Certificate – weighted sound absorption coefficient αw = 0.75 – EchoFree acoustic booth – VocalBoothToGo

Certificate – weighted sound absorption coefficient αw = 0.75 – EchoFree acoustic booth

Laboratory measurement of the sound absorption of the wall material of the EchoFree acoustic booth (VocalBoothToGo acoustic blankets, single layer) in the reverberation room of the independent Riverbank Acoustical Laboratories (USA, NVLAP accreditation, ISO/IEC 17025). The measured values give a weighted sound absorption coefficient of αw = 0.75 according to the European standard EN ISO 11654.

How much sound the booth walls absorb

The chart shows what percentage of incident sound the booth wall material absorbs at each frequency, from deep bass on the left to highs on the right. In the bass it is less (13 % at 125 Hz, 44 % at 250 Hz); from 500 Hz upwards it is over 85 %, i.e. across the whole range of the human voice. From these values a single number is calculated according to EN ISO 11654, αw = 0.75, which lets you easily compare the booth with other acoustic materials. The detailed PDF version contains the step-by-step αw calculation and the original laboratory report.

Sound absorption assessment of the EchoFree booth, αw = 0.75

Downloads: αw assessment (PDF, 1 page) · Detailed assessment with calculation and the original Riverbank report (PDF)

Product: EchoFree acoustic booth

Tomas Skok
Author: Tomas Skok

For over 20 years he has worked with sound and acoustics. He has designed the acoustics and soundproofing for several music studios, measures rooms with REW and has produced his own tracks in Cubase and Ableton. He started out as a vinyl DJ and as a sound engineer at large events, and later taught courses on recording sound for video. He runs his own shop for audio, studio, DJ and lighting equipment, and on vocalboothtogo.eu he writes about room acoustics, noise control, recording and microphones – and about how to cut street noise at home, sleep better or keep the heat in.

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