BFD response graphs?

Discussion in 'Archived Threads 2001-2004' started by Jim A. Banville, Mar 5, 2002.

  1. Jim A. Banville

    Jim A. Banville Supporting Actor

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    What program are you guys using to make the response graphs in all the various BFD threads? Can you just plug in SPL numbers that you get from using a RS SPL meter and a "test CD"? I'm considering buying a BFD, but I'd like to make a "before" graph to see if I REALLY need a BFD in the first place [​IMG]
    thanks
    Jim
     
  2. brucek

    brucek Second Unit

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  3. BruceD

    BruceD Screenwriter

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    Many are using Excel with 1/6 octave graduations on the X axis and dB SPL graduations on the Y axis.

    Or you can use 1/3 octave logarithmic graduations on the X axis, like many of the magazine reviews. All depends on what you have for source tones on your test CD.
     
  4. Jim A. Banville

    Jim A. Banville Supporting Actor

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    Okay, thanks guys! Last question - how do you allow multiple line graph traces on the same graph (for before/after comparisons on the same chart)?

    thanks again

    Jim
     
  5. Mike Matheson

    Mike Matheson Second Unit

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    Jim,

    The Excel spreadsheet brucek linked to will give you a graph with before and after curves (Columns D & F in the spreadsheet).

    To be able to get fancier or to create your own new charts, try picking around in Excel's help system or maybe grabbing an Excel book. You'll pick it up pretty quick.

    Mike
     
  6. Pete Mazz

    Pete Mazz Supporting Actor

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    Go to Adire Audio's site and download ResGraph. Then, using Notepad, enter three columns, seperated by spaces for Freq, SPL, and phase (0). This would be a typical text file:

    20 87 0

    25 92 0

    31 86 0

    Save the file and then open it using ResGraph. You can then graph the response any number of ways.

    Pete
     

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