Page 27 of 35 FirstFirst ... 172526272829 ... LastLast
Results 391 to 405 of 515

Thread: 4343 crossover modifications

  1. #391
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492
    Quote Originally Posted by Ian Mackenzie
    Okay,
    Sometimes there are no words to describe what you hear, this is one of those moments.
    What I can say is there appears to be a certain order about what is heard.
    There is also the most believable life like expanse of sound such that you are projected to the venue of the recording.

    Oh yes .... WOW : better fine craftman than my project

    And in fact, I prefer the simplifying components appproach, less parts, less connection, better theory approarch !!!....

    few question...

    1--- time burning before exclamation ???
    2--- what is network before ???
    3--- better details of construction ???
    4--- electrical slope ???
    5--- This is not a 4343 what is this model ???
    6--- Wath is schema of this network, I look not a Dc-Charge...
    7--- More details wiring, solder, etc ???




    Jean

  2. #392
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    Ah Jean this is not a competition.....I mean hello

    few question...

    1--- time burning before exclamation ??? 1 minute...
    2--- what is network before ??? 3145 0riginal eqiivalent
    3--- better details of construction ??? Are you kidding
    4--- electrical slope ??? refer to (2)
    5--- This is not a 4343 what is this model ??? Hello , refer to build 4345 thread
    6--- Wath is schema of this network, I look not a Dc-Charge... Obviously
    7--- More details wiring, solder, etc ??? A few pages back I post details
    http://www.audioheritage.org/vbullet...&postcount=366

    Would you like me to try it full of sand? I have plenty at the local beach 300 metres away

  3. #393
    Senior Señor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Quote Originally Posted by Ian Mackenzie
    Sometimes there are no words to describe what you (see), this is one of those moments.
    Dammit! I have been lame on sending the JBL Blue swatch! Sheeeeeit!

    Sorry dood - will get one posted, today!

    Can you post any measurements of the response, before and after, or is it not something that will impress much in the measuring...?
    bo

    "Indeed, not!!"

  4. #394
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492
    Quote Originally Posted by Ian Mackenzie
    Ah Jean this is not a competition.....I mean hello

    Would you like me to try it full of sand? I have plenty at the local beach 300 metres away


    Sorry If I ask questions who responses is already posts...

    But this thread is realy long and it is better easy to resume little bit at few time for better easy compehension and appreciation works...

    Well for your first comments... I try to understand where my posts suggest this attitute ??? My intention is just relevant the finest of craftwork: that is that all... Your soldering, your metal work, paint, screw, all is look very clean !!!

    This is just a compliment... as same many peoples write "giskard is a king of schema" or "Earl is sharp eyes" ... this a compliments not a competition

    anyway, bravo again and I subscribe to post of Boputnam...

    Jean.

  5. #395
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492
    I have succeeds has to have a little times to make the electrical
    measurement of BigNet for found the problem...

    first :
    To ensure me of the precision of measurement I compared the signal of
    origin with that received by wire of BigNet. (measurement taken on wire of the internal connection of the terminals speakers)

    The result shows that the addition of all wires, connectors and electronic, vary the response only of 0.25 dB...

    x1= original signal
    y1 = response signal

    so the problem is the rest of system...
    Attached Images Attached Images  

  6. #396
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492

    verification step 2

    Each parts is individually verified with the reference instrumental at Solen before fixing ...

    ex: in this the big caps is not a real 160uF it is 158 uF so if I add the second 18,2uF plus the bypass 2 Uf + ,01uF the total is

    158.000
    018.200
    001.993
    000.001
    ======
    168.994 effective => 170.001 theorical so 0.5 % real deviation !!!
    the inductor is specifiquely built for value and verified before and after: 1% variation (difficult because any metal arround affect precision...) anyway largely inside of tolerance design...

    so new parts is systematically mesured and verified...

    so no problem in this way...
    Attached Images Attached Images   

  7. #397
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492

    verification step 3

    The electrical measurement of the HP are not taken at the post
    of the drivers, but rather with the last on the connection of the last wire of exit on Bignet. The negative one being always taken in the same place as reference measurement (on the interior wire of the terminal speakers)...

    Ok ...

    This is comparison of hf and uhf response in 1/3 octave and 1/24 octave.

    the theorical crossover frequency is +- 8750 and I have a 8650.

    (n.b. the 2 pict the curve is collapsed because I set-up set-up for go up to 40K for more separation of curve of uhf and the weight A & Line representation
    As zilch relevant in later post ( and my eyes too) I have rool over at 2 k ... this is the reason I put low the L-Pad... this coincidance is look at peak impedance of this old original diaghram... maybe one response false is here...
    Attached Images Attached Images   

  8. #398
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492

    comments mesures of step 3

    After checking of the original response curves with those obtained(thanks again at giskard to give original pict), I notice 2 problems important.

    1 --- the lack of being able of the UHF makes so that acoustic
    energy, product by the addition of the two curves, is weakened... By restoring the capacity of the UHF one should obtain a more
    horizontal response around 7-9k.

