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Crossover help part 2

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  • #16
    Hi Guys,
    Well, I'm back again with my latest Xover attempt. I got a lot of help from John Hollander a few days ago on some very basic X Sim usage and started playing around with second order filters on both the woofer and tweeter. I tried to incorporate Chris's idea for an Lpad and Wolf's suggestion to cross the tweeter higher. In order to get a higher crossover point with my present limited skills I had to go with a lower inductor value but the crossover point is now 2.7K. The frequency response doesnt look great, but the sound is significantly better overall than with any of my previous efforts. The detail and harmonic richness are even better than before, the dynamic range wider and the sense of being drawn into the music much more pronounced. Overall I think they sound darn good. I am not sure what has caused the changes but they are definitely apparent.
    What bothers me now is that the FR drops off a cliff from 9.5K up. My hearing cuts off at 10K so I'm thinking anyone with normal hearing will feel they are very dull. I've tried manipulating the values of every component in the crossover in X Sim and couldn't find a way to bring the 10-15K range up without messing things up down lower. Ideas for how to help this would be much appreciated and also other thoughts about things to try to get the best out of these very nice drivers.
    Thanks!
    Jay
    PS The Y axis graduations are 5db.

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    • #17
      Place about a 1uF across the 15 ohm resistor, and see what that does.
      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


      • #18
        Try using smaller resistors for the tweeter padding in your sim, and see if that works too. Drop the 10 ohm down to about 4 ohms, and the 15 ohm down as needed.

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        • #19
          The lower the shunt resistor gets in value, the more current will flow through it. I'm not in the camp of using a resistor of low value in parallel with a driver as they can get hot.

          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


          • Serpentus
            Serpentus commented
            Editing a comment
            Could one simply use 2 double value paralleled if you're worried about heat?

            Or are you talking about ambient temperature in general inside the box?

        • #20
          No, you have it right. You could double-up, but if a single resistor works, why shunt more current?
          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


          • #21
            Wolf is right Drjay. If you were to use a 4 ohm shunt resistor, and feed this speaker about 128w, the resistor might get slightly warm. The woofer on the other hand will probably be starting the box on fire. Your smoke alarm would be sounding a warning, but you would be unable to hear it over the speaker, as you would probably loose the rest of your hearing in that range. Just having some fun with ya.

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            • #22
              A 1.5 uF cap arcoss the 15 ohm resistor helped a lot with the over 9.5 K frequency response; changing the Lpad values helped some up high, but resulted in a plus 5db hump in the 5-8K range. I'm still plugging away and will post an update in a couple of days. Many thanks for the input!
              Jay
              Last edited by Drjay; 01-20-2020, 08:35 AM.

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              • #23
                Click image for larger version

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                Click image for larger version

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                Might be worth a try

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