[linux-audio-user] measuring sound volume

Patrick Shirkey pshirkey at boosthardware.com
Tue Mar 16 10:38:01 EST 2004

Steve Harris wrote:
> On Tue, Mar 16, 2004 at 11:54:49 +0900, Patrick Shirkey wrote:
>>I have been asked to work on a large outdoor party again this year.
>>This time we are going to have multiple zones with powerful equipment.
>>Can anyone give me some tips on appropriate spacing to enable a good mix 
>>of cleaness and sound fusion?
>>For example if I have 4 x 20KW systems how far apart from each other 
>>should they be so they don't overpower each other?
> I dont know how much SPL you get from the equipment, but if you are Xm
> from one speaker and X*2m from the other, the nearest one will only be
> about 12dB louder.
> the inverse square power law gives
> difference = (distance from A / distance from B)^2
> in dB's 20 * log10(difference);
> so to get 40dB's of difference (seems like a reasonable minimum) you have
> to be 10x nearer to the nearest stack than the next nearest.
> How loud those dB's appear to be depends on what the SPL is, I think you
> need more difference with a higher SPL, human ears compress, especially at
> high volumes.
> Hope that helps,
>    Steve


So if a zone is 10 meters a minimum distance between systems would be 
100 meters?

Could that be cut down to 50 to provide fusion at the edges of the zones?

Patrick Shirkey - Boost Hardware Ltd.
Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide
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