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  1. Hello Well, if you know the exact frequency...

    Hello


    Well, if you know the exact frequency cut off and only play it on the 15 '', note the level in dB or dBA. Then you increase the power of 8 '' until you have + 3 dB or dBA that goes. Then...
  2. Thread: Homebrew 4343

    by B&KMan
    Replies
    109
    Views
    40,825

    strait reproduction or improvement?

    hello again,

    be shure your project to replica of crossover keep factor of the change the recone 2235 in basket of 2231 , same as 10 and horn. the original design is better with original driver...
  3. Thread: Homebrew 4343

    by B&KMan
    Replies
    109
    Views
    40,825

    ohms and power output

    hello,

    the small difference is relevant on power output. this type of crossover came with a pot jbl fine tune ouput. so normally it is fine...

    :cheers:
  4. Thread: Homebrew 4343

    by B&KMan
    Replies
    109
    Views
    40,825

    active or passive network ??

    Hello,
    I understands that you reproduced that partly the original circuit of JBL 3143??

    if it is the case, you will butt yourselves like me to the hollow between the 15 and the 10. However you...
  5. Replies
    137
    Views
    24,851

    Glup !!

    mmmmmmmmmm

    are you ready for an earthquake??

    maybe yes but your CD rack and your turntable surely not :D

    nice and real stuff.

    play loud and look !!!
  6. Replies
    41
    Views
    11,957

    resonnance vs reflexion.

    Hello,

    Well, well, well,

    acoustic treatement is really complex :D

    No exist ideal room size but exist less poor size room... :applaud:


    first , 2 separate problems in same expression.
  7. Replies
    136
    Views
    36,189

    active network and correction time of UHF 2405 on 4343

    I wanted simply to add another information... The integration of the delay of the 2405 in the 4343 is bad it is necessary to put a delay of 0.613 ms approximately. If you use an active network which...
  8. Replies
    136
    Views
    36,189

    2231 with JBL 4343 network

    Hello with all, I arrive at the end of this other eternal problem of the polaity and the phase in the 4343... My experiment of the 2231 shows clearly that it has better an extension of the high...
  9. Replies
    136
    Views
    36,189

    the rule is simple : hard as possible and maximum...

    the rule is simple : hard as possible and maximum weight & stability stand create a real better transfert impact and less coloration.

    I invite you to keep a few time to explore many many points on...
  10. Replies
    136
    Views
    36,189

    here : the test difference after (upper graph) ...

    here : the test difference after (upper graph) and before cancel switch of bi-amp on back of the 4343


    http://www.audioheritage.org/vbulletin/showpost.php?p=52144&postcount=113
  11. Replies
    136
    Views
    36,189

    not a polarity internal connections question agains....

    OH NO !!!!

    Eternal drama...


    I'm called JBL In california headquarter on this question and the red post is really positive signal and black is negative signal...

    the reason why the driver...
  12. Replies
    136
    Views
    36,189

    Sorry for my poor english but I smell a couple of...

    Sorry for my poor english but I smell a couple of idea to help you.

    First your wood stand under 4343 is bad principe and unstabilize the speaker.

    2-- the speakers is go down freq realy more...
  13. Replies
    26
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    28,463

    Amazing report...

    Well, very hard job here, just 2 cheaps words to explain my great thanks for your gift of the big amount of critical informations/experiences into this thread.

    You have put a big amounts of...
  14. Replies
    294
    Views
    164,802

    Oh yes!! the first hand information is all the...

    Oh yes!!

    the first hand information is all the time better, especially from the first master ingeneer JBL... thanks Mr. Timber.

    Many juice in few words, mmmmmmmmmmmmmm

    :applaud: :applaud:...
  15. Replies
    137
    Views
    24,851

    mmmm I hope you not make a nightmare psycho bass...

    mmmm I hope you not make a nightmare psycho bass killer :applaud:

    iiraaarrrrrgrhhhllllll

    I explain more serious methods.

    keep any shareware who create a pure tone sweep gently or try to...
  16. Replies
    137
    Views
    24,851

    BOX FOR BOX

    OK DOKAY, if you have try -it all and you have problem again check this solution...

    first you understand the risk of diagnotic and the erratic solution via over sea ;)

    of course with intensity...
  17. Replies
    137
    Views
    24,851

    diaghostic...

    well problem problem...

    fix variables.

    ---test tone or music :

    try with excellent quality headphone to compare signal speakers and headphone for detect problem performance driver, network,...
  18. Replies
    137
    Views
    24,851

    mmmmmm.... maybe the headphone position is...

    mmmmmm.... maybe the headphone position is better :barf:
  19. Replies
    137
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    24,851

    Hello, please push more details explanation if...

    Hello, please push more details explanation if you wish help...

    p.s. your speakers is a BIG BIG BIG speaker...

    the integration in room is really triky.

    do you have any instrument mesure ??...
  20. Replies
    137
    Views
    24,851

    the intensity Power is drop of 3 db by double...

    the intensity Power is drop of 3 db by double extension space. !!

    THIS is a pysical law ... try !!

    (and I'm not touch the point where the level of power vibration your speaker is put in the...
  21. Replies
    20
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    7,366

    Bass trap rule.

    Hello,

    Your wish is impossible

    any room is particular and the complete rule is complexe and need a specialise instruments who rarely person buy or rent.

    but maybe hint is help you... the...
  22. Replies
    137
    Views
    24,851

    acoustic rules

    Hello Leif, (and baldrick )

    You have a beautiful piece and excellent system. Your problem is integration acoustic rule in your set-up. The speaker on the floor create more pressure in bass (6...
  23. Replies
    15
    Views
    9,947

    tolerance pole and magnet.

    Hello,

    My comprehension on why JBL is only glued magnet is :

    the magnet is fragile material. the best perfect conctact to magnet and metal pole piece, the better than. Normally the metal...
  24. Thread: dB Equations

    by B&KMan
    Replies
    17
    Views
    6,058

    as you wish ZilchMaster :D

    as you wish ZilchMaster

    :D
  25. Thread: dB Equations

    by B&KMan
    Replies
    17
    Views
    6,058

    formula for calculate r1 and r2

    Hello Earl,

    I try to explain my informations found in book, maybe help maybe not...

    is explain formula for a constant impedance.

    see pict...

    :cheers:
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