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 peaking at 600 – 3000Hz (3kHz) and a chainsaw at 4kHz
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