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    Thanks for your input! I managed to find the...

    Thanks for your input! I managed to find the schematic for the M553 and indeed it seems that you can replace a number of caps with a lower value - it's already done in the mono leg. Maybe IŽll...
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    JBL electronic crossover mod

    Hi all, I recently acquired a JBL M553 electronic crossover which can be configured for stereo with three passbands. I then looked at the specs and found that the crossover frequency for the treble...
  3. And... here is the credit to user qcieri who...

    And... here is the credit to user qcieri who posted this on 12-22-2022. This is the link to his collection of JBL files:[url]http://www.cieri.net/Documenti/JBL/D.../FileList.html
  4. Something went wrong....

    Something went wrong. Again:http://www.cieri.net/Documenti/JBL/Documenti%20tecnici/JBL%20-%20Transducer%20Replacement%20List%20(1984).pdf
  5. Hi again, I stumbled across another list which...

    Hi again, I stumbled across another list which can make it even clearer for those who seek replacement for obsolete drivers. This comes from one of the regulars on this site, sorry forgot just now...
  6. Thanks men, I knew you would help me. From the...

    Thanks men, I knew you would help me. From the lists I can see that neither the LF driver in my L212Žs nor the cone kit is available anymore. One of the LF drivers is reconed and it sounds and...
  7. Hi all.The list presented here was almost the one...

    Hi all.The list presented here was almost the one I've been looking for... no actually shouldn't there be a list of old vs new driver names, like LE15A-2215 etc? I'm sure I've seen it here somewhere...
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    Hi again. Thank you Widget, maybe it doesn't get...

    Hi again.
    Thank you Widget, maybe it doesn't get better than this with a passband variation of around 5 dB. I compared my latest curve to the one Earl K showed in one of his answers and it seems we...
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    Hi. I admit the graphs from yesterday didn't look...

    Hi. I admit the graphs from yesterday didn't look too good. Here is one with calibrated levels and correct frequency span and also with 5th harmonic distortion. /P
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    Hi all helpful people, I just want to share some...

    Hi all helpful people,
    I just want to share some graphs from the latest measurement on my 2440+HL14-50 combo. The unit is now out of the cabinet and resting on a table. Measuring distance 27". Sorry...
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    Thanks Earl K, that is potentially very...

    Thanks Earl K, that is potentially very interesting. IŽll try to emulate your measurements - were they done at 1 metre distance? I had a look at the test measurement I did when trying to understand...
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    Thank you Widget for passing on this information!...

    Thank you Widget for passing on this information! I have read it with great interest and will try some of the tricks used for measuring the frequency response. I'm not too concerned by the ragged...
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    Hi again. It took a while to sort out the REW...

    Hi again. It took a while to sort out the REW software but now it seems I have a grasp of the functionality. After some calibration I ran a curve of the 2440 through my electronic crossover...
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    Hi again. Sadly I don't have a 2" horn available...

    Hi again.
    Sadly I don't have a 2" horn available right now. I can guess that neither the H93 nor the Selenium are perfect, and as soon as I can IŽll buy - yes, what? Would a horn like the 2380 fit?...
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    Hi again. I got the driver and horn out of the...

    Hi again.
    I got the driver and horn out of the cabinet today and I opened it up for inspection. The gap was clean and after replacing the diaphragm I ran a frequency sweep which was OK. There is no...
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    Yes absolutely. The 2440:s sit in Olympus...

    Yes absolutely. The 2440:s sit in Olympus cabinets in my living room. They are not easily moved about. I measured at one meter distance from the midrange horn without the grille. The 2440:s are a...
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    Hi again, IŽll try to wrench the monster out of...

    Hi again,
    IŽll try to wrench the monster out of its box this weekend and have a go at the alignment and the shims issue. Radian said that the shim is mostly used by those who need a greater...
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    Thanks Edgewound and Earl K for your responses....

    Thanks Edgewound and Earl K for your responses. IŽll try to explain better:

    The new diaphragms came with shims. I contacted Robert at Radian who said that if the old diaphragms didnŽt have any...
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    Uneven response on 2440 with new diaphragm

    Hi all,

    recently I fitted new Radian 1245 diaphragms to my old 2440 drivers. The old diaphragms were battered and worn so I expected a change for the better. Well I can't say the new ones have...
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    Impressive grilles

    Wow! IŽm impressed with your work however you did it. Some stories around these grilles:

    The grille pattern can be found in Japan, where you have the old trade of manufacturing wooden grilles in...
  21. Thread: 2213 issues

    by Pellets
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    Hi Kay, yes, the dust cap was knocked in during...

    Hi Kay,
    yes, the dust cap was knocked in during a serious monitoring session I guess. I managed to get the worst bits out through the vent hole and also sealed the cracks with some carpenterŽs glue....
  22. Thread: 2213 issues

    by Pellets
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    Dear RMC, thanks for your info! I will get to it...

    Dear RMC,
    thanks for your info! I will get to it as soon as I can get a quiet moment for myself... I agree that no more than a beer or so may be consumed during this precious work.
    I'm a bit...
  23. Thread: 2213 issues

    by Pellets
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    Many thanks to you all for advice and information...

    Many thanks to you all for advice and information concerning my dusty 4312:s. I decided to go for the easy but somewhat tedious task first, removing dust and hair with tweezers, a toothbrush and some...
  24. Thread: 2213 issues

    by Pellets
    Replies
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    2213 issues

    Dear all:

    I purchased a well used pair of 4312A:s the other day. This is the utility black version. I finally managed to carry them to the car and home and found that the previous owner had a cat....
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    OK, so I have now the two sets of drawings (C51...

    OK, so I have now the two sets of drawings (C51 and C56) ready to send to you. Can you please send me your address and IŽll try to send the drawings asap. Cost lower than expected, all in all 50 USD....
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