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DIY diffusers...?

Discussion in 'Home Cinema Building DIY' started by NicolasB, Nov 26, 2003.

  1. NicolasB

    NicolasB
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    There has been some talk in the past about somewhat-less-expensive-than-Auralex options for acoustic absorbers. For example, Rockwool slabs compare quite well to Auralex pyramids or wedges in terms of sound absorption, but cost substantially less.

    What would be a cheap, DIY equivalent to Auralex's diffusion-based products (or similar)?

    How about a solution based on egg boxes and lego bricks? :)
     
  2. pemberto

    pemberto
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  3. avanzato

    avanzato
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  4. Nic Rhodes

    Nic Rhodes
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    Why not try vacuum forming plastic over a wooden template?
     
  5. NicolasB

    NicolasB
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    Any thoughts on diffusers that work at bass-frequencies? Or is this not technically feasible?
     
  6. Gary Lightfoot

    Gary Lightfoot
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    Hi Nic,

    how did you get on with the rockwool project you were doing? What results did you get (or was it someone else?)

    Gary.
     
  7. alexs2

    alexs2
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    For bass,things like ASC's Tube Traps are most effective,acting as quarter-wave traps.....there are plenty of designs for homemade versions,and relatively easy to make,but not exactly unobtrusive.
     
  8. avanzato

    avanzato
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    Someone over at Zerogain had a Sound Consultant install eight, 1.3 metre tall, 10cm diameter, 'rubber bung tuned' cardboard tubes to tame the bass. Sounded to me like the Room lens concept.

    The cuved surface should give some HF diffusion so several stacked next to each other might be interesting to try. Cardboard tubes aren't expensive and there'd be little or no DIY involved.
     
  9. alexs2

    alexs2
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    It's a pity that good affordable DSP based solutions to room/speaker interactions are only just becoming available,as it will eventually do away with needing room treatments +/- bass traps etc.

    Certainly had something like that been available a few yrs ago when I moved house,I'd probably not have sold the Linn Keltiks I had at that time.
     
  10. NicolasB

    NicolasB
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    Hasn't even got off the ground. Probably never will. :(

    I rather doubt that. In the first place there are directional issues. You may well be able to make a direct sound resemble a reflected sound by playing about with delays and phase changes but it's difficult to see how you could completely simulate (or cancel out) the directional aspect of a reflected sound, as speakers are too close to being point sources - I don't see how you could, purely by electronic means, change the overall shape of the wave front across the room accurately enough.

    On top of that, even if a sufficiently ingenious DSP solution could completely compensate for room effects at one particular point within the room, I can't see that there's any way to make it work at all points in the room. Even something as simple as an axial standing wave produces nodes and anti-nodes - unless there is some way to prevent the standing wave from being set up in the first place, I don't see how a solution that produces an accurate frequency response at a node can produce a similarly accurate one at an antinode.
     
  11. micb3rd

    micb3rd
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