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Point of Reference
10 dBA is the sound level of normal human breathing. To put it into perspective, thunder is a whopping 120 dBA...more
Good Hearing?
A typical person with good hearing can hear from about 20Hz to 20kHz (the audio bandwidth). A person's voice will usually range from 500Hz to 2kHz...more
Part E
Resistance of the Passage of Sound
Why are the new standards in Part E necessary? They are designed to improve modern living.
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In Area K
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