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<blockquote data-quote="mrray13" data-source="post: 1119489" data-attributes="member: 540942">&quot;A&quot; scale is for &quot;noise&quot;, 500hz to 10khz, which is the area of greatest sensitivity for human ears. which is why OSHA uses the &quot;A&quot; scale. most noise at work falls well within this range.&quot;C&quot; scale is for the full frequency range, typically from 32hz thru 10khz. this is the scale used in musical applications....so, from my reading last night, i get this....150db is 150db regardless of frequency, BUT due to the human ear&#039;s sensitivity,150db anywhere in the A scale can cause more damage(both would cause instant hearing loss, but the higher frequency would be percieved to cause more as that&#039;s where our hearing is). and that&#039;s the only reason that 150db @25hz would be different then 150db @500hz...other then percieved sound.btw, most hearing loss, in manufactoring enviroments anyway, starts in the 4khz range..i&#039;ll get more info on this as my annual hearing test at work should be due...how close is that?wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif</blockquote>

[QUOTE="mrray13, post: 1119489, member: 540942"] "A" scale is for "noise", 500hz to 10khz, which is the area of greatest sensitivity for human ears. which is why OSHA uses the "A" scale. most noise at work falls well within this range. "C" scale is for the full frequency range, typically from 32hz thru 10khz. this is the scale used in musical applications.... so, from my reading last night, i get this....150db is 150db regardless of frequency, BUT due to the human ear's sensitivity,150db anywhere in the A scale can cause more damage(both would cause instant hearing loss, but the higher frequency would be percieved to cause more as that's where our hearing is). and that's the only reason that 150db @25hz would be different then 150db @500hz...other then percieved sound. btw, most hearing loss, in manufactoring enviroments anyway, starts in the 4khz range..i'll get more info on this as my annual hearing test at work should be due... how close is that? wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee [IMG]//content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif[/IMG] [/QUOTE]

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