Skopos Acoustic Fabrics - to minimise sound reflection within a room.
Curtains and other fabrics play an important role in providing contract spaces. Sound absorption is measured in an area called a Reverberation Room, using the sound absorption coefficient alpha (α), which has a value between 0 and 1.00. A measure of Zero represents no absorption (total reflection), and 1.00 represents total absorption of the random incidence sound. To enable simple comparison between fabrics, samples are classed on a scale from A to E, with A-rated products having the highest rated sound absorption performance (alpha-w > 0.9) and E being the lowest (alpha-w = 0.15-0.25). Fabrics and soft furnishings can all be measured in this way, as can the other elements within the room. First, a fabric is tested to obtain absorption coefficient values over a range of standard test frequencies, according to BS EN ISO 354. These are then plotted on a graph to produce an absorption curve. The sound absorption class is attained by comparing these values against a reference curve, resulting in an sound absorption coefficient (αw) calculated in accordance with BS EN ISO 11654. This is then split into classification groups A-E. To minimise sound reflection within a room, the curtains play an important role and tests show that blackout lined curtains, using fabrics with a higher alpha-w rating, provide the best results if Acoustics are top of the list.
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