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The Decibel Scale
Gives an approx of human perception of loudness. This is because the human ear has a logarithmic response to changes in sound level...more

Reverberation Time
The reverberation time of a room is defined as the time it takes for sound to decay by 60 dB after an abrupt termination...more
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For further BS4142 information for your area, be sure to check out Sound-Testing-.co.uk.
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BS4142 can also be known as:
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In County S
Enviromental Noise Assessments in Shropshire, Enviromental Noise Assessments in Somerset, Enviromental Noise Assessments in South Yorkshire, Enviromental Noise Assessments in Staffordshire, Enviromental Noise Assessments in Stirlingshire, Enviromental Noise Assessments in Strathclyde, Enviromental Noise Assessments in Suffolk, Enviromental Noise Assessments in Surrey, Enviromental Noise Assessments in Swansea County,