Re: [Phys-L] Acoustics: Does a speaker create a displacement antinode? (a different ?)

[Bernard Cleyet <bernard@cleyet.org>]

On 2014, Apr 08, , at 12:55, Bill Norwood <bnorwood111@gmail.com> wrote:

> Hi Jeff,
> Long shot here, but since you are looking a bit into audio:
> If one increases by 10 dB the sound level out of a speaker at a specified
> distance, by what factor has the amplifier power requirement increased?
> Thanks, Bill Norwood, U of MD at College Park


You mean sound pressure level????  by sound level OR do you mean sound intensity?

I  measured in Watt/m^2  
p        “         “     Pa


I proportional ~ to p^2     

http://en.wikipedia.org/wiki/Sound_intensity  


Sound pressure level (SPL) or sound level is a logarithmic measure of the effective sound pressure of a sound relative to a reference value. It is measured in decibels (dB) above a standard reference level. The standard reference sound pressure in air or other gases is 20 µPa, which is usually considered the threshold of human hearing (at 1 kHz).  

http://en.wikipedia.org/wiki/Sound_pressure  


from these and knowing the log manipulation rules “you” can find “your” answer.


bc lazy