JBL L300 Summit Restoration.

Discussion in 'The Lansing Legacy' started by Zonker92, Feb 27, 2018.

  1. Zonker92

    Zonker92 All shiny and chrome Subscriber

    Messages:
    7,021
    Location:
    Central CA
    Some work went into these. I've been dreaming of Summits since 1978 or so. Bart hooked me up with the cabinets; he is the man!

    New wood bases.
    New feet.
    Totally rebuilt grill frames, with bamboo reinforcing ribs.
    New grill cloth (Huntley Audio on the 'bay).
    Factory-recone kits on 2235H woofers.
    Radian diaphragms on LE85 horn drivers.
    New felt inside LE85 horn drivers
    Lightly touched-up H92 horns.
    New OEM diaphragms on 077 tweeters.
    New tweeter badges with hand-faked serial numbers.
    New factory O-rings on all driver mountings.
    All fasteners cleaned and polished.
    New grill cloth.
    Delrin grill pegs.
    New Kenrick horn lenses.
    New horn lens Velcro.
    Upgraded OEM binding posts on MF and HF drivers.
    Upgraded binding posts on cabinets.
    Cabinets hand-drawn by architect father in law, now being CAD drawn.
    Pass-inspired charge-coupled crossovers on custom PCBs.
    All new internal wiring.
    All veneer cleaned and oiled.
    All other surfaces repainted.
    L pads dismantled, cleaned, bathed in Deoxit and reinstalled.
    Foilcals removed, polished and reinstalled.
    New glass tops.
    New foam cores under glass.
    New hang tags (thanks, Roberto!).

    Now I need just to repaint and reinstall the grill badges. But the Summits already sounding primo!

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    Last edited: Mar 15, 2018
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  2. Zonker92

    Zonker92 All shiny and chrome Subscriber

    Messages:
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    More:

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    Last edited: Mar 1, 2018
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  3. turboyam

    turboyam The Kenwood fan!

    Messages:
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    Location:
    Quebec Canada
    Ohhhhhhh!!! you did good! :beerchug: And air core inductors!, awesome work!
     
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  4. Johnny_Law

    Johnny_Law AK Member Subscriber

    Messages:
    1,694
    Location:
    North Bay, NorCal
    Beautiful work! I have the same Barzilay cabinet! :bigok: And can spy some other sweet JBLs ... :bowdown:
     
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  5. faber12

    faber12 AK Subscriber Subscriber

    Messages:
    3,910
    Location:
    Northwest Ohio
    Beautiful!

    I am sure they sound as good as they look too.

    Thank you for the pictures of the grills, they are the first I have seen that show the framework and how they are constructed. I would love more, and a few dimensions if you are willing.

    Excellent work, as I expected when I saw your thread. :)

    @Valveglow you will love this.
     
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  6. Stan man

    Stan man Active Member

    Messages:
    407
    D---- Zonk,
    a real pro job! I read you're liking their sound, but are they as good as what you'd hoped for and worth the 40 year wait?
    Love to hear them.

    Stan
     
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  7. cason

    cason AK Subscriber Subscriber

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    Wowzer!
     
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  8. MCM_Fan

    MCM_Fan AK Subscriber

    Messages:
    2,086
    Location:
    Oregon
    I can't possibly "like" this post enough! Those are stunning, absolutely stunning. I can only imagine how great they sound. The entire room looks amazing.

    A couple questions on the Nelson Pass crossovers: where did you get the PCBs and what gauge inductors did you use? I'm about to build a pair of Nelson Pass crossovers for another AK member. I'm using all 14 gauge Erse XQ air core inductors and was planning to go with point to point wiring on an MDF or plywood substrate.
     
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  9. Zonker92

    Zonker92 All shiny and chrome Subscriber

    Messages:
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    Thanks for all the props! MCM, I had the PCBs custom made; I drew up schematics, a fellow converted them to CAD, then I uploaded them to a company in China that printed them for me. Let me know if you need some names.

    The coils are 18-gauge; I did not want to break the bank and it's consistent with JBL OEM coils.

    faber, PM me about the drawings.
     
    Last edited: Feb 27, 2018
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  10. Drugolf

    Drugolf AK Subscriber Subscriber

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    Sweet! Great great work man. Enjoy those beasts!
     
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  11. toddalin

    toddalin Super Member

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    2,170
    Very nice work.
     
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  12. onwardjames

    onwardjames Hoardimus Maximus Subscriber

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    There's restoring speakers like I do it, and most everyone else as well.

    Then there is Zonker's way of doing it.

    Hat is off, sir.
     
  13. damacman

    damacman Blown and Injected Subscriber

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    OMG man - in addition to the big guys?
     
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  14. bigaltx24

    bigaltx24 Super Member

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    1,441
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    :eek2:Those are gorgeous
     
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  15. daveg3588

    daveg3588 Toy addict Subscriber

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    Bless you craftsmanship, you have a gift.
     
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  16. GD70

    GD70 AK Subscriber Subscriber

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    Dayum! Stunning on every level Zonk!
    How long did this project take?
    Cheers, Glenn
     
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  17. RS Steve

    RS Steve Tube Junkie Subscriber

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    Nice work as usual Zonk, curious to see if you like them better than the 4435's. :thumbsup:
     
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  18. hjames

    hjames dancing madly backwards ... Staff Member Moderator Subscriber

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    That is just some superb work ... and custom PCBs? Exceptional!!
     
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  19. Alobar

    Alobar Pulling out of the Last Chance Texaco.. Subscriber

    Messages:
    4,969
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    That's off the charts! Truly outstanding work.. How do you like the Radian diaphrams? I found them to sound practically identical to the originals in my L200's.
     
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  20. Speedbump71

    Speedbump71 Buried in speakers Subscriber

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    750
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    Dandridge, TN
    Beautiful work.
     
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