XPost: sci.electronics.design   
   From: joseph_barrett@sbcglobal.net   
      
   On Wed, 25 Jan 2012 12:34:18 +1100, "Trevor"  wrote:   
      
   >   
   >"josephkk"  wrote in message    
   >news:5nhsh79fof4la03uog0ama3t8247kaf7fq@4ax.com...   
   >>Where does the energy for all that processing and mixing come from?   
   >   
   >Most commonly, batteries.   
   >   
   >Trevor.   
   >   
   And could you explain to me how all the battery power gets to headphone   
   sets that do not contain batteries, nor obtain such power from the base   
   device?  They shrilly claim to be noise canceling headphones as well.   
      
   ?-)   
      
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