From: spam@spam.com   
      
   On Sat, 14 Apr 2012 10:20:37 +1000, "Phil Allison"    
   wrote:   
      
   >   
   >"Don Pearce"   
   > "Phil Allison"   
   >>>   
   >>>"John L Stewart"   
   >>>   
   >>>> Did an Impedance Plot for the speaker. I need to get me a white & pink   
   >>>> noise source. Would make that kind of measurement easier.   
   >>>   
   >>>** How so ??   
   >>>   
   >>>Impedance plots are best done with a slow sine wave sweep while feeding   
   >>>the   
   >>>speaker from a high impedance ( 600ohms plus) source.   
   >   
   >>>   
   >>   
   >> It is also vital that the speaker be placed well clear of the floor   
   >> and any other obstructions. Anything like that will show up as an   
   >> error in the impedance plot.   
   >   
   >** Bollocks.   
   >   
      
   Not bollocks at all. Particularly with a high efficiency speaker, you   
   can see the impedance plot squirm as you move things around near the   
   speaker. Bear in mind that it is a two way device, and can operate as   
   a sort of audio version of RADAR.   
      
   d   
      
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