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Max SPL of a Driver - Frequency - SPL - Excursion

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  • Max SPL of a Driver - Frequency - SPL - Excursion

    Can someone explan the math or refer to an online calculator to calculate the power, excursion over frequency range on a driver as described in this article I was reading here.
    http://www.audioxpress.com/article/D...-Way-Speakers1
    Probably somewhere. I don't have time to search for 2 hours, right now!!

  • #2
    Originally posted by Sigil View Post
    Can someone explan the math or refer to an online calculator to calculate the power, excursion over frequency range on a driver
    I'm not aware of anything on-line with that capability. Speaker modeling software, WinISD 0.7 and HornResp for instance, will do so.

    www.billfitzmaurice.com
    www.billfitzmaurice.info/forum

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    • #3
      Another thing to concider is because a speaker will handle the power, or not mechanically break, does not mean all of its capability is pratically usable.

      All sorts of non-linearites can make a speaker just sound awful when pushed.

      I will target an output and system F3 as part of the initial design phase when selecting drivers if output is a primary concideration, but the truth if the matter is in most home audio system just about all drivers have enough output unless younare looking for bottom octave at 100dB plus.
      .

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      • #4
        Originally posted by Sigil View Post
        Can someone explan the math or refer to an online calculator to calculate the power, excursion over frequency range on a driver as described in this article I was reading here.
        http://www.audioxpress.com/article/D...-Way-Speakers1
        Probably somewhere. I don't have time to search for 2 hours, right now!!
        These equations are in several textbooks ( ex. Acoustics - Book by Leo Beranek )
        and Linkwitz has material on his site.
        example: http://www.linkwitzlab.com/SPL%20nomographs.htm
        "Not a Speaker Designer - Not even on the Internet"
        "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

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        • #5
          This might help. You can down load the excel spread sheet using the link at the top of the last paragraph. http://musicanddesign.com/V_for_Xmax.html
          John k.... Music and Design NaO dsp Dipole Loudspeakers.

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          • #6
            Originally posted by Sigil View Post
            Can someone explan the math or refer to an online calculator to calculate the power, excursion over frequency range on a driver as described in this article I was reading here.
            http://www.audioxpress.com/article/D...-Way-Speakers1
            Probably somewhere. I don't have time to search for 2 hours, right now!!
            Just use the Sd of the driver to compare. For example, a 10" woofer has approximately 2.5 times the area of a 6.5". For a given spl, the 6.5" will have 2.5 times the excursion of the 10" woofer. So, a 10" playing comfortably at 3mm of excursion, can be matched in SPL by a 6.5" thrashing around at 7.5mm. Odds are good that the 10" will sound better at this SPL than the 6.5". Cut the SPL down by 6dB, and both drivers are likely to sound about the same, as the 6.5" driver excursion is now at about 4mm.

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            • #7
              That helps, thx, appreciated!!

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              • #8
                Try the "Pro" (alpha) vers. of WinISD from www.linearteam.org .

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