How to Soundproof a Cardboard Box

Written by jason jensen
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How to Soundproof a Cardboard Box
(cardboard box image by MAXFX from

A common science project assigned to middle school and high school students is to make a soundproof cardboard box. A soundproof cardboard box also can come in handy when recording music---a guitar amplifier can be placed inside the box with a microphone to isolate the sound. The following technique can be used to soundproof any type of box or enclosed area.

Skill level:
Moderately Easy

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Things you need

  • Cardboard box
  • Styrofoam sheets
  • Sound deadening (such as Dynamat)
  • Scissors
  • Glue
  • Tape measure

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  1. 1

    Measure and cut the styrofoam sheets into squares or rectangles that will fit inside the cardboard box. You will need to cut a total of ten sheets, two for each wall of the box (the four sides and the bottom).

  2. 2

    Cut five pieces of sound deadening that match the styrofoam rectangles, one for each wall of the box. Sound deadening is a material made to soften sound; it is often used in cars.

  3. 3

    Glue one sheet of styrofoam to each of the four sides and the bottom of the inside of the cardboard box.

  4. 4

    Glue the five pieces of sound deadening over the first layer of styrofoam.

  5. 5

    Glue a second layer of styrofoam over the sound deadening.

Tips and warnings

  • Add more layers of styrofoam and sound deadening to further muffle the sound.

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