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  1. Replies
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    It seems the old service manuals website does not...

    It seems the old service manuals website does not exist anymore. It's sad.
    I'm looking for the schematic of the 3152 network (or crossover).
    Can anyone help ? where can the various crossover...
  2. Replies
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    503,491

    Sticky: Dana, Before you sell that...

    Dana,

    Before you sell that "Earthquake"/sensurround-meant subwoofer, would you mind taking and posting a few pics showing this prototype (ideally the pics should also allow to understand the inner...
  3. 2123 any good down to 100hz ?

    Has anyone experience with using these over-engined and high Fs 10" drivers in satellites down to 100 hz ?

    JBL has done this on the little 2 way box 4716A if I get it right. My idea is to then add...
  4. UP (still looking for 3172 Xover schematic)

    UP (still looking for 3172 Xover schematic)
  5. Yes, thank you Stephane for the active filtering...

    Yes, thank you Stephane for the active filtering parameters. The 5672 system exists as an active filtered version and - perhaps - more seldom - as a passive filtered version. I'm looking for info on...
  6. I'm still looking for the crossover schematic in...

    I'm still looking for the crossover schematic in order to study it.
    Here is a picture of my system (at least an earlier version of it; the third way up 2khz is now covered by a 2" McCauley 9620 on a...
  7. Replies
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    503,491

    Sticky: OK I come from a country with another social and...

    OK I come from a country with another social and labour culture (which is actually often laughed at). Even if one goes for total labour market flexibility, still people should not be treated like...
  8. Anything newer ? Well, I'm writing from the year...

    Anything newer ?
    Well, I'm writing from the year 2015.

    I have the 2490 on a 2392 horn. 2392/93/94 is the only series of horns that has a 3" entry, maybe some with 2,8" at Community and if you...
  9. Thread: Bart Locanthi

    by Elac310
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    A great engineer. I keep stumbling on his name...

    A great engineer. I keep stumbling on his name when I read RD stuff about JBL, TAD etc. Respect.

    I know the feeling myself, when I travel for business and I'm away from my place, after 3 days I...
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    Digging out an older post/thread, (I love old...

    Digging out an older post/thread, (I love old posts and threads, there's more in those than what has not yet been written in those to come)

    Mr Widget: would you still stand to this impression...
  11. UP (justin case)

    UP (justin case)
  12. It would appear that some smart cookies do manage...

    It would appear that some smart cookies do manage to dismantle their drivers, for instance to mount a bronze throat inside, as here: http://www.youtube.com/watch?v=rE029iX1TU4
  13. Haha. Yes, I know some people around the world...

    Haha. Yes, I know some people around the world manage to make horns and drivers out of all sorts of things...
    And sadly also, some manage to make trash bins and organic fliud receptacles out of all...
  14. Taking apart / dismantling a 2445-type driver: how to proceed ?

    I have one laying around that needs cleaning, removing rust etc. and with which I intend to do some experiments.
    Is it feasible to take it apart (pole plate, core, magnet etc.) and, of course,...
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    These are very nice horns/waveguides and in my...

    These are very nice horns/waveguides and in my experience up to now, an excellent geometry for home-FI use on a 2" driver. I had, similarly, a pair of 2" entry JBL-inspired "butt-cheeks" horn...
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    169,851

    In my 2445 core (5 slit metal core) I have tried...

    In my 2445 core (5 slit metal core) I have tried NOS D16R2445 (original Ti diaph), NOS D16R2441 (aluminium), Non-JBL Be diaphs, and some aftermarket stuff (ribbed Ti). The non-JBL Be had indeed...
  17. Replies
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    The Spanish manufacturer DAS Audio, who also has...

    The Spanish manufacturer DAS Audio, who also has big 2" drivers similar to JBLs 2445 etc. has used these grid protected 4" diaphragms.
    Seraching for images on the net for "DAS audio membranas", one...
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    First, a pair of giant B-stock cinema horns 2392...

    First, a pair of giant B-stock cinema horns 2392 (announced as discontinued), which I had spoted overseas. Took me a lot of contacts with JBL and the main European distributors to finally have the...
  19. Very interesting ! Yes, please, do let us know...

    Very interesting !
    Yes, please, do let us know of what tweaking you manage to identify on those drivers.
  20. I've seen this tool61326 used by a manufacturer...

    I've seen this tool61326 used by a manufacturer to measure phase plug heigths (link to page showing the tool in case the image disapears at some stage: http://www.vueaudio.com/products/h-12w-h-12n/)....
  21. OK. For 2446, 2450 etc., which are later...

    OK.
    For 2446, 2450 etc., which are later (younger) models, it's consistent. Probably there was also an evolution in respect of 2441 from 3 to 4 slits.

    I've come accross this paper from 18sound...
  22. My understanding was that bakelite material was...

    My understanding was that bakelite material was an early feature (inherited from JBL 2440, 2441), together with 3 slit (as opposed to 4 slit) cores, and that metal 4 slit cores were designed as an...
  23. Thank you Ivica for the useful info ! For the...

    Thank you Ivica for the useful info !

    For the record: I am not doing any advertising here...In my initial post, I did not even refer to a certain type of diaphragm material precisely to avoid...
  24. Thank you Ivica. We're playing with tight...

    Thank you Ivica. We're playing with tight tolerances, in principle...
  25. Hello Guido, Glad to read you (I posted a...

    Hello Guido,
    Glad to read you (I posted a question in relation to an older thread of yours, which has in fact some connection with the present one: see...
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