    2--- the original driver with diaphram is not same impedance and probably the notch arround 2K is not present in newer diaphram...

  9. #399
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492

    verification step 4

    verification on med and hf response in 1/3 octave and 1/24 octave for check cross curve...

    the original is 1600 hz ( on paper curve) and my mesure expose a arround 1520hz curve.

    the form of curve is not same fla because it not a same diaphram in med and in hf.
    Attached Images Attached Images   

  10. #400
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492

    L-Pad Hf

    I try to push up the L-pad for boost signal (avg 2 dB) and of course the response is same defective.

    See pict.



    According to electrical response the drop is really high ...

    Soldering problem ???

    anybody have a hint to detect bad solder point ???
    Attached Images Attached Images  

  11. #401
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492
    In agreement with the track of the impedance that several raised, and in glances with the great lack of being able of the UHF I took on
    me to cancel resistances of 6.5 ohms in series and parrallèle at the
    end of the circuit of the UHF....

    the adjustment of L-pad is to +1 and produces the following result...

    (...)
    Attached Images Attached Images   

  12. #402
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    Quote Originally Posted by boputnam
    Dammit! I have been lame on sending the JBL Blue swatch! Sheeeeeit!

    Sorry dood - will get one posted, today!

    Can you post any measurements of the response, before and after, or is it not something that will impress much in the measuring...? Basically the latter

    No worries,

    Just get a ruler on some graph paper and draw a 12 inch line.

    Frankly I find stuff that particularly boring, people read too much into measurements before they listen...I find it helps if you know what your doing in the first place. The measurement kit basicslly tells me if I have scewed up some where although I've seen a small hand held 1/3 unit by Ivie ? I really like the pretty bar graph.

    Its all about your ears Dude..as you know too well.

    Ian

  13. #403
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    Quote Originally Posted by B&KMan

    Sorry If I ask questions who responses is already posts...

    But this thread is realy long and it is better easy to resume little bit at few time for better easy compehension and appreciation works...

    Well for your first comments... I try to understand where my posts suggest this attitute ??? My intention is just relevant the finest of craftwork: that is that all... Your soldering, your metal work, paint, screw, all is look very clean !!!

    This is just a compliment... as same many peoples write "giskard is a king of schema" or "Earl is sharp eyes" ... this a compliments not a competition

    anyway, bravo again and I subscribe to post of Boputnam...

    Jean.
    I understand....it was only a joke....and there are certain cultural barriers on the internet.This is why I love to call Ken Alphabet when he is in dire need of assistance...I love his laugh.......and then he knows I'm not being a smart arse.

    This unit I built for another member in America for his 4343-4344 upgrade

    I think he will like it.

    Ian

  14. #404
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492

    electrical curve of modification circuit uhf 2405

    Well, for complete this job I re-keep the mesure of the electrical driver with L-Pad placed at goos mic set-up...

    the result is the curve of uhf is less flat, in particulary the 20k is higher, but overrall response appear more flat and normal....

    (see pict)

    n.b. the uhf is play more higher but at measurement has which go up in Hz, the frequencies are proportionally attenuated by the distance... and directivity. So you remark the 20K is more down than electrical value...

    Anyway, in this it not perfect but it is play more correct... now I wait the another time for final placement....

    I try to buy a mils spec resistances recommended by list parts of giskard... for improvement result... and after last this modification I go in beach and I put a ionized sand in network (yulk yuk yuk )

    It is joke... I put the cover and fill dry sand of special quartkz sand...

    anybody;

    Do you feeling I hope to put little value resistance for help to flat impedance electrical ???

    or this is just OK???

    anybody have a experiment this problem with dc charge and uhf ???

    thanks at all.


    Jean.
    Attached Images Attached Images   

  15. #405
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492
    Quote Originally Posted by Ian Mackenzie
    I understand....it was only a joke....and there are certain cultural barriers on the internet.
    Ian
    add problem of barriers of language and read and write post easely ... out of phase....

    yuk yuk yuk ...


    Jean.

Thread Information

Users Browsing this Thread

There are currently 5 users browsing this thread. (0 members and 5 guests)

Similar Threads

  1. Ashly XR1001 Active Crossover
    By boputnam in forum Electronic Crossovers
    Replies: 156
    Last Post: 10-06-2009, 09:58 AM
  2. JBL 4343 external crossover needed? help!!!
    By catcaster1 in forum Lansing Product Technical Help
    Replies: 5
    Last Post: 12-29-2004, 09:23 PM
  3. Questions about the Ashly XR1001 Active Crossover
    By porschedpm in forum Lansing Product Technical Help
    Replies: 1
    Last Post: 12-19-2004, 02:37 PM
  4. Upgrading a 4343 to 4344 components
    By porschedpm in forum Lansing Product Technical Help
    Replies: 9
    Last Post: 10-29-2004, 10:45 AM
  5. L300 convert to 4343?
    By tv506 in forum Lansing Product Technical Help
    Replies: 1
    Last Post: 10-24-2003, 12:08 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •