Sound is emitted from thousands of everyday items and people all around us. Consistently loud or intermittent sounds can destroy your quality of life. Frequency is also a factor with low frequency sounds being difficult to attenuate and high frequencies very effectively blocked. This is measured in Hertz – common noises are such as a stereo bass (40-80Hz), the human voice (300Hz), rock music (600-3000Hz) and a chainsaw (4kHz).
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