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      1D Diffusion
        
      In 1983.RPG Diffusor systems.Inc.introduced the first commercial sound diffuser that offered uniform scattering over a designable bandwidth.The QRD has now been used in thousands of project in awide range of venues.
      

      

      

      

      

      


      
 
      
   
    
   
     
   
     
   
     
   
      
   	  
      
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