Build a Triffusor

Materials (per triffusor):

  • 2x equilaterally triangular pieces of MDF wood
  • 2x rectangular pieces of MDF wood (width same as trianglar side)
  • 1x rectangular piece of MDF wood slightly shorter and thinner than other pieces
  • Acoustic foam rectangle the size of the 2 larger pieces of MDF wood
  • 5 long thin pieces of any kind of wood to be placed on one side for diffusion
  • A decent number of screws and some PVA glue (and some contact glue, though PVA will work)
  • Saw(s) and miter box (if cutting any of the wood yourself)
  • (Optional) beading for the edges

Process:

Attached larger pieces of MDF wood to two sides of one of the triangle. PVA glued, and then screwed them together.  Attached other triangle to other end of the rectangular MDF wood in the same way.

Used contact glue to attach acoustic foam to one side of the triangular prism.

Put smaller wood rectangle where third side of triangle would go and push it in so that it sits further back than the other sides.

Place long thin strips of wood against the side with the deeper wall and glue

Acoustic Properties:

–       Reflective side: The reflective side is smooth wood, allowing the sound to bounce off easily, creating direct reflections.

–       Absorptive side: The side with the acoustic foam is designed to absorb sound. When the sound hits the acoustic foam it enters any tiny gaps in the foam and bounces around inside it so many times that barely any of the sound manages to get reflected, most of it dies within the foam.

–       Diffusive side: The side with the further back wood and strips of thin wood running up and down it is designed to diffuse any sound that hits it. Either before or after the sound hits the back panel, much of it will reflect off the strips causing it to be reflecting off to the sides, known as being ‘diffused’, often used to stop early reflections from causing phase cancelation without killing the reflections all together and risking deadening the room too much.

Personal Uses:

  1. In parts of my room there are cupboards and dressers that would cause unusual reflections, reflective side could be placed in front of these to give more direct reflections.
  2. Diffusive or absorptive side could be placed at the back of my room where the first direct reflections would occur to send them in different directions of absorb them to reduce possible comb filtering in the listening position.
  3. Absorptive side could be placed facing out of the corners and be used as a bass trap.

Evaluation: Overall, each of the triffusor’s sides has the acoustic properties they were designed to have, and the triffusor itself is very sturdy and solid. If building more, the only thing I would do differently is take more time perfecting some of the measurements in attempt to get that really neat and tidy, professional look.

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