From: someone@anywheret.net   
      
   "JimD"  wrote in message news:2018082210582834513-email@nowherecom...   
      
   > I did find one java thing that lets you visualize dead spots that occur   
   > from speakers interacting.   
      
   > https://phet.colorado.edu/en/simulation/sound   
      
   Looks interesting but I wonder if being a simulation, accuracy is not   
   considered an important factor....or perhaps not.   
      
   > That can be used to hear and  " see "  low frequency phase cancellation   
   > effects.   I'll try and get band girl to look at it as a way of explaining   
   > why she sometimes can't hear the bass onstage.  She's almost always dead   
   > center between the pa cabs, angled in so we can hear them a little.   
      
   Unless there are phase cancelling reflections, it shouldn't be a problem.   
      
   > Ha, just realized, she wouldn't hear that effect if we had an onstage bass   
   > cab. No phase cancellation from a singe source amp.  Or, if she had her   
   > own crazy loud floor wedge.  Since we don't have those, she DOES hear   
   > cancellation issues ,,,, just like the audience does :-)   
      
   Jim   
      
   With low frequencies, the cancellation is quite noticeable, but you'd most   
   likely be experiencing it too.   
      
   Ouisie   
      
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