At amplified music concerts, from medium sized venues to the biggest arenas, low frequency reverberation is known to be the primary source for an undefined sound with low clarity, even close to the loud speakers. Therefore, means for providing additional low frequency absorption is always a concern. Several layers of fabric at various distances from reflecting surfaces has usually been the best option. Still this method provides a relatively modest absorption coefficient in the important 63 and 125 Hz octave bands, while damping the high frequencies which the audience absorbs well, also due to the high Q of loud speakers at higher frequencies. A new, patented technology of inflated, ultra thin plastic membranes seems to solve this challenged in both multipurpose venues that need to adjust their acoustics at the push of a button, or in halls and arenas that only occasionally present amplified music and need to be treated for the event. This paper presents briefly the technology with cases from differently sized halls and arenas.
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