square on the marks and draw a line connecting them. Cut the lines with the jigsaw. These boards are the front and back pieces.
- 6
  Stand one of the sides on a 7-inch edge. Secure the 15 1/4-inch edge of the bottom to the side through the pilot holes with the drywall screws. Repeat this process with other side. Stand the assembly on one of the sides. Insert the front and back between the sides. Secure the boards to the bottom and the sides with the drywall screws. Secure the 14-by-10-by-5/8-inch piece between the front and back through the pilot holes in the center.
- 7
  Mark the 15 1/4-inch edges of the two pieces of 16-by-15 1/4-by-5/8-inch MDF at 7 5/8 inches. Place the framing square on the mark and draw a line across the MDF. Place marks on the 16-inch edges at 8 inches. Draw a line across the MDF to create the center point of the piece.
- 8
  Set the compass on 5 5/8 inches. Stick the point in the center point and draw a circle on the MDF. Drill a hole with the 3/8-inch drill bit inside the circle. Insert the blade of the jigsaw into the hole. Cut the circles out of each piece. Drill pilot holes and countersink holes on the 16-inch edges of these pieces. Secure them on either side of the apex with the drywall screws.

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