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Can anyone model this crossover?

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  • Can anyone model this crossover?

    I am using the Vifa XT25tg30 tweeter and this crossover.
    Can anyone model it please? I want to get a baseline to possibly modify it some.Click image for larger version

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  • #2
    Re: Can anyone model this crossover?

    It ends up attenuated about -4dB (so, running near 87dB), rolling off about -18dB/oct, with an F3 near 2.7k, and an F6 around 2.4kHz.
    Zmin is 3 ohms at 2.9kHz, and it ends up better than -36dB down at Fs (near 500Hz).

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    • #3
      Re: Can anyone model this crossover?

      Originally posted by Chris Roemer View Post
      it ends up better than -36dB down at Fs (near 500Hz).
      Is that net attenuation at Fs, or is that attenuation without impedance magnitude?
      Wolf
      "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
      "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
      "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
      "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

      *InDIYana event website*

      Photobucket pages:
      http://photobucket.com/Wolf-Speakers_and_more

      My blog/writeups/thoughts here at PE:
      http://techtalk.parts-express.com/blog.php?u=4102

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      • #4
        Re: Can anyone model this crossover?

        Total drop (below unfiltered output) is -38dB @ 500Hz, -48dB @ 400Hz. (That's about -34 and -44 below the shelved "nominal" level, between about 4k-16kHz.)

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        • #5
          Re: Can anyone model this crossover?

          So if the resonance magnitude is +10dB, then it'll almost be -30dB down at resonance.
          This might require some Fs compensation.

          Later,
          Wolf
          "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
          "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
          "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
          "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

          *InDIYana event website*

          Photobucket pages:
          http://photobucket.com/Wolf-Speakers_and_more

          My blog/writeups/thoughts here at PE:
          http://techtalk.parts-express.com/blog.php?u=4102

          Comment


          • #6
            Re: Can anyone model this crossover?

            Originally posted by Chris Roemer View Post
            Total drop (below unfiltered output) is -38dB @ 500Hz, -48dB @ 400Hz. (That's about -34 and -44 below the shelved "nominal" level, between about 4k-16kHz.)
            Does that have a roll off after 16khz?

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            • #7
              Re: Can anyone model this crossover?

              If you mean above 16k, then likely no. The tweeter may have a very small dip before the last rise to 20k though. That's inherent in its response. If you want a lift- Use a 1.5uF in parallel with the series resistor.

              Later,
              Wolf
              "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
              "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
              "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
              "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

              *InDIYana event website*

              Photobucket pages:
              http://photobucket.com/Wolf-Speakers_and_more

              My blog/writeups/thoughts here at PE:
              http://techtalk.parts-express.com/blog.php?u=4102

              Comment


              • #8
                Re: Can anyone model this crossover?

                Click image for larger version

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                Grey is unfiltered, and red is with your specified filter. This does NOT include any baffle effects, but those are typically strongest below around 2kHz anyhow.

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                • #9
                  Re: Can anyone model this crossover?

                  Thanks for the input guys!

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