How loud is 75 Db.a

The sound pressure is analogous to voltage, so a 3 dB increase would
correspond to a ratio of 1.414 in sound pressure and a ratio of 2.0 in
sound power.

Thanks, Bob. Hopefully I'm recalibrated now!

Chuck

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In article <a5puq25tc3mprhmeucp5fr1shd7p3gip8g@4ax.com>, feebo wrote:

On Tue, 16 Jan 2007 06:12:33 -0800, Don Bruder <dakidd@sonic.net
wrote:

In article <1168954613.549784.198800@m58g2000cwm.googlegroups.com>,
number1hatfielder@hotmail.com wrote:

I have purchased an industrial shredder. The noise it produces is 75
Db.a. How loud is this?

Quite.

If anyone could give me any exmples of popular sounds which match
this volume i would be greatful.

Google is your friend.

Would i require ear protectors?

Yes.

twat

*plonk*
Click to expand...
<snicker>

Now THAT'S funny!

A clear, concise, and correct answer gets a plonk. <heheheheh> Just
proves that on the internet, idiots (especially anonymous ones) abound.

--
Don Bruder - dakidd@sonic.net - If your "From:" address isn't on my whitelist,
or the subject of the message doesn't contain the exact text "PopperAndShadow"
somewhere, any message sent to this address will go in the garbage without my
ever knowing it arrived. Sorry... <http://www.sonic.net/~dakidd> for more info
 
Bob Masta wrote:

chuck <nospam@nospam.org> wrote:
Phil Allison wrote:

SNIP


** A 3 dB level variation is NOT "twice as loud " - you ass.

It is merely a just noticeable increase.

Absolutely correct, Phil. I meant to say twice the sound pressure level.


Actually, it's twice the sound *power*, but only the usual 1.414 times
the *pressure*.
Click to expand...
Twice the power doesn't sound twice as loud though.

Graham
 
Hey Phil.... I've hear some folks say 6dB is 'twice as loud' and others
say 10db is twice as loud. What's your opinion?
 
"BobG"

Hey Phil.... I've hear some folks say 6dB is 'twice as loud' and others
say 10db is twice as loud. What's your opinion?
Click to expand...

** 10 dB is generally taken to be the increase in SPL required to make the
majority of listeners declare ".... that is now twice as loud".




......... Phil
 
On 2007-01-18, Don Bruder <dakidd@sonic.net> wrote:
In article <a5puq25tc3mprhmeucp5fr1shd7p3gip8g@4ax.com>, feebo wrote:

On Tue, 16 Jan 2007 06:12:33 -0800, Don Bruder <dakidd@sonic.net
wrote:

In article <1168954613.549784.198800@m58g2000cwm.googlegroups.com>,
number1hatfielder@hotmail.com wrote:

I have purchased an industrial shredder. The noise it produces is 75
Db.a. How loud is this?

Quite.

Would i require ear protectors?

Yes.

twat

*plonk*

snicker

Now THAT'S funny!

A clear, concise, and correct answer gets a plonk. <heheheheh> Just
proves that on the internet, idiots (especially anonymous ones) abound.
Click to expand...
correct? hearing damage doesn't occur at 75 dBA

Bye.
Jasen
 
Phil Allison wrote:
"BobG"

Hey Phil.... I've hear some folks say 6dB is 'twice as loud' and others
say 10db is twice as loud. What's your opinion?


** 10 dB is generally taken to be the increase in SPL required to make the
majority of listeners declare ".... that is now twice as loud".

........ Phil
..
Click to expand...
The human ear is a logarithmic device.

We were instructed that the human ear (at normally audible frequencies
within normal hearing level range etc.) can 'just' detect a doubling of
sound.

i.e. twice the power is detectable.

The logarithmic ratio of 2/1 = 0.3; that's 0.3 Bels. So that's 3
decibels.

Six decibels would be doubling the power, twice. (3 dB and 3db again)
That is four times the power.

Ten db? Another four, to make ten dB is more than double that again
i.e. eight times the original power plus some more! (3 + 3 + 3 +1 = 10)

So for practical purposes a change of plus/minus 10 dBs would most
clearly be apparent to most people.

BTW. For a ten dB change; the logarithmic ratio of ten = 1.0 (We are
back to Bel's again!)
So that's ten decibels. So quite by coincidence as it were, plus ten
decibels (+10 dB) is ten times the original power or loudness or
whatever of the original.

Have we got everybody confused now.

Lets say in comparison to an original power or loudness level of one
(1) watt.

Power watts. Bels compared to original.
Decibels to original.

2 0.3
+3
4 0.6
6
8 0.9 *
9
16 1.2
12
32 1.5
15
64 1.8
18
128 2.1
2

* for example using a calculator, mathematical tables or even an old
'slip stick' (slide rule) if here are still any around you can look up
the logarithm of 8 and it is 0.9031. So eight times the power is 0.9
Bel's or 8 decibels.

That little table of noise levels looks useful no matter what is the
reference.
 
"terry" <tsanford@nf.sympatico.ca> wrote in message
news:1169245192.830791.10870@m58g2000cwm.googlegroups.com...

** Groper Smartarse Alert



** 10 dB is generally taken to be the increase in SPL required to make
the
majority of listeners declare ".... that is now twice as loud".



The human ear is a logarithmic device.

We were instructed that the human ear (at normally audible frequencies
within normal hearing level range etc.) can 'just' detect a doubling of
sound.
Click to expand...

** Then YOU were instructed WRONG !!!!!!!!!!

The smallest SPL change that is just noticeable by most people is 1 dB.


( snip rest of this fool's incomprehensible drivel)



....... Phil
 
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