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Thread: JBL TL260 midrange problem

  1. #11
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 73,425
    I'm Grant.

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    Any possibility that the polarity of wiring into the banana's is wrong? or on the speaker line.. other possibles is a bad connection or banana socket, or if bi wireble the biwire link
    Regards,
    Grant .... ؠ

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  2. #12
    Join Date: Apr 2016

    Location: Bergen, Norway

    Posts: 39
    I'm Andre.

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    Quote Originally Posted by walpurgis View Post
    Presumably the open back midrange driver is in its own inner enclosure. Is there anything loose inside? Another possibilty and quite a common one is a wire or damping material touching the back of the cone.
    In it's own enclosure. The cables don't touch, and the damping material don't touch. I was also thinking about this, so tested it not installed, just the driver on a chair playing music.

    The speakers sound amazing. So no emergency really. But very annoying why one driver behave different than the other identical driver. Even tried playing directly from dac and into one power amp to eliminate that the fault was not in my system. Changed the speaker terminals by connecting the left speaker on the right and vice versa= SAME.
    Marantz HD-DAC1 -> Hitachi HMA-8500 Mk II -> JBL TL260 limited edition

  3. #13
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

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    In that case, get the capacitors checked again and double check joints. There has to be a cause.
    The word is 'valves' in this country, not tubes. Tubes are what Smarties come in!

  4. #14
    Join Date: Apr 2011

    Location: cheltenham

    Posts: 691
    I'm matt.

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    If it's an intermittent fault (probably is because you're getting some sound), swapping stuff over could have temporarily fixed the problem (that's why I suggested wiggling wires, crossover components etc).

    I found a dodgy transistor once by tapping all the components with a pencil whilst music was playing. The bad one made a 'pop' sound when it was tapped.

  5. #15
    Join Date: Apr 2016

    Location: Bergen, Norway

    Posts: 39
    I'm Andre.

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    Quote Originally Posted by walpurgis View Post
    In that case, get the capacitors checked again and double check joints. There has to be a cause.
    I agree. Just need to find motivation.

    Quote Originally Posted by fatmarley View Post
    If it's an intermittent fault (probably is because you're getting some sound), swapping stuff over could have temporarily fixed the problem (that's why I suggested wiggling wires, crossover components etc).

    I found a dodgy transistor once by tapping all the components with a pencil whilst music was playing. The bad one made a 'pop' sound when it was tapped.
    Yes, that is next step now. I will take out all 5 drivers and line them up on the table together with crossover. Cable it all up with temporary cables and see where it brings me. Possible the right cabinet is cursed, so hooking up outside might break the spell.
    Marantz HD-DAC1 -> Hitachi HMA-8500 Mk II -> JBL TL260 limited edition

  6. #16
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 29,531
    I'm Martin.

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    Cabinet cursing. I've dealt with that before. First you need to catch a leprechaun. Dig a hole, fill it with Lucky Charms and cover it over with branches and leaves. Come back to me when you have the little fellar and I'll tell you the next step.
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  7. #17
    Join Date: Oct 2020

    Location: London

    Posts: 3
    I'm James.

    Default Did you fix it in the end?

    Hi.

    I know this thread is years old, but I have the exact same problem with my JBL TL20.
    Midrange driver is practically non existent on Left speaker and slightly more than nothing on the right.

    Did you ever manage to sort the problem you had?

    Jimbobj

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