[OT] Decibels and the ear [was: Re: [plug] Hot and bothered CPU hankers for cool breeze]

[bern]

Not wishing to stir the pot but anything less than 85db is supposed to
be not damaging to the hearing
On Wed, 2003-12-17 at 10:56, James Devenish wrote:
> In message <20031217012435.GA15677 at pinion.innovative.iinet.net.au>
> on Wed, Dec 17, 2003 at 09:24:35AM +0800, Bernd Felsche wrote:
> > If dbA is mentioned, then it's sound pressure level with respect to
> > 20 micropascals at 1000Hz, the "least discernable" sound by the
> > human ear.
> [...]
> > 256 machines would be 8 * 3 dBA, i.e. 24 dBA louder if equi-distant
> > from the observer. 400 machines would be around 26 dBA louder.
> 
> Thanks.
> 
> In message <20031217012435.GA15677 at pinion.innovative.iinet.net.au>
> on Wed, Dec 17, 2003 at 09:24:35AM +0800, Bernd Felsche wrote:
> > On Tue, Dec 16, 2003 at 09:50:21PM +0800, James Devenish wrote:
> > > I'm not sure that the 'semantics' of aural decibels are well defined
> [...]
> > They are well-defined. Hence A-weighting for low to medium sound
> 
> After doing a bit of Googling, it seems Cameron really meant what he
> wrote for his initial comment that 10dB ~= twice as loud :-) So, a
> nominal three decade increase from 399 extra machines could be perceived
> as eight times louder than one machine, which is the sort of thing I was
> wondering about. Sorry everyone!
> 
> In message <3FDFBD8E.6070406 at postnewspapers.com.au>
> on Wed, Dec 17, 2003 at 10:21:02AM +0800, Craig Ringer wrote:
> > I wear earplugs at work (as I'm in here with the servers),
> 
> Heh, I used to wear earplugs when I was in a very quiet office. Maybe
> I should do the same where I am now, as I continually have nefarious
> thoughts about disabling the machine that's next to mine.
> 
> 
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