Wood One Dimensional Diffractal
A The Wood One Dimensional Diffractal shall be the model Diffractal® 72MH 2' x 2' as manufactured by RPG® Diffusor Systems, Inc., Upper Marlboro, MD 20774. Tel: 301-249-0044, Fax: 301-249-3912.
B The Wood One Dimensional Diffractal shall be fabricated with a 1/2" Class A Birch (or select other suitable veneered finish) veneer Duraflake and solid hard wood Birch (or select other suitable hard wood) inserts.
C The Wood One Dimensional Diffractal shall work on the one dimensional diffusing fractal reflection phase grating principle, using an array of wells of equal widths separated by thin dividers containing self similar inserts which conform to the number theoretic reflection phase grating principle. The depths of the wells for each nested Wood One Dimensional Diffractal shall be based on the prime 7 quadratic residue theory sequence, modulated by the quadratic depth sequences of the other self-similar Wood One Dimensional Diffractal.
D Sound diffusion in the horizontal plane shall be provided by wells in the vertical position while diffusion in the vertical plane shall be provided by wells in the horizontal position. The self similar diffusing elements shall be orthogonal, which allows the polar response of each band limited Wood One Dimensional Diffractal to be equal to what is operating independently, providing ideal diffusion in each frequency range. The Wood One Dimensional Diffractal may be rotated to achieve a variety of patterns that will provide a highly effective scattering surface.
E 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 Type A mounting shall be as follows:
| 125Hz | 250Hz | 500Hz | 1000Hz | 2000Hz | 4000Hz | NRC |
| 0.23 | 0.24 | 0.35 | 0.23 | 0.20 | 0.20 | 0.25 |
F Diffusion Coefficients for the product shall be measured in accordance with AES-4id-2001. The normal incidence diffusion coefficients are listed below at octave-band centers. The mean and standard deviation (
)
of the 1/3-octave-band coefficients are also tabulated. | 125Hz | 250Hz | 500Hz | 1000Hz | 2000Hz | 4000Hz | MEAN | SD |
| 0.75 | 0.71 | 0.77 | 0.80 | 0.71 | 0.51 | 0.71 | 0.10 |
G 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 One Dimensional Diffractal shall have a composite Flame Spread Rating of less than 25 and a Smoke Development of less than 450.
H The Wood One Dimensional Diffractal shall be supplied with a laquered finish (or select other suitable finish).
I The overall dimensions shall be 23-5/8"(H) x 23-5/8"(W) x 9-1/8"(D) and weigh no more than 29 pounds.
2'
x 2' CSI Specifications
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2000, RPG Diffusor Systems, Inc. |