2dca5f4a   
   From: dpierce@cartchunk.org   
      
   ChrisCoaster wrote:   
   > I've always believed, growing up, that the speaker that   
    > moves more air yields more lifelike results.   
      
   Actually, the only thing that's unquestionably true   
   is a speaker that moves more air yields more acoustic   
   power:   
      
       P = pc^2 * sqrt(Sd * w^2 * x)   
      
   where   
      
       P = acoustic power (watts)   
       p = density of air, ~ 1.2 kg/m^3   
       c = speed of sound, 345 m/s   
       Sd = emissive area of cone in m^2   
       w = radian frequency, 2 pi F   
       x = peak excursion, in m   
      
   But what is often also true is that a speaker that   
   moves more air yields more distortion, especially   
   if Sd is small and x is large.   
      
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