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Recapping L100's

Discussion in 'The Lansing Legacy' started by rocknroll1, May 12, 2018.

  1. rocknroll1

    rocknroll1 AK Subscriber Subscriber

    Messages:
    614
    Location:
    Huntsville, Al
    I am getting ready to have someone recap my 100's. The question is do I stay with the same design as the originals with upgraded parts and the pods removed with a resistor tap is installed, with settings of -2db, 0db, +2db on both midrange and tweeter or go with something like the Murphy design? The guy is comfortable doing either and cost difference is not important. I have owned these for about a year and they are all original except I did replace the grills and foam ring around the tweeter. They sound pretty good but they make some funny sounds sometimes when starting of and after turning system off. I am know expert but I am thinking it is crossovers causing this,
     

     

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  2. spark1

    spark1 Super Member

    Messages:
    1,290
    Location:
    The Great Midwest
    I would think odd noises at turn-on and turn-off are much more likely to be caused by your amplifier, as opposed to the passive crossover. If your system allows it turn your speakers off before powering the amp on or off.
     
  3. rocknroll1

    rocknroll1 AK Subscriber Subscriber

    Messages:
    614
    Location:
    Huntsville, Al
    But it has happened with 2 different receivers both restored within the last 3 years and it doesn't happen on any other speakers that have been hooked up to it. Even if its not the crossovers I think its time to recap them.
     
  4. 911s55

    911s55 AK Subscriber Subscriber

    Messages:
    500
    Location:
    Puget Sound
    By your description I'm guessing you have a cap coupled amp/receiver. They have a little woofer action on start up and shut down. If it bothers you leave the speakers off for the first 15 seconds or so and off before powering down, but no harm either way. Those JBL woofers are pretty eager so you might not have noticed with your other unit(s).
     
  5. rocknroll1

    rocknroll1 AK Subscriber Subscriber

    Messages:
    614
    Location:
    Huntsville, Al
    Back to main question though about recapping, original design or murphy design
     
  6. Zonker92

    Zonker92 All shiny and chrome Subscriber

    Messages:
    7,144
    Location:
    Central CA
    I’m facing the same dilemma with my Centuries and I have yet to resolve it in my mind. It’s a personal choice that has to balance originality, simplicity, efficiency and low cost on the one hand, against improved, more neutral sound on the other. Since I already have several pairs of much more accurate speakers, I’m leaning slightly toward a simple recap.
     

     

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  7. rocknroll1

    rocknroll1 AK Subscriber Subscriber

    Messages:
    614
    Location:
    Huntsville, Al
    I found a set on the bay that are built to order. They are based on the original ones with upgraded film capacitors. They are a little high but since I don't think I could do them myself probably not a bad deal. It also includes all new wiring.
     
  8. z-adamson

    z-adamson AK Subscriber Subscriber

    Messages:
    1,542
    Turn on and off noise is AMP related. I have an amp that makes a pretty bad turn off thump, so I set up a 4 pole double throw switch inline to shut off the speakers after turn on and before turn off. No more thump or risk of woofer damage.

    Original or Murphy? Original.
     
  9. Zonker92

    Zonker92 All shiny and chrome Subscriber

    Messages:
    7,144
    Location:
    Central CA
    Are those the ones where they replaced the L pads with resistors? They look fine, but losing the L pads would bug me. I like the adjustability, and seeing the knobs.
     
  10. rocknroll1

    rocknroll1 AK Subscriber Subscriber

    Messages:
    614
    Location:
    Huntsville, Al
    yes, you lose the L pads. It is set up pretty neutral.
     
  11. malden

    malden Addicted Member

    Messages:
    5,343
    This is just an idea but is it possible to have two crossover networks installed in the cabinets? If the amp has a speaker selector, then the speakers would have 2 pairs of terminals, one set per crossover.
     

     

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  12. Zonker92

    Zonker92 All shiny and chrome Subscriber

    Messages:
    7,144
    Location:
    Central CA
    You’d need a switch in/on the speaker to allow the drivers to be connected to only one network at any given time. Otherwise the other network would screw things up. That switch would have to switch over all three drivers each time (triple pole, single throw?). PITA.
     
    malden likes this.

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