XPost: sci.electronics.design   
      
   On Mon, 31 Dec 2018 22:39:02 -0600, "Tim Williams"   
    wrote:   
      
   >There was also the Philips "SEPP" with a pair of EL86? driving a 100s-ohms   
   >voice coil at good efficiency, but those speakers are so rare that this is   
   >practically a unique case.   
      
   Usually closer to 1000 ohms.   
      
   These speakers were sold for a few years, but later on, they went on   
   sale. Adding an 8:1000 ohm transformer and you could cheaply build a   
   good quality speaker box for an ordinary 8 ohm tube or transistor   
   amplifier :-)   
      
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