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Thread: JBL L 100 Century early version crossover questions

  1. #1
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    JBL L 100 Century early version crossover questions

    Today I received crossovers that I bought from ebay. These are crossovers (LX-12-10) for early version of JBL L-100 Century. As you can see in the attached pictures it is unusual design. The one of caps and two inductors are inside of "cardboard ring" with some sort of glue. Do anyone know what the purpose of this design? I was thinking to recap, but I might have to replace those inductors too for recap. Also do I need to do the same thing when I replace capacitors. I also noticed that the gauge of wires for caps and inductors are different. Are they any reasons for that too? Thank you, Name:  DSC00187.jpg
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  2. #2
    Moderator hjames's Avatar
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    Looks like the beeswax they used to use to stabilize and
    hide components in the older metal can crossovers.

    probably melt it easy enough with a non-flame heat gun ... or powerful blow-dryer.

    you shouldn't need to replace the inductors - they wouldn't change, just the caps age ...
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
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    Thanks for your reply. That would save me some $$. Do you think I need to put back new cap in the beeswax pool for some reasons?

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    Moderator hjames's Avatar
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    Quote Originally Posted by he day View Post
    Thanks for your reply. That would save me some $$. Do you think I need to put back new cap in the beeswax pool for some reasons?
    I wouldn't think so - you could probably leave the chokes in there as is ...

    Looks like 2 caps is all there is to worry about!

    Schematic is here:

    http://www.jbl.com/resources/Brands/...NTURY%20ts.pdf
    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

  5. #5
    Senior Member grumpy's Avatar
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    Shoot... I'd just desolder the wire leads from the cap in the wax
    where they attach to the terminal board and let the beeswax be (so to speak).
    You could compare or return to original that way (and not damage the cardboard
    bits used to make up the crossover).

    Otherwise, I'd just build up a new masonite board with new
    L-pads and all.

  6. #6
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    OK I would just replace caps and leave others as they are. Thanks for your advice.

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