Expanded Polystyrene Optimized Two Dimensional Primitive Root Diffusor
A The Expanded Polystyrene Optimized Two Dimensional Primitive Root Diffusor shall be the model Skyline® as manufactured by RPG® Diffusor Systems, Inc., Upper Marlboro, MD 20774. Tel: 301-249-0044, Fax: 301-249-3912.
B The Expanded Polystyrene Optimized Two Dimensional Primitive Root Diffusor shall be molded from high density Caril-F flame-retardant grade expanded polystyrene.
C The Expanded Polystyrene Optimized Two Dimensional Primitive Root Diffusor shall work on the two dimensional optimized primitive-root reflection phase grating principle, using an array of rectangular phase blocks. The heights of the phase blocks shall be based on the optimized primitive-root number theory sequence based on prime 157. The diffusing panels shall all be installed in the same orientation to preserve the two dimensional orientation of the surface.
D 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:
| 125Hz | 250Hz | 500Hz | 1000Hz | 2000Hz | 4000Hz | NRC |
| 0.00 | 0.34 | 0.28 | 0.29 | 0.19 | 0.16 | 0.30 |
E 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.
| 125Hz | 250Hz | 500Hz | 1000Hz | 2000Hz | 4000Hz | MEAN | SD |
| 0.71 | 0.70 | 0.71 | 0.67 | 0.76 | 0.74 | 0.70 | 0.04 |
F Caril flame retardant grades meet the requirements of FMVSS-302 standards.
G The Expanded Polystyrene Optimized Two Dimensional Primitive Root Diffusor shall be supplied in a flat white painted finish.
H The overall dimensions shall be 23-3/8"(H) x 23-3/8"(W) x 7"(D) and weigh no more than 4 pounds.
CSI Specifications
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2000, RPG Diffusor Systems, Inc. |