28efffcb   
   From: phil_a@tpg.com.au   
      
   "Patrick Turner"   
      
   Guitar amp speakers are a little odd because they usually have an open   
   backed cab,   
      
   ** The VAST  majority of  *separate* speaker cabinets used for guitar or   
   bass guitar have sealed backs. Combo amps that use SS circuitry also have   
   sealed back cabinets, in the main.   
      
   It is only valve guitar amps that are combos where open back cabinets are   
   the norm -  and then mainly to allow air to get to the inverted valves to   
   cool them.   
      
   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.   
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)