Subwoofers don't have to be contained in a rectangle or square-shaped container. A Sonotube is a cylindrical cardboard container used for moulding columns from concrete. It's heavy and solid and great for holding a subwoofer. It also negates the need to have any skills in woodworking to build a subwoofer. Because very low frequencies don't register directionally on the human ear, a subwoofer can go anywhere and can have a dual use as a piece of furniture.
- Skill level:
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Things you need
- 24-inch diameter Sonotube
- Rasp or rough file
- Binding posts
- Birch plywood
- PVC 90-degree elbows
- 4-inch I.D. PVC pipe
- PVC cement
- Flathead wood screws
- Wood glue
- Silicone caulk
- Liquid Nails cement
- Acoustic Foam
- 12-gauge speaker wire
- Rubberised undercoating automotive spray
- 4-inch I.D. port "flares" (optional)
Find out how much space your bass speaker needs to operate properly. The speaker instruction book should include the airspace requirements. Work out the cubic foot volume of your enclosure by multiplying its width, depth and height and then divide by 1,728. An online design tool which will do this is listed in Resources.
Remove, with a jigsaw, the bottom, rear top, front and sides of the MDF tube that is your enclosure. Label the panels with which side they came from.
Saw a round hole in the front panel for the speaker. Make it big enough so that the speaker can rest level with the front of the panel. Mark the location of the speaker's mounting holes on the front panel and drill guide holes before screwing the speaker firmly into place.
Begin to build the box by gluing all but the side panels, that were removed earlier, back together. This is just an initial fix, and should be backed up by drilling guide holes and then screwing the panels in place. Use a 2-inch hole saw to create a ventilation hole in the rear panel.
Attach the terminal block to the exterior of the rear panel with screws. Take the wires from the speaker terminals to the terminal block through the ventilation hole and make the connections. Now you can easily plumb the speaker and your stereo system together.
Complete the reassembly of the enclosing box by gluing, then screwing, the sides back in place, making sure the box is completely sealed all round. Give the adhesive at least overnight to dry before you operate the subwoofer.
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