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Testing baffle edge treatments for tweeter diffraction.

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  • #61
    I've added a zip with 48PPO resolution txt files... should work hopefully. REW allows going down to 3 or 6PPO also if needed

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    • #62
      DaveFred ,

      I am attempting to compare your curves to various baffle diffraction simulation models. But in order to do so, I need to know exactly how far the tweeter is mounted down from the top of the cabinet (or up from the bottom). We know the baffle is 8 x 15" The tweeter is probably centered horizontally (4 inches from each side). But how far is the tweeter located down from the top of the cabinet? Looks like about 4 inches down from the top of the cabinet in your pictures, but this is only a guess. I re-read the thread but cannot find this value; please forgive me if I overlooked it. Also, how deep is the cabinet? Some modeling programs need the cabinet depth as well. Thanks. Bill
      SideTowers: http://techtalk.parts-express.com/fo...corundum-build
      Totally Flat: http://techtalk.parts-express.com/fo...5-totally-flat
      Plumber's Delight: http://techtalk.parts-express.com/fo...notech-winners
      Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build

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      • #63
        Originally posted by 4thtry View Post
        DaveFred ,

        I am attempting to compare your curves to various baffle diffraction simulation models. But in order to do so, I need to know exactly how far the tweeter is mounted down from the top of the cabinet (or up from the bottom). We know the baffle is 8 x 15" The tweeter is probably centered horizontally (4 inches from each side). But how far is the tweeter located down from the top of the cabinet? Looks like about 4 inches down from the top of the cabinet in your pictures, but this is only a guess. I re-read the thread but cannot find this value; please forgive me if I overlooked it. Also, how deep is the cabinet? Some modeling programs need the cabinet depth as well. Thanks. Bill
        4" down, cabinet 10" deep.

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        • #64
          Thanks. Here is a comparison of modeled vs. actual diffraction for the 7/8 radius round-overs. The top two curves, black and blue, are the on-axis model vs. actual. The 2nd set of 2 curves, green and red, are the 30 degree model vs. actual. And the bottom set of 2 curves, purple and gray, are the 60 degree model vs. actual. Curves are offset for clarity.

          There seems to be a fairly good agreement with the model. I generated these models and blended them using charlielaub "FRD Response Blender 2.0". I also modeled the square baffle curves and they showed fairly good agreement as well. I was unable to model either the Big bevel or Tapering Chamfer curves.

          Click image for larger version

Name:	Modell vs actual diff 7_8_ roundovers- tweeter 4in from top.jpg
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ID:	1427811


          SideTowers: http://techtalk.parts-express.com/fo...corundum-build
          Totally Flat: http://techtalk.parts-express.com/fo...5-totally-flat
          Plumber's Delight: http://techtalk.parts-express.com/fo...notech-winners
          Linehopper: http://techtalk.parts-express.com/sh...Esoteric-build

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