Wood Two Dimensional Diffusor
The Wood Two Dimensional Diffusor shall be fabricated from 1/4" Class A Birch (or select other suitable finish) veneer plywood.
The Wood Two Dimensional Diffusor shall work on the two dimensional reflection phase grating principle, using an array of square wells of equal widths separated by thin dividers. The depths of the wells shall be based on the phase-shifted prime 7 quadratic residue number theory sequence.
The Wood Two Dimensional Diffusor shall all be installed in the same orientation to preserve the two dimensional symmetry of the surface.
Absorption Coefficients and Noise Reduction Coefficient for the product shall be measured by an independent, accredited NVLAP facility according to the test methods as defined by ASTM C 423 and ASTM E 795. Random incidence Absorption Coefficients for the product in an E-400 mounting shall be as follows:
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F Diffusion Coefficients for the product shall be measured in accordance with the recommendations of the Audio Engineering Society Working Group SC-04-02 boundary measurement technique. The directional diffusion coefficient is given by the standard deviation of the 1/3-octave polar response, for a given angle of incidence, and normalized by the response of a flat panel of similar size. The average incidence diffusion coefficients determined at 5° intervals between ± 85° are listed below at octave-band centers. The mean and standard deviation (SD) of the 1/3-octave-band coefficients are also tabulated.
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Flame Spread and Smoke Developed shall be tested by an independent, accredited NVLAP facility according to the test methods as defined by ASTM E 84 and NFPA 255. The Wood Two Dimensional Diffusor shall have a composite Flame Spread Rating of less than 25 and a Smoke Development of less than 450.
The Wood Two Dimensional Diffusor shall be supplied with a lacquered finish.
The overall dimensions shall be 23-5/8"(H) x 23-5/8"(W) x 4"(D) and weigh no more than 22 pounds.