How to build a speaker enclosure for a 38 cm (15 inch) woofer

Written by nichole liandi
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How to build a speaker enclosure for a 38 cm (15 inch) woofer
With some extra effort you can give your speaker box a retro look. (Hemera Technologies/PhotoObjects.net/Getty Images)

Fifteen-inch woofers are speakers designed to reproduce low frequencies. When used in cars, these subwoofers, as they're more commonly called, are often sold as "raw speakers" -- a speaker with no enclosure. To operate properly, the speaker must be mounted in an enclosure, or box, that's designed to give the subwoofer a proper environment in which to operate. The design of the box doesn't have to be elaborate, but it must be of the correct size to hold the 38 cm (15 inch) woofer and sturdy enough to stand up to day-to-day operation.

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Things you need

  • 1 sheet 1.2 by 2.4 m (4 feet by 8 feet) of 1.2 cm (1/2 inch) MDF
  • Tape measure
  • Circular saw
  • Wood screws (#10, 1.8 cm (3/4 inch)
  • Phillips screwdriver
  • 38 cm (15 inch) subwoofer
  • Jigsaw
  • Drill with 9 mm (3/8 inch) bit
  • Speaker wire

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Instructions

  1. 1

    Cut four 45 cm by 45 cm (18 inch by 18 inch) panels from the sheet of MDF, using a circular saw. Cut two more panels measuring 42.5 cm by 45 cm (17 inches by 18 inches) from the sheet of MDF, using a circular saw.

  2. 2

    Place two of the 45 cm by 45 cm (18 inch by 18 inch) panels and the two 42.5 cm by 45 cm (17 inch by 18 inch) panels together to form a hollow box with external dimensions of 45 cm by 45 cm (18 inch by 18 inch). Screw the panels together with a screwdriver and wood screws.

  3. 3

    Place the front and back panels -- the two remaining 45 cm by 45 cm (18 inch by 18 inch) panels -- on the box and screw them on the box with a screwdriver and wood screws.

  4. 4

    Cut an opening in the front of the box for your 38 cm (15 inch) woofer, using a jigsaw.

  5. 5

    Drill a hole in the back panel and slide the end of your speaker wire into the hole from the outside. Reach into the box and pull the wire out through the front. Attach the ends of the wire to the woofer.

  6. 6

    Place the woofer in the front panel opening. Screw it into the box with a screwdriver and wood screws.

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