• What I see is more or less - E-Stat 11:41:39 06/01/17 (0)
  In Reply to: RE: Is there an optimum room placement for a dipole? posted by Barry on May 31, 2017 at 20:30:29

  HP's rule of thirds in action. No cocktail napkin diagram necessary.
  
  Which I find works quite well empirically in my room. My distance to front wall was determined by measuring the most linear bass response in the bottom octaves.
  
  My seating position from the back wall is about the same.
  

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• RE: Is there an optimum room placement for a dipole? - Satie 21:18:04 05/31/17 (2)
  In Reply to: RE: Is there an optimum room placement for a dipole? posted by Barry on May 31, 2017 at 20:30:29

  Of course it is nice in theory but it is not realistic as at high frequencies the reflection null node will be very narrow and above 5khz you will be moving in and out of it as you make normal movements of your head. And for transient events you are more concerned with the reflection of the backwave arriving as late as possible and as attenuated as can be in order to make use of the precedence effect to obtain better clarity and spatial performance. . And you want the reflection's arrival time to be spread out as possible so that the reflected peak transient is of low SPL and has a much longer rise time than the direct radiated one.
  Also so long as your source is spread out horizontally - as the reflections that reach you from each driver would be from different angles they would have different path lengths, so you can have the cancellation occur for that one driver out of the 3 in a ribbon maggie. . Besides which planar radiators are fairly wide and radiate more uniformly than a cone. So reflections of output away from the center of the driver are just as strong as the central output.
  I saw this argument before and tried it and it didn't work beyond the lower mids, which for maggies is not the thing you want to have cancel out, you want to use the lowest bass modes to obtain a more substantial bass balance.
  The Limage placement makes more use of the room reflections and wall loading effects to get the most out of the planars - assuming room geometry works..
  

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  • RE: Is there an optimum room placement for a dipole? - Barry 06:29:44 06/01/17 (0)
    In Reply to: RE: Is there an optimum room placement for a dipole? posted by Satie on May 31, 2017 at 21:18:04

    Of course all of what you are talking about is covered on his site and his other presentations, except phase cancellation of side by side drivers. While it's not applicable to his speaker design, it is exhaustively covered in his crossover work for which he is famous.
    
    I do find this, and the Genesis speaker setup guidelines, two very insightful articles about how planers work and can be optimally positioned in rooms, but I don't set my speakers up exactly as either recommends.
    
    I am not an expert and no one will ever name xo filters after me.
    
    
    

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  • RE: Is there an optimum room placement for a dipole? - BDP24 00:36:24 06/01/17 (0)
    In Reply to: RE: Is there an optimum room placement for a dipole? posted by Satie on May 31, 2017 at 21:18:04

    Speaking of diffusers, what 6" deep designs can anyone recommend for the space between a pair of planars, on the wall behind them? It will be inserted into a 58" wide x 46" tall window whose bottom is 3' above the floor, centered between the speakers. Is wood the only serious choice, or are ones made of foam or other lightweight materials worth consideration?
    

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