JBL 5235 crossover cards !

[retro soulman]

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

[speakerdave]

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.

[dn92]

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

https://i.servimg.com/u/f38/18/83/38/22/jbl_5217.jpg

https://i.servimg.com/u/f38/18/83/38/22/jbl_5x10.jpg

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

Components values for 18dB/oct cards::
https://i.servimg.com/u/f38/18/83/38/22/51-5xx11.jpg

For checking the response (FFBREQ cards first graph, CCBREQ second graph:
https://i.servimg.com/u/f38/18/83/38/22/51-53x10.jpg

https://i.servimg.com/u/f38/18/83/38/22/51-51x10.jpg


Components values for 12dB/oct cards (in red estimated values, if someone has these boards please confirm or correct the values):
https://i.servimg.com/u/f38/18/83/38/22/cartes10.jpg

For checking the response (FFBREQ cards first graph, CCBREQ second graph:
https://i.servimg.com/u/f38/18/83/38/22/52-52x10.jpg

https://i.servimg.com/u/f38/18/83/38/22/52-5xx11.jpg

[Robh3606]

Great info mind if I drop it in the Tech Section so it doesn't get lost!

Rob:)

[dn92]

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-filtre-actif-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.

[retro soulman]

Huge help! Thank you all!