JBL Lancer 77's I Am Impressed!

Discussion in 'Speakers' started by dc270, Oct 6, 2007.

  1. dc270

    dc270 Now Off The Reservation..... Subscriber

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    WOW to be a speaker system of 40 years aged- they are really nice to listen to. They are voiced darned well for a 9" mid bass, 2" cone tweeter, two way system- these had to have been one of JBL's better efforts of the day!

    I just finished a weeks worth or refoams and cabinet restorations on these. I think these turned out quite pleasant considering what I originally had to work with! :banana:

    If you have the chance do listen to a pair of these- surely one of the strongest sounding 2 ways ever made in my book-especially for the time!
    DC
     
    Last edited: Mar 4, 2009
  2. Zilch

    Zilch Curve Junkie Subscriber

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  3. jbpollock

    jbpollock AK Subscriber Subscriber

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    They look good. Nice work!
     
  4. dc270

    dc270 Now Off The Reservation..... Subscriber

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  5. Giskard

    Giskard Member

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    :lmao:
    Cool! :)
     
  6. dc270

    dc270 Now Off The Reservation..... Subscriber

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    Nice Avatar! What are those?
    DC
     
  7. Zilch

    Zilch Curve Junkie Subscriber

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    Let's see what Giskard might suggest, if he will, please, Giskard?? :thmbsp:
     
  8. ekmanning5

    ekmanning5 Time has told me... Subscriber

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    I have a pair I would like to refoam. Where did you get the refoam kits from?
     
  9. Zilch

    Zilch Curve Junkie Subscriber

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  10. dc270

    dc270 Now Off The Reservation..... Subscriber

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  11. Zilch

    Zilch Curve Junkie Subscriber

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    Crossover is 12 dB/octave @ 2500 Hz.

    Oddly, JBL doesn't suggest a substitute:

    http://manuals.harman.com/JBL/HOM/Technical Sheet/L77 Lancer ts.pdf

    JBL 035tiA would be my first choice, if it'd fit; I kinda doubt it, since it's 5" diameter.

    JBL 053ti may be a little smaller. JBL crosses it at 2.5 kHz in 4408A, but 18 dB/octave, a simple crossover mod:

    http://www.jblproservice.com/pdf/Studio Monitor Series/4408ALR.pdf

    They're current, and JBL Pro's least expensive titanium tweeter.

    The Tang Band 28-847SD I'm using in AR4x is 2.875" diameter, and would be a significant step up from LE20-1, which hardly even qualifies as a tweeter anymore.

    Finally, Fostex does similar with FT207D, which has a flange configured to squeeze in the available space:

    http://www.fostexinternational.com/docs/speaker_comp/pdf/ft207d.pdf

    $41.60 at Madisound:

    http://www.madisound.com/catalog/index.php?manufacturers_id=131&sort=3a&filter_id=326

    No crossover changes required if they'll fit.

    I've been wanting to build this with that Fostex tweeter, actually:

    http://www.fostexinternational.com/docs/speaker_comp/pdf/recom_enclose/ft207d_fw137_2way.pdf

    [Using JBL woofers, tho.... :p: ]



    Footnote: Giskard's avatar shows JBL DD66000 "Everest II," JBL's current TOTL flagship speaker, $30,000 per each. A complete home theater setup gets up around $240,000.... :yes:
     
  12. dc270

    dc270 Now Off The Reservation..... Subscriber

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    Thanks Zilch, that Fostex looks very interesting!!
    DC
     
  13. Zilch

    Zilch Curve Junkie Subscriber

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    I've never heard them, but if they sound as good as or better than these Tang Bands, they'll bring your L77s to life.

    The construction seems similar. I'm tempted to order a pair myself, as I may be able to squeeze them into a pair of L44s I have here, a worthy upgrade.... :thmbsp:
     
  14. dc270

    dc270 Now Off The Reservation..... Subscriber

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    I kinda wonder what the impedance looks like at the 2500hz xover point of the 77's capared to what the LE 20's are!
    I appreciate your diligence in finding them-I do like the fit they make between the drivers!
    DC
     
  15. Zilch

    Zilch Curve Junkie Subscriber

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    I'll let you know in about a week.... ;)
     
  16. dc270

    dc270 Now Off The Reservation..... Subscriber

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    Yew da man Zilch- I will anxiously await your valuable information. You getting those Fostex?
    DC
     
  17. Zilch

    Zilch Curve Junkie Subscriber

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    Yeah, talked myself into trying a pair right here on AK last night.

    [It's a hazard of "researching" stuff.... :p: ]
     
  18. Steve O

    Steve O Super Member

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    I've done a little research too based on what I've read in this thread. After some catalog surfing last nite, I almost understand how you arrived at your decision to recommend the Fostex FT207D and TB 28-847 (S?, SA?, SD?) as a repl for the LE20. Is it the combination of true extended HF response combined with low fs/low end response and high sensitivity? If this is so, is there some reason similarly spec'd HF drivers from say Morel wouldn't work too such as MDT-20 or esp MDT-37. Both appear to have the low end capabilities at least by spec sheet and the MDT-37 is 3dB more sensitive (room to play with level matching, minor eq etc.).

    Curious minds want to know how the pros think.
     
  19. dc270

    dc270 Now Off The Reservation..... Subscriber

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    Another thing to consider is the xover point and what the ohms of the driver is at that point so it will crossover effectively/ smoothly. I think the Morels, which I dearly love, are maybe close to 6 ohm around 2K (the Lancers xover point), I dont know what the LE 20 (in the Lancers) ohm is at that point but the xover components should be built to consider that and more.
    DC
     
  20. Steve O

    Steve O Super Member

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    Yes, this is a detail but an important one as I found out working on my Altec Carmels.

    FWIW all HF drivers discussed so far are catalog rated at 8 ohms nominal although the Morels RE is 5.2 ohm, the TB is 6 ohm and the Fostex was not noted in the Madisound catalog. The LE20-1s I have laying around have RE ~ 3.5 ohm regardless of whether stated nominal imp is 8 or 16 ohm !!!???:scratch2: so I suspect that Z2k wil be less than 8 ohm. Guess I'll meas tonite to be certain.

    This discovery further has me wondering how Mr. Z makes his selections (and apparently makes 'em work correctly in his chosen app).
     

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