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Encyclopedia > Acoustic power

Sound power or acoustic power is a measure of sonic energy E per time t unit. It is measured in watts, or sound intensity J times area A:

The measure of a ratio of two sound powers is

where


W1 and W0 are the powers.


The sound power level PWL or LW of a source is expressed in decibels (dB) and is equal to 10 times the logarithm to the base 10 of the ratio of the sound power of the source to a reference sound power. It is thus a logarithmic measure.


The reference sound power in air is normally taken to be 10−12 watt = 0 dB SWL.


Notice: Usable music sound (trumpet) and noise sound (excavator) have both the same sound power of 0.3 watts, but will be judged psycho-acousticly totally different.




  Results from FactBites:
 
Sound intensity - Facts, Information, and Encyclopedia Reference article (287 words)
The sound intensity, I, (acoustic intensity) is defined as the sound power P
Z is the acoustic impedance, measured in N·s/m
Sound intensity level is a different measure used in acoustics.
Acoustic Power Vs Electrical Power (485 words)
Acoustic power, rather than electrical power, is the objective of a sound system.
For perspective, the relative acoustic power levels are shown in Table I in watts.
To illustrate how electrical power requirements are determined from the desired level of acoustical power, assume an area of 2400 square feet, and a hexagonal pattern with minimum overlap spacing which dictates 26 speakers for coverage.
  More results at FactBites »


 

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