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TYPICAL SOUND LEVELS <br /> 50 HP SIREN - - - - - - - - -- - - -- - -- --- - - - --- __ - - - <br /> PAIN THRESHOLD _ <br /> AIR PLANE -- <br /> AMPLIFIED ROCK MUSIC <br /> THUNDER <br /> RIVETER <br /> START OF UNSAFE LEVELS <br /> LOUD ORCHESTRA <br /> AVERAGE FACTORY <br /> CONVERSATION <br /> BACKGROUND MUSIC <br /> AVERAGE RESIDENCE - _- <br /> 4 SOFT MUSIC _ <br /> QUIET WHISPER <br /> ANECHOIC ROOM <br /> HEARING THRESHOLD <br /> 0 10 20 30 40 50 60 70 SO 90 100 110 120 130 140 <br /> JdBI (A weighting) <br />