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How to obtain FRD and ZME files from Images?

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  • How to obtain FRD and ZME files from Images?

    Hello, I'm new to the speaker world, Please, is it possible to generate the FRD and ZMA files from this images that can be used for XO design? The speaker is a Jbl Selenium 12" Pw7, This images are from the manufacture. Isn't this images missing some numbers to the right of them? Can anyone help me to get them please? ​

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  • #2
    There used to be a program called SPL trace that could be used to generate data files from the graphs. I don't know if it's available anymore, but VituixCAD is a whole suite of speaker design software which contains this functionality. You upload the image and specify what the scale is for each axis. It will then "trace" the curve and generate the data file.

    The plots you have look complete to me. The x-axis is frequency for both plots. The y-axis is on the left side and contains SPL for the frequency response, and ohms for the impedance. Keep in mind the SPL numbers are taken from an infinite baffle and will not contain any diffraction or baffle-step loss that you will see in an actual enclosure.


    • #3
      Thank you so much for your input 1100xxben, yes I am familiar with VituixCad, I did the driver there to get the FRD and ZMA files, but could not do the same with the woofer. I Thoth I was missing something, Chris Roemers pass me the files I need it and I was able to star working with my first xover. Thank you so much for your input help.


      • #4
        Just something to know as a newbie to this - you cannot successfully design a crossover by only tracing the manufacturers plots. At the very least you need to apply baffle step losses to your files and a diffraction model based on your baffle design and driver placement.

        Once you've done that, you will also need to apply driver offset information to the crossover simulation in vituix. Only after you've done all that would you be in a position to determine if your speaker concept is workable - the next step is to obtain the drivers, build the box and take actual measurements to then model a final crossover design.

        If this is your first venture in speaker design - the collective voice of all experienced forum members across the internet will be "build a proven kit design first" - and for good reason.

        Should you wish to dive in and go it alone, aside from the recommended reading on speaker design itself, you will need to become very familiar with:

        1) Modelling theoretical designs from available manufacturer data. A useful guide for tracing and modelling data for simulation can be found here:
        2) Taking real measurements and preparing the files for crossover simulation:
        Constructions: Dayton+SB 2-Way v1 | Dayton+SB 2-Way v2 | Fabios (SB Monitors)
        Refurbs: KLH 2 | Rega Ela Mk1


        • #5
          Dezzar, you are sooo right and clear. Thank you for all your input. I have learned so much more in two post that I read here , than in my whole research. Ho well, hopping my next project is more educated!


          • #6
            Fprawn graph tracer is the best I've come across. He was a poster here, but it seems stated in some places the software was not where he formerly hosted it.
            Diyaudio has it hosted for the future...
            see if this works:

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