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  • Thoughts on shielding x-over components

    I was thinking about my unshielded subwoofer and how it makes the wires that run near it sway because of the field, and I was thinking: "I wonder if the flux through the capacitors could cause an audible difference between them and a 'shielded' components". I don't know if this has every been done at all, or if there's any kind of precedent to doing this. I've heard that the metals you use between the components and also the mounting hardware for the component board having a fairly significant difference in SQ.
    I feel like the changing fields of a non-shielded speaker could cause a change in the required voltage to pass through a capacitor, due to field charges / surface charges of the internal windings. I'm not really sure of it, but I figured this to be the right place to introduce the idea.

    SCRATCH YOUR BRAINS!

  • #2
    Re: Thoughts on shielding x-over components

    Originally posted by Adam_G View Post
    I was thinking about my unshielded subwoofer and how it makes the wires that run near it sway because of the field, and I was thinking: "I wonder if the flux through the capacitors could cause an audible difference between them and a 'shielded' components". I don't know if this has every been done at all, or if there's any kind of precedent to doing this. I've heard that the metals you use between the components and also the mounting hardware for the component board having a fairly significant difference in SQ.
    I feel like the changing fields of a non-shielded speaker could cause a change in the required voltage to pass through a capacitor, due to field charges / surface charges of the internal windings. I'm not really sure of it, but I figured this to be the right place to introduce the idea.

    SCRATCH YOUR BRAINS!
    I can't answer your question.

    Once I read the words 'flux through the capacitors' all I could think about was Doc and Marty and that Delorean.



    That's what a severe lack of sleeps gets me.

    TomZ
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    • #3
      Re: Thoughts on shielding x-over components

      How do you know the wires sway because of the field? Any chance changes in internal pressure make them move?

      You'll notice that even the most experienced designers, for all their measuring of response, aren't shielding crossovers. Neither are the commercial designs.


      Originally posted by Adam_G View Post
      I was thinking about my unshielded subwoofer and how it makes the wires that run near it sway because of the field, and I was thinking: "I wonder if the flux through the capacitors could cause an audible difference between them and a 'shielded' components". I don't know if this has every been done at all, or if there's any kind of precedent to doing this. I've heard that the metals you use between the components and also the mounting hardware for the component board having a fairly significant difference in SQ.
      I feel like the changing fields of a non-shielded speaker could cause a change in the required voltage to pass through a capacitor, due to field charges / surface charges of the internal windings. I'm not really sure of it, but I figured this to be the right place to introduce the idea.

      SCRATCH YOUR BRAINS!
      I was so much older then, I'm younger than that now.
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      • #4
        Re: Thoughts on shielding x-over components

        @TomZ Haha, I thought of Doc when I read over it too! Every time I heard flux in my Electricity and magnetism class I laughed a little.

        @fastbike1 I know the wires sway because of the field because I was playing with them hanging them over the field. It was pretty funny, but I'm a nerd. It's not like they were going crazy just a little motion. I also put a Neo magnet on top of the sub and watched it dance around from a combination between the vibration and the magnet, it would spin from the magnet and slide from the vibration, but it self-centered. You'll have to try it some time.

        I know that none of the designs I have ever seen have implemented a shielded crossover, and I was just introducing the concept to see if anyone had ever played around with it. I think that it could potentially have some benefit/effect, but I don't really know. I figured I'd put the brains of the PETT forum to work on it.

        If some brave soul wants to play around with the concept, or has their $.02, please toss it in!

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        • #5
          Re: Thoughts on shielding x-over components

          Most of us just don't, um, mount our crossover(s) on the subwoofer magnet. :rolleyes:

          Bad enough the sound that comes from caps and coils even in the absense of an external magnetic field . . . :D
          "It suggests that there is something that is happening in the real system that is not quite captured in the models."

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