Spray paint an EPS diffusor

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Color applied : Metallic Gray

Here I tell you about how to spray paint an EPS wall panel. (EPS = extruded polystyrene, Diffusor = breaking, scattering a soundwave)

Starting point

The starting point is a white – uncolored – wall panel, non-colored from production. As EPS doesn’t stand against any form of alcohols, a primer has to be applied. Otherwise, the spray propellant will eat away on the surface. The primer is water based, and propellant other than alcohol based.

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Restorative acoustic conditioning

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(Suomeksi tässä)

Acoustical conditioning as a restorative factor

(A speech given to the local Toastmasters club members)

I open with a strong one-time clap of hands.

2017-11-02 12.11.33

Did anyone hear an echo? No? Well, it was a very quick-responding one. Not a long-ringing echo, such as one can hear in a large room. Continue reading Restorative acoustic conditioning

Large PRD-architecture

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Math or no math, that’s the question

Architecture that – unintentionally – form large diffusers

PRD’s are diffusers based on math, on Prime Roots to be exact. The calculated surface irregularity ensures that soundwaves are treated much the same way as stealth planes deal with radar waves.

Walking through Helsinki city with a mind (heart) focused on acoustics, on how to dampen noise, inevitably a structure will catch the eye. A structure that reminds of a sound-treating construction. Continue reading Large PRD-architecture