From: phil_a@tpg.com.au   
      
   "John L Stewart"   
      
   > My Grandsons PV JSX that I worked on has 4X 12 inch speakers with the   
   > back closed.   
      
   ** Told ya.....   
      
   A few hours ago I posted this:   
      
   "  JLS has not revealed whether his example of the PV JSX is a combo or a   
   head -  but a resonant peak in the impedance at 137Hz suggests it is a head   
   with a sealed cabinet. "   
      
      
   > With all this theory being spouted did anyone mention that DF don't   
   > matter much beyond about 10 because speaker R gets in the way.   
      
      
   ** Never come across a tube guitar amp with a DF of more than 5.   
      
       Some ( eg the VOX AC30 ) have a DF of about 0.1.   
      
      
      
   ...   Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)