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The uniformity of diffusion is characterised by the standard deviation of the 1/3 octave polar response, for a given angle of incidence. For each of the 37 angles of incidence, 37 backscattering impulse response measurements are made at 5° increments between 0° and 180°. The diffusion coefficient is the mean standard deviation for all angles of incidence, normalised to the standard deviation of a delta function (1 equals ideal diffusion). The data illustrates the exceptional uniformity of diffusion above the diffraction limit (565 Hz = 1130 ft/sec/2'), which is related to the 2' dimension of the panel.
The expanded polypropylene / EPS mix material of the Cityscape provides useful low/mid frequency absorption between 250Hz and 1kHz