"Joe L" <I'm@[EMAIL PROTECTED]
> wrote in message
news:5VBQj.92682$rd2.40010@[EMAIL PROTECTED]
>
> "liquidator" <mikeh@[EMAIL PROTECTED]
> wrote in message
> news:furbvr$368$1@[EMAIL PROTECTED]
> >
> > "Joe L" <I'm@[EMAIL PROTECTED]
> wrote in message
> > news:CV9Qj.90943$Cj7.58033@[EMAIL PROTECTED]
> >>
> >> "liquidator" <mikeh@[EMAIL PROTECTED]
> wrote in message
> >> news:fur45u$6rd$1@[EMAIL PROTECTED]
> >> >
> >> > "Eeyore" <rabbitsfriendsandrelations@[EMAIL PROTECTED]
> wrote in message
> >> > news:4810DF74.3D30BC3E@[EMAIL PROTECTED]
> >> >> I agree about the 3dB thing and ears. The commonly accepted norm
is
> > that
> >> > most
> >> >> people can hear 1dB volume increments but my point was that even
that
> > is
> >> > an
> >> >> underestimate for 'trained ears'.
> >> >>
> >> >
> >> >
> >> > Graham I think you can find lots better than 3 dB.
> >> >
> >> > Probably can also find worse.
> >> >
> >> > We need some ground rules to this though...
> >> >
> >> > I am willing to bet you your favorite brew most people on the
planet
> >> > cannot
> >> > consistently identify 139 dB versus 140 db.
> >>
> >>
> >> No, cause they'll be deaf. Do you know how loud that is?
> >>
> >> http://www.howstuffworks.com/question124.htm
> >>
> >>
> >> JL
> >>
> >>
> >
> > Trying to prove you can read?
> >
> > They won't be deaf, but will likely suffer damage, sepecially if the
> > exposure is more than very brief.
> >
> >
> > Besides, that ain't loud...Servotech cabs cancelling out the sound of
a
> > jet
> > engine...that is loud!
>
>
> I just thought your proposing of a listening test at 140db was absurd,
> pardon me for pointing it out. Carry on.
>
> JL
>
>
OK- may have misunderstood your point- so can I start over?
The assertion is ears can hear 1 dB.
There are Native Americans and people in Africa who can prolly do WAY
better than that in most situations- if naught else, Darwinism- couldn't
hear well, you got eaten, therefore didn't reproduce. Only those fleet of
foot an sharp of hearing survived...
But everything has to be qualified.
Ignore everything else- I still say you cannot tell the diff between 139
and 140 dB. I do not recommend trying the test.
Once you are well into pain, can you tell 1 dB differences? I say Hell
no.
Can you tell 1 dB differences at conversational levels in the human voice
range. Almost certainly unless you performed the test above that I didn't
recommend.
Ok, then can you tell 1 dB difference at 20 Hz?
I say no. Very likely animals can. Before that huge Tsunami a few years
ago
many animals ran inland- most like they were detecting some kind of low
level subsonic not apparent to humans.
So all test conditions have to be qualified...who is your listening
sample,
frequency range, volume range...and on and on.
Otherwise blanket statements are meaningless.
Make more sense now?
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