From: no@spam.com   
      
   On Fri, 13 May 2016 11:29:21 +0100, Wayne Chirnside  wrote:   
      
   > On Sun, 08 May 2016 00:47:57 +0100, Mr Macaw wrote:   
   >   
   >> I know what a servo motor is, and that you can get servo amplifiers (or   
   >> servo drives) to work with them, but what does it mean when a stereo   
   >> system says it has a servo amplifier?   
   >   
   > There is active circuitry to keep the bias at a point where the output   
   > tracks symmetrically between positive and negative voltage excursions.   
      
   I see.  Is this to prevent unnecessary DC current through the speaker creating   
   heat in the coil?  Or does it improve sound quality by leaving the cone   
   centred so it doesn't hit the ends of its movement?   
      
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