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  1. #1
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    Please advice for JBL Crossover

    Hi everyone

    I am doing my 2 way project with JBL 2235H (8Omh) and LE85 (8Omh) with horn H91. I have just finished building a 5cf vented box for 2235H. The LE85 with horn is put on top of the 2235H box. I am now having a headache for the crossover because I am not good at technical things.

    I am looking at the crossover calculator and check up the 2nd order Butterworth crossover at 800Hz which show below:

    Capacitors
    C1 = 17.58 uF
    C2 = 17.58 uF
    Inductors
    L1 = 2.25 mH
    L2 = 2.25 mH

    I am also wondering should I use the above calculator for my speakers or I can follow the design of L200B crossover network but it use LE85 16Ohm. I am not sure if that network can be used with my LE85 8Ohm?

    Name:  l200b ts.jpg
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    Could you please help me which one I should follow or if you have any other better ideas would be highly appreciated.

    Thanks.

  2. #2
    Heather [Senorita member] hjames's Avatar
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    Don't know if it will help, but it may be a newer better approach.

    I built some 3 way systems based on the L200 cabinet, 2235 woofer LE85 horn and added the 2405 slot .. basically equivalent to the 4333 3 way system, tho with the shorter length horn ...

    I used the crossover member "4313" had designed and shared with the forum ...

    http://www.audioheritage.org/vbullet...1&d=1257099850

    Perhaps you could use the Bass and Mid legs (the upper 2 legs) of this design? Its well marked.

    2ch - Oppo DV981, JoLida 502, JBL L200+, KEF 105.4
    HT7- Oppo BDP-93, B&K amps, Vandy 2Ce, 2Ci, VCC1, DCM TF600 & 4641

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    Senior Member ratitifb's Avatar
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    Quote Originally Posted by hjames View Post
    Perhaps you could use the Bass and Mid legs (the upper 2 legs) of this design?


    because the LE85 is lowpass filtered in its upper frequency range and without the lower leg + 2405 you'll loose all HF/UHF in the upper frequency range of the LE85 + horn response ...

    Quote Originally Posted by tattoo View Post
    I am not sure if that network can be used with my LE85 8Ohm?
    don't worry about 8 or 16ohms, in both cases LE85 have the same diaphragm & voice coil

  4. #4
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    Quote Originally Posted by ratitifb View Post

    don't worry about 8 or 16ohms, in both cases LE85 have the same diaphragm & voice coil
    Thanks Ratitifb very much. So it means I can use the L200B design network with the LE85 8Ohm without any problem.


    @hjames: I will keep your design network for my next project when I add a tweeter in the system.

    I have one more question. I know that the L200B network has a high frequency boost which is C1uF + L0.16mH + R5Ohm. Could you please explain for me what does it use for? Can I omit that boost out of the network? Or if it is better to keep the boost then I will keep it.

  5. #5
    Senior Member ratitifb's Avatar
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    Quote Originally Posted by tattoo View Post
    Can I omit that boost out of the network? Or if it is better to keep the boost then I will keep it.
    if you add the 2405 it would be better to omit this HF boost and to go to the 4333/L300 Xover designs (3133/N333 shematics). In any case adjust them till they sound good

    Take a look on the Zilch's #2 post at http://www.audioheritage.org/vbulletin/showthread.php?20083-L200-DIY-Upgrade

  6. #6
    Heather [Senorita member] hjames's Avatar
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    I understand - but I think you'd find it worthwhile to go directly to the 3-way design ...
    Just my opinion, of course, but having started with a original 4320 that I moved into the nicer looking L200 cabinet and then upped into a 3-way design ... start as a 3 way.


    Quote Originally Posted by tattoo View Post
    Thanks Ratitifb very much. So it means I can use the L200B design network with the LE85 8Ohm without any problem.


    @hjames: I will keep your design network for my next project when I add a tweeter in the system.

    I have one more question. I know that the L200B network has a high frequency boost which is C1uF + L0.16mH + R5Ohm. Could you please explain for me what does it use for? Can I omit that boost out of the network? Or if it is better to keep the boost then I will keep it.
    2ch - Oppo DV981, JoLida 502, JBL L200+, KEF 105.4
    HT7- Oppo BDP-93, B&K amps, Vandy 2Ce, 2Ci, VCC1, DCM TF600 & 4641

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