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Thread: JBL 5235 crossover cards !

  1. #1
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    JBL 5235 crossover cards !

    Hello! How easy is to modify the 5235 crossover cards from CCBREQ to FFBREQ ? Best regards!

  2. #2
    Dang. Amateur speakerdave's Avatar
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    If you have the CC cards all you need to do is correlate the information in the 5235 manual Tables 4 and 5 with Specifications sections 5-1 and 5-2 and change the loads accordingly. Google will turn up the manual.
    "Audio is filled with dangerous amateurs." --- Tim de Paravicini

  3. #3
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    Some information to help you in your card conversion:

    xxBREQ cards are the followings:

    51-5232 - 500 Hz/18 dB/octave CCBREQ
    51-5233 - 800 Hz/18 dB/octave CCBREQ
    51-5332 - 500 Hz/18 dB/octave FFBREQ
    51-5333 - 800 Hz/18 dB/octave FFBREQ
    51-5334 - 1200 Hz/18 dB/octave FFBREQ
    51-5336 - 1600 Hz/18 dB/octave FFBREQ

    52-5222 - 500 Hz/12 dB/octave CCBREQ (Card in picture hereafter)
    52-5223 - 800 Hz/12 dB/octave CCBREQ
    52-5322 - 500 Hz/12 dB/octave FFBREQ
    52-5323 - 800 Hz/12 dB/octave FFBREQ





    R108 and R109 as well as AOPs are on the main board, not on the filter card.

    Components values for 18dB/oct cards::


    For checking the response (FFBREQ cards first graph, CCBREQ second graph:





    Components values for 12dB/oct cards (in red estimated values, if someone has these boards please confirm or correct the values):


    For checking the response (FFBREQ cards first graph, CCBREQ second graph:



  4. #4
    Administrator Robh3606's Avatar
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    Great info mind if I drop it in the Tech Section so it doesn't get lost!

    Rob
    "I could be arguing in my spare time"

  5. #5
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    Quote Originally Posted by Robh3606 View Post
    Great info mind if I drop it in the Tech Section so it doesn't get lost!

    Rob

    Dear Rob,

    Thanks.
    I still have the plan to translate what I did here in the past: https://www.jbl-vintage.com/t3066-fi...-jbl-urei-5235 , that could be added later.
    I have also a pair of 24dB/oct (with EQ and delay) 53-5333 cards that should be described and measured in addition to the already available material.

    Red components values are expectations, and this shall be signaled.

  6. #6
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    Huge help! Thank you all!

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