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  1. Replies
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    Input impedance variation is compensated by the...

    Input impedance variation is compensated by the resistor placed in parallel to the autotransformer input. With the apropriate resistor value, circuit input impedance will be the one of the resistor....
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    There are nice autotransformers from Germany ;-)...

    There are nice autotransformers from Germany ;-) on eBay.
    I'll try to find the link. I had the opportunity to measure two of them, and they work well. You can use them directly with Compression...
  3. Can someone at least confirm that the correct...

    Can someone at least confirm that the correct board reference for Paragon is M20?
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    Fostex r100 are autotransformer which is...

    Fostex r100 are autotransformer which is different from usual Lpads. Noble RPH25 is not available anymore, only on second hand market.
    ...
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    Otherwise you can search for Noble RPH25 (model...

    Otherwise you can search for Noble RPH25 (model used by TAD and Rey Audio) some of them used by Yamaha are 16ohm while the majority of them on second hand market are 8ohm.
    Iíve two of them in stock...
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    8ohm when connected in parallel as in the...

    8ohm when connected in parallel as in the provided schematic. Each pad of the r82b is 16ohm.
    Iíve a pair of them and measured this some time ago. You can go ahead with them.
  7. JBL SE408S crossover/equalizer board for Paragon DD44000

    I'm searching for the technical information about the equalizer board for JBL SE408S amplifier, to drive JBL Paragon with active crossover. It seems that the reference for the board is M20, but I’m...
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    take the r82b, it is a dual 16 ohm, just use one...

    take the r82b, it is a dual 16 ohm, just use one of the channels
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    Equalizer boards schematic for Active crossover of Paragon using SE408S

    I'm also searching the schematic of those equalizer boards. The reference seems to be M20. If anyone has the schematic or even boards available Iwould be interested.
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    Hou can use Soniroll fiberglass, same as the one...

    Hou can use Soniroll fiberglass, same as the one pos used that has similar density as the one used by JBL.
    I got it from Point P shop where you can order it.
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    Appart that after March 29th shipping cost to you...

    Appart that after March 29th shipping cost to you won’t be the same...

    There is also a good address in France that could be able also to do the replacement, with no Customs fees for shipping...
  12. Thread: Calculating vents

    by dn92
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    Corrected, I wrote this without checking first. I...

    Corrected, I wrote this without checking first. I added the link to the document.
  13. Thread: Calculating vents

    by dn92
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    I've tubes of 105mm diameter on my TAD 2402...

    I've tubes of 105mm diameter on my TAD 2402 clones, instead of 100mm accordingly to the plans. I've clone of exact dimensions for all the rest, especially the interna volume, and I used glasswool for...
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    Values are here:...

    Values are here: http://www.jbl-vintage.com/t3066p25-filtre-actif-jbl-urei-5235In the 12dB XXBREQ table values in red were calculated and could be different in real cards.
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    It was JBL UREI 5233 that was made for that, a...

    It was JBL UREI 5233 that was made for that, a kind of 5234 with half of the electronic
    https://i.servimg.com/u/f38/18/83/38/22/523310.jpg

    You can use two 5234, 5234A or 5235 populated with only...
  16. Thread: bi amp help

    by dn92
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    52-5140 - For JBL 4340, 4343 et 4350 12dB with...

    52-5140 - For JBL 4340, 4343 et 4350
    12dB with frequencies a bit more than 250Hz, ButterworthIf you don't succeed in getting a 5140 use the 250Hz card or any 12dB/oct 250Hz active crossover...
  17. Thread: DMS-1 EQ settings

    by dn92
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    High Shelf 12dB I think, but 10dB is a high...

    High Shelf 12dB I think, but 10dB is a high value, but aquaplast mades the diaphragm heavier, and then more horn roll of compensation is needed. Just set it up'and do a measurement to see if it is...
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    To continue help about from French guys :)...

    To continue help about from French guys :) hereafter is a vintage approach (whereas I own and use DSPs):

    In my old thread in a French forum about JBL UREI 5235, I proposed an alternative to DX-1...
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    The 2231 have also been refoamed by an amateur....

    The 2231 have also been refoamed by an amateur.
    as Ian is writing there are also nice clones with checked and renewed components. I know two sources in EU, Behringer Electric already mentionned but...
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    JBL 2450J on 2380A, 1m on axis measurement file:...

    JBL 2450J on 2380A, 1m on axis measurement file: 81898


    Phase correspond to impulse response shift to 0, which means that if using it as it is it will not reflect the delay between 2445 and...
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    JBL 2450J on JBL 2380A impedance file

    81893

    Remove ".txt" in the file name.
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    JBL 2404H impedance and on axis response

    81891
    81892

    Remove ".txt" in the file name.
    Response mesurement was done at 1m distance, on axis. Sound transmission delay removed (Phase aligned to minimal phase), some gating to get a clean...
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    I have impedance measurements for 2450J/2380A and...

    I have impedance measurements for 2450J/2380A and 2404H, this would ease crossover simulation. Just need the time to find them and be back home to share them.
    I've also on axis response but without...
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    It looks exactly as a not well centered JBL...

    It looks exactly as a not well centered JBL diaphragm. On the measurements you should also see distorsion in the problematic frequency area.

    My experience in changing 2" JBL diaphragms (I...
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    this was the 53-5333 crossover board, working...

    this was the 53-5333 crossover board, working only in 5235 as the board needs power supply. It was passible to modify the crossover frequency by changing a resistor network component, and the same...
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