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  1. Replies
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    You guessed it! Great source of info/advice. Need...

    You guessed it! Great source of info/advice. Need to get over there for a visit/update. But he's really busy.
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    Local JBL pro Jeff has used this driver combo for...

    Local JBL pro Jeff has used this driver combo for years crossing @ 5k Hz as you suggest. Says it's one of his favorite vintage combos!
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    The "potentiometer" type in JBL speakers are...

    The "potentiometer" type in JBL speakers are actually "L pads." The L indicating two arms of the circuit, one series and one parallel. This, theoretically, provides a constant resistance load across...
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    Agree. Hard to believe JBL discontinued the 2441....

    Agree. Hard to believe JBL discontinued the 2441. I was making a general comment, sorry to mislead, offend. Mike
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    When I was in the process of changing my old...

    When I was in the process of changing my old (1979) 375 dia to 2441 a couple years go, being a product development technician in engineering, I was . . . surprised to see how crude the machining was...
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    Hi Kay - I've done it 3 or 4 times using an...

    Hi Kay - I've done it 3 or 4 times using an exacto knife (new). Steady hand, very touchy. You've got to get down as close to the voice coil as possible without causing damage. Stuff tends to fall...
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    +1 Bottom line: THERE JUST ARE NO PARTS!...

    +1
    Bottom line: THERE JUST ARE NO PARTS! Recently researched the aftermarket offerings for LE15 and the basic R is not even correct. Would have to re-tweak the crossover, etc. Loosing battle.
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    I'd say install what ever sounds best, regardless...

    I'd say install what ever sounds best, regardless of the impedance stamped on the back. Back when those were designed - the age of tubes - the 16 ohm had some design advantages, I seem to recall....
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    And, so much depends on the quality /...

    And, so much depends on the quality / characteristics of any given environment. Yeow. One walk around a room with a pink-noise / RTA mic is a real eye opener. Help! Not sure installing these big...
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    15 watt / 1" length. (Mono, 8 ohm). I've also had...

    15 watt / 1" length. (Mono, 8 ohm). I've also had good luck prying open the tin covers and applying Deoxit liquid directly to the wipers (brush, wipe clean).
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    Those are VERY simple crossovers. Guesstimate is...

    Those are VERY simple crossovers. Guesstimate is that the L-pads are corroded (ten years in storage will do that) and need cleaned/replaced. Other than that, as I recall, there are only three caps to...
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    You might enjoy the old Cohen text from the '60s....

    You might enjoy the old Cohen text from the '60s. It's got all the basics in terms of math, schematics, charts that explain how this stuff actually works. All the old vintage systems of the day as...
  13. +1. Replaced old 375 (original) diaphragms a year...

    +1. Replaced old 375 (original) diaphragms a year or so ago with 2441. Excellent - would never really consider anything else.
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    I love 'em. Have done two and three-ways along...

    I love 'em. Have done two and three-ways along those lines with different horns but never got around to trying the radial horn. That extra L-pad is key and a necessity in my experience. Have you...
  15. There is a reason folks like Greg Timbers get...

    There is a reason folks like Greg Timbers get degrees in both electronics AND acoustics.
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    Yes to all the above. My experience, for what it...

    Yes to all the above. My experience, for what it is worth, is to build a "4333" enclosure for the bass drivers and then experiment with (endless) treble ideas above. It puts everything in a...
  17. Here are two quick ideas; things that would make...

    Here are two quick ideas; things that would make a real improvement:

    1) Bi-amp. Not necessarily the digital whiz-bang (unless you are a computer nerd), perhaps an Ashley or the old Luxman...
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    Hi Baron! Did that job on a 4312 - same diff, as...

    Hi Baron! Did that job on a 4312 - same diff, as I recall. Yes, there are screws under the foilcal. Just use a hair dryer and razor blade scraper. Just get an edge loose and then gently pull/lift it...
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    +1!

    +1!
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    The lenses definitely affect the character of...

    The lenses definitely affect the character of sound on those horns, neither good nor bad - a trade-off. I generally prefer the Selenium 14-50 . . . but they aren't "perfect" either. It's all an...
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    +1.

    +1.
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    Hi Ed. Pending Rpower hands-on data, my research...

    Hi Ed. Pending Rpower hands-on data, my research above indicated the thing has a "smart fan" and is very quiet in normal use. A few reported "inaudible." When driven hard for extended periods - pro...
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    Amazing value. My research indicates everyone...

    Amazing value. My research indicates everyone seems to love this whole series from the 800 thru 3500. Data sez distortion is superior to the old "D" series favs. Minimum "bells and whistles" so they...
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    Yes, there were "a" versions of several of these...

    Yes, there were "a" versions of several of these which added the treble boost feature. In any case, there should be decal on the side of the unit. I have a number of these - 3110, 3120 - and they...
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    Ah-hah - now I get it! I'm a museum presenter so...

    Ah-hah - now I get it! I'm a museum presenter so I know where you are coming from. We have the original Jim Clark Indy racer and spent months just getting the decals right. It's a real challenge and...
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