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Thread: n2400 crossover

  1. #16
    Senior Member Baron030's Avatar
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    Hi Bumba

    I did a little looking around and it appears that 1.4 mH is not a stock off the shelf size. Which means that if you were to replace your existing JBL coils, you most likely need to order a larger 1.5 mH coil and then remove winding to bring the inductance down to 1.4 mH. To be honest, I am only guessing that your existing JBL coils has an inductance of 1.4 mH. If you plan on replacing the JBL coils with something else than you will need an inductance meter and would need to measure your coils. And order replacement coils according to the actual measured value. And keeping the DC resistance of the replace coil a low as possible (under 0.5 ohms).

    If it was me, I would not replace the JBL coils and just replace the L-Pads and Caps and add the 5 ohm resistors.

    Baron030

  2. #17
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    Hello Baron,

    I noticed the missing 1.4mH while searching online too . Will keep the JBL coils, order other parts and work on it. Thanks for your helps and suggestions.

    bumba

  3. #18
    Senior Member berga12's Avatar
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    I'm Replicating C34 design speakers, I'm wondering if 6uF series on the 2402 are too big for the diaphagram (I know JBL developed like that....) but why cutting so low the 2402?

    thanks
    Luca

  4. #19
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    N2400 +9vdc ???

    Quote Originally Posted by Baron030 View Post
    If you are going to build all new N2400 networks from scratch, then consider updating the original design to include charge coupling and bypass caps as well. Here is a revised schematic: Baron030
    Baron, I've never ever seen a X-over with an external voltage. I'm totally confused. RSVP, thanks, Marty

  5. #20
    Moderator hjames's Avatar
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    Quote Originally Posted by 33 1/3 RPM View Post
    Baron, I've never ever seen a X-over with an external voltage. I'm totally confused. RSVP, thanks, Marty
    Well, this thread is over 2 years old since the last post.
    That said, charge Coupled networks are not a new concept, there have been many discussions over the years about loading the crossover in that fashion,
    with bypass capacitors and a 9v battery. Suggest you do a websearch on "charge Coupled networks" to learn more about the concept.
    Last edited by hjames; 02-08-2023 at 08:45 PM.
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

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