Results 1 to 6 of 6

Thread: Please advice for JBL Crossover

  1. #1
    Junior Member
    Join Date
    Jul 2011
    Location
    Vietnam
    Posts
    2

    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
Views: 11505
Size:  122.6 KB

    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
    Moderator hjames's Avatar
    Join Date
    Nov 2005
    Location
    NoVA - DC 'burbs
    Posts
    8,547
    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: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

  3. #3
    Senior Member ratitifb's Avatar
    Join Date
    Feb 2006
    Location
    France
    Posts
    653
    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
    Junior Member
    Join Date
    Jul 2011
    Location
    Vietnam
    Posts
    2
    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
    Join Date
    Feb 2006
    Location
    France
    Posts
    653
    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
    Moderator hjames's Avatar
    Join Date
    Nov 2005
    Location
    NoVA - DC 'burbs
    Posts
    8,547
    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: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Restoring JBL L-65 Crossover Advice?
    By TurbineShake in forum Lansing Product Technical Help
    Replies: 7
    Last Post: 01-14-2009, 07:47 PM
  2. need jbl crossover advice!!!!!!!!
    By armsfreeman in forum Lansing Product DIY Forum
    Replies: 3
    Last Post: 06-13-2006, 12:41 AM
  3. Need Crossover advice
    By LE15-Thumper in forum Lansing Product Technical Help
    Replies: 20
    Last Post: 02-23-2006, 08:05 PM
  4. active crossover advice
    By Jakob in forum Electronic Crossovers
    Replies: 4
    Last Post: 01-18-2006, 09:02 PM
  5. New guy needs 3105 crossover advice, perhaps more!
    By sdaniel in forum Lansing Product Technical Help
    Replies: 6
    Last Post: 12-15-2005, 02:28 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •