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Thread: Midrange JBL 2202H and 2123H

  1. #1
    Senior Member Niklas Nord's Avatar
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    Midrange JBL 2202H and 2123H

    Wanting low distortion and clear hifi -purpose sound from
    an JBL 2202H, what would be the best dividing frequency ?

    Between 220 to 300hz ? and up to 800hz ?

    And recommended box size for that application, sealed enclousure

    --

    Wanting low distortion and clear hifi -purpose sound from
    an JBL 2123H, what would be the best dividing frequency ?

    Between 600 to 800hz ? and up to 2200hz ?

    And recommended box size for that application, sealed enclousure

    ....-
    Best Regards
    .Niklas Nord, Stockholm Sweden
    Proud owner of the Project K2 s9500 system

  2. #2
    Senior Member Niklas Nord's Avatar
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    i know some of you want to say to me, that the 2123H
    can be used, and only that one, from 280 to 2200, BUT
    i like the lower midrange from the 2202 mouch better
    than the 2123.

    i really would like to try this out, and run both of them
    in my mainspeakers.

    i´m dividing to a ribbon next...

    i´m more pleased with the 2123 over 800hz than the 2202,
    so I really would like to use them in the same system.
    Best Regards
    .Niklas Nord, Stockholm Sweden
    Proud owner of the Project K2 s9500 system

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    Administrator Mr. Widget's Avatar
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    "i know some of you want to say to me, that the 2123H can be used, and only that one, from 280 to 2200, BUT i like the lower midrange from the 2202 mouch better than the 2123."

    You are right! I really can't recommend using both of these in one system.

    What woofer are you using? If you use say a 2234H or 2235H you can take it up to 500Hz or 800Hz and eliminate the need for the 2202H.

    In answer to your question though, JBL uses the 2202H in a 1.7 cu ft sealed box above 290Hz.

  4. #4
    Senior Member Niklas Nord's Avatar
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    yes i know you would say that. haha,
    BUT, i have to many drivers laying on my floor...

    well well...

    Best Regards
    .Niklas Nord, Stockholm Sweden
    Proud owner of the Project K2 s9500 system

  5. #5
    Administrator Mr. Widget's Avatar
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    I keep my extra drivers in nice rows on shelves in the garage.

  6. #6
    Senior Member Niklas Nord's Avatar
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    hehe!

    right now there are

    4 2202
    4 2123
    3 empty 2225 baskets (recone to 2234 or 2235)
    1 2225

    ...on the floor
    Best Regards
    .Niklas Nord, Stockholm Sweden
    Proud owner of the Project K2 s9500 system

  7. #7
    Senior Member Niklas Nord's Avatar
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    1.7 cu feet, thats 48 liters, quiet some volume, pretty many liters...
    Best Regards
    .Niklas Nord, Stockholm Sweden
    Proud owner of the Project K2 s9500 system

  8. #8
    Administrator Mr. Widget's Avatar
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    As I recall you want to use a ribbon above 2200Hz.

    I would recone all 4 2225s to either 2234 or 2235 (my choice would be the 2235) put all four in separate cabinets tuned to 28-29Hz. Set it up kind of like the 4435 with the one 2123 directly over the woofer. Filter the out board woofer. Start with an 18mH coil ala 4435, you may want more or less mid band. Then biamp with a variable freq. crossover and experiment to see which frequency works best for you. You may like the 2123 at 300, 400, 500, ... as you will be getting support from the dual woofers you will need to play around.

    Finally mount the tweeter directly over the mid and there you go. I would expect it would give you a very good system.

    Continue to store or sell the extra bits.

  9. #9
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    I have no idea what the DCR of the 2.6mH inductor on the primary 2234H in the 4435 is, nor do I know what the DCR of the 18.0 mH inductor on the secondary 2234H is. That information would be nice to know. Usually the DCR is in the 0.5 to 0.6 ohm range but I wonder about that 18.0 mH. It would be nice to design your system so there aren't any inductors in the LF at all.

    Mr. Widget, how do you have your dual 2235H's set up again? He may want to simply pattern that.

  10. #10
    Administrator Mr. Widget's Avatar
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    Nothing fancy, JBL recommended pair of separate 5 cu ft boxes tuned to 29Hz. (a pair of 4" dia 11" long ports per box).

    BTW They rock!

  11. #11
    Your Memory Lives On RIP Tom Loizeaux's Avatar
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    Originally posted by Mr. Widget
    I keep my extra drivers in nice rows on shelves in the garage.
    I hope you keep those cone drivers up on end, the way there are when mounted in a cabinet. If you lay them down, either cone up or cone down, you risk having the cone weight pull the spyder and surround out of normal centered position. Sometimes this offset becomes permanant, killing the ability of the speaker to deliver linear cone travel.

    Tom

  12. #12
    Administrator Mr. Widget's Avatar
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    Actually I hadn't thought about it but I suppose flipping them over annually is probably not a bad idea.

    As far as keeping them on end goes, I have seen older woofers in cabinets that were always in the same orientation and they definitely sag.

  13. #13
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    "1.7 cu feet, thats 48 liters, quiet some volume, pretty many liters..."

    Yes, true, at that size the enclosure is approaching an infinite baffle rather than an acoustic suspension. Basically it is acting to shield the 2202 from the LF chamber as opposed to providing any significant damping.

    "If you lay them down, either cone up or cone down, you risk having the cone weight pull the spyder and surround out of normal centered position. Sometimes this offset becomes permanant, killing the ability of the speaker to deliver linear cone travel."

    "Actually I hadn't thought about it but I suppose flipping them over annually is probably not a bad idea."

    Yeah..... JBL just rediscovered that the hard way.....

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