The sound intensity of sound is measured in decibel units. (dB); A-weighted DB unit, that is used to demonstrate that humans can hear. Zero DB is considered the point at which people start to be heard to whisper soft 3 feet is equal to approximately 30 dBA while a frantic can reach 110 DB or more operational phase. In the works about the musician will be heard at a level beyond the standard value, but will be heard in a period not to exceed eight hours, hearing about the disease increases.
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