1-3 working days delivery for in stock items (unless stated otherwise on the product page); may be longer for rural postcodes.
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THE NASTY BUG: PLEASE NOTE... We are currently working remotely but can take most phone calls and our distribution service is still operational for most stock items.
We are also contactable via email.
We can only process online orders at this time, anything that cannot be done online we can process manually in about 48hrs via email.
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