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Excursion as a function of frequency for a known voltage

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  • Excursion as a function of frequency for a known voltage

    Hi All,

    I'm looking for an expression in which Peak Cone Excursion (not RMS cone excursion, and not peak-to-peak cone excursion) is the dependent variable, frequency is the independent variable, and the known constants are any relevant driver variables along with the RMS input voltage from the amplifier.
    In other words, I'm looking for the function that WinISD uses for its Cone Excursion graph.

    This is for an open-baffle application, so Fc=Fs and Qtc=Qts.

    Any ideas?

    P.S. My reason: I made an Excel spreadsheet that sums an arbitrary number of biquad filters, and graphs them, because in the miniDSP software the filter graphs are split into separate pages which makes viewing them in combined form impossible, and therefore determining the least attenuated frequency impossible, which I need to know in order to maximize headroom while preventing clipping from within in the DSP by setting the DSP output level. Now I want to combine the digital filters with the cone excursion curve and apply the same logic in order to maximum Xmax-limited headroom by setting the amplifier level.

  • #2
    I don't know what the function is but to model excursion just make the box size very large, like 100 cu ft. BTW, an open baffle doesn't necessarily have Fc=Fs or Qtc=Qts. The mere presence of a baffle will alter the specs.
    www.billfitzmaurice.com
    www.billfitzmaurice.info/forum

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    • #3
      The book you want to read is J.E. Bensen's "Theory & Design of Loudspeaker Enclosures", Prompt Publications, Revised Ed. 1996. ISBN-10: 0790610930.

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      • #4
        billfitzmaurice thanks, I actually can almost do what I need to do in WinISD, but it doesn’t seem to have the ability to enter custom biquads in the filter section. I also was not aware that the T/S parameters changed on open baffles, but after thinking about itit makes total sense. I’ll have to order a precise resistor and do my own measurements in ARTA.
        guitar maestro great suggestion. Book is ordered. Thank you.

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