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Thread: Frankenspeaker?

  1. #1
    Senior Member bigstereo's Avatar
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    Frankenspeaker?

    Some of you all may think this is a dumb question but here it is any ways.

    What if one were to take all the components from a pair L100 Century or 4311 and put them into a bigger cabs, say 5 cu ft, non ported? Or if it would be better, ported.

  2. #2
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    It would be interesting. The D123 that the woofer is based on was designed for a smaller cabinet, but smaller probably ment at least as large as your speaking of. It was designed with base reflex in mind but by that they ment a decent sized hole or a hole with a shelf on the edge that is toward the woofer.However,that was before they plastered it all up and out an accordion surround on it which is a pretty major mod. I've been going to try somthing like that some day but I haven't even gotten around to procrastinating yet.

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    RIP 2011 Zilch's Avatar
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    http://audioheritage.org/vbulletin/s...561#post123561

    I'm now thinking 104H-2 for the midrange rather than fighting LE-5 with the crossover.

    It's a "closed-box" woofer. EBP = 48

    That makes a closed-box L100t3

    http://manuals.harman.com/JBL/HOM/Te...100t3%20ts.pdf

    Who's got T/S parameters for 123A-1?

    BB6P has different than what JBL has published for the 2213s

    Edge says 123A-1 is 2212, which is not in the database.

    I THINK the forum has been through this before, but I am unable to find it.... :dont-know
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    Administrator Robh3606's Avatar
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    It sounds just like the Alpha JBL did but they used a pasive radiator and the Le-20 so it was closer to the 4310 look here:

    http://www.lansingheritage.org/image...ome/page10.jpg

    Actually has some promise as your woofers do better in a larger box. Have fun!!

    Rob

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    Senior Member spkrman57's Avatar
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    JBL Pro for home use!

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    RIP 2011 Zilch's Avatar
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    Thanks, Ron.

    Your Vas translates to 212.4 L, i.e., closer to the 124A spec.

    Guess I'll hafta rip the insulation out of an L88 and measure a bunch here.

    Getting the Vas right is critical to deciding on a box design....

    WinISD shows 123A parameters for the 2213s.

  7. #7
    Administrator Robh3606's Avatar
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    WinISD shows 123A parameters for the 2213s
    Hello Zilch

    It should?? They are the same Huh!!! Learn something new every day check out the Tech Sheet for the L88 Plus and the driver interchangability.

    http://manuals.harman.com/JBL/HOM/Te...0Plus%20ts.pdf

    Look at this old Pro Note publication. Look at the recomended box.

    I have 4 123A-1's Two came out of my L88's and 2 are Ebayed


    Rob
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    RIP 2011 Zilch's Avatar
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    Thanks, Rob!

    Edge says 2213 is 123A-3, 2212 is 123A-1

    There's no tech sheet for 4310, apparently.

    We now have an argument for 4311 being "better" than L100!!

    BB6P returns inordinately large boxes for vented alignments.

    But nice-sized ones for closed box, which I'm positing is preferred.

    Thinking "Baron," for example, 3 cuft.

    If I was building (the subject of this thread,) I'd go right for L100t/t3 (they're different) dimensions, ~3.3 cuft., and driver layout.

  9. #9
    Administrator Robh3606's Avatar
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    Hello Zilch

    Yes I was thinking along the same lines just keep the box sealed and not use the PR. He can always adjust the box size as required. If he already has the drivers here's the Tech Sheet for the Alpha:

    http://manuals.harman.com/JBL/HOM/Te...20III%20ts.pdf

    Rob

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    Senior Member bigstereo's Avatar
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    I was thinking of using a Bozak 302a French Provincial cab, if I don't like the sound of the Bozaks in them.

  11. #11
    RIP 2011 Zilch's Avatar
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    Assuming 5.0 cuft., and employing 124A parameters, it's too large for closed-box alignment. You run out of cone excursion at a relatively high frequency (35.11 Hz, top, red).

    Tuning to 26 Hz with 1 x 4" x 6.44" long port, you're good to 20.54 Hz (-10 dB, bottom, black), where it's also displacement limited. It'll retain L100's boomy bass, but play lower. Use an infrasonic (highpass, aka subsonic, aka rumble) filter at 20 Hz to protect the drivers:
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    Senior Member spkrman57's Avatar
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    123A-1's in 3 cubic ft sealed!

    Sounds like something I want to try in the near future.

    Great thread, there's some info I can use here!

    Just have to pick the mid/tweets and crossover to go with it.

    Thanks, Ron
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  13. #13
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by spkrman57
    Sounds like something I want to try in the near future.
    Yup, they worked in the closed-port L88s pretty good, so I'm gonna drag some Barons up from the dungeon to try. You can bet I'll jump on the next "distressed" L100t/t3 I encounter, too.

    Quote Originally Posted by spkrman57
    Just have to pick the mid/tweets and crossover to go with it.
    Easy. 2452H-SL on PT waveguide, NL200t3.

    O.K., O.K., BMS 4552nd on the JBL $10 waveguide, then, 3120A to start....

  14. #14
    RIP 2011 Zilch's Avatar
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    Viscounts, instead. Better for stacking horns on top.

    Gotta make baffle adapters; these are cut for a single 15".

    Alas, no stilettos, but these inverted obelisks aren't bad looking in person.

    [If they work, they'll look even better in JBL Monitor Blue.... ]
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  15. #15
    Administrator Robh3606's Avatar
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    Hello Zilch

    Sure you have enough speakers there??

    Rob

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