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Thread: Rebuilding a JBL N7000. Possible?

  1. #1
    Member qcautosports's Avatar
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    Rebuilding a JBL N7000. Possible?

    Are the internal parts of the N7000 replaceable? Are there replacement parts readily available to freshen up the old cross over?

  2. #2
    Bruno GINARD
    Guest
    HI

    THere are only 2 caps and 2 inductors........you can change it easily, and use better quality models...

    Regards

  3. #3
    Bruno GINARD
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    pics

    original circuit...........
    Attached Images Attached Images

  4. #4
    Member qcautosports's Avatar
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    So do I just go to any electronics store and show them the diagram? This is not a thing that I really do so please bear with me.

  5. #5
    Bruno GINARD
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    parts

    Hello,

    In fact , you need :

    2 capacitors, Like SOLEN or equivalent , value of 1,5 Uf, see :

    http://www.partsexpress.com/crossove...itor-index.cfm

    quality is important for HF... i use Paper OIled caps for my 2405, but they cost a lot, and are very big and heavy... you can't use them in the box of the N7000 !( but.......you can put all in another box or near the speaker...)

    and if necessary 2 inductors of 0,6 M h :

    http://www.partsexpress.com/air-core-inductors.cfm

    In my opinion, the quality of the caps is very important in the serial circuit :the cap on the line to go to the HF output

    For the inductor, it's the inductor on the line to go to LF output...

    If you have problem of scratches with the pad, try this :
    http://www.partsexpress.com/webpage....ctGroup_ID=196

    model : 260-248 OR 260-262

    the 262 are big ones !




    Warmest regards

    Bruno

  6. #6
    Member qcautosports's Avatar
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    Quote Originally Posted by Bruno GINARD View Post
    Hello,

    In fact , you need :

    2 capacitors, Like SOLEN or equivalent , value of 1,5 Uf, see :

    http://www.partsexpress.com/crossove...itor-index.cfm

    quality is important for HF... i use Paper OIled caps for my 2405, but they cost a lot, and are very big and heavy... you can't use them in the box of the N7000 !( but.......you can put all in another box or near the speaker...)

    and if necessary 2 inductors of 0,6 M h :

    http://www.partsexpress.com/air-core-inductors.cfm

    In my opinion, the quality of the caps is very important in the serial circuit :the cap on the line to go to the HF output

    For the inductor, it's the inductor on the line to go to LF output...

    If you have problem of scratches with the pad, try this :
    http://www.partsexpress.com/webpage....ctGroup_ID=196

    model : 260-248 OR 260-262

    the 262 are big ones !




    Warmest regards

    Bruno
    Do you have an idea on how ,much the big caps cost? The size will not mater as they are inside the baffle. And if they will give a better soud, thaen I'll go for that.

  7. #7
    Member qcautosports's Avatar
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    And which inductor do I need if ever I need one? Do you have a part number? So basically there are only 4 items that I have to replace internally, correct?

  8. #8
    Bruno GINARD
    Guest
    THat s right, you need 4 caps, 4 inductors,2 L pads for a pair of spkrs, plus a good quality wire...........

    For inductors it depends the price ( like for caps !)
    http://www.partsexpress.com/pe/pshow...=255-412&DID=7
    is a good choice

    what speakers do you use for HF/ and LF ?

  9. #9
    Bruno GINARD
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    CAPS /

    i have used this kind of caps, good choice for the price :

    http://www.partsexpress.com/pe/showd...number=027-528

    YOu can try 1 uf + 0.47 uf in parallel to minimise serial resistance, and to mix caps technology ( 1 Uf solen+ O,47 Kimber cap)

    JBL recommends in hf filtering a couple of caps in parallel...

    Look the serial caps on the followed scheme :
    Attached Images Attached Images

  10. #10
    Member qcautosports's Avatar
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    Quote Originally Posted by Bruno GINARD View Post
    THat s right, you need 4 caps, 4 inductors,2 L pads for a pair of spkrs, plus a good quality wire...........

    For inductors it depends the price ( like for caps !)
    http://www.partsexpress.com/pe/pshow...=255-412&DID=7
    is a good choice

    what speakers do you use for HF/ and LF ?
    It is a home brew Olympus with all the blueprint mailed from JBL 37 years ago.
    LE15A
    375
    075

    Working condition is a Conrad Johnson CJ7 Tube preamp, a CROWN DC300A amplifier, Empire troubador 598 II turn table, Forte Audio Phono Preamp.

    Can you also help me with the LX5 parts? My dad told me it's not hard to take the wax or that icky stuff off of the XO.
    They have tried replacing parts years ago and they used taiwan or Japanese parts. It never sounded the same. Now the sound is too bright / forwrd and a bit sharp. You wont last 15 minutes listening to it. Will these parts make difference? I don't mind using the big paperoiled caps you were talking about, as long as they will produce good sound, I'll go for it.

    Here are some pictures.



  11. #11
    Bruno GINARD
    Guest

    filter

    Hi

    I have several ideas to realize a better filter, based on LX 5 and N 7OOO...

    I will look the LX 5 scheme and will be back to you.

    My first opinion : try to change the HF to a pair of 2405....better for music at home. I have tried 2402 ( lemon squeezer !) and 2405, 2402 sounded too hard for me.

    SEcond : we can realize a more simple filter for the hf ...

    regards

  12. #12
    Member qcautosports's Avatar
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    Quote Originally Posted by Bruno GINARD View Post
    Hi

    I have several ideas to realize a better filter, based on LX 5 and N 7OOO...

    I will look the LX 5 scheme and will be back to you.

    My first opinion : try to change the HF to a pair of 2405....better for music at home. I have tried 2402 ( lemon squeezer !) and 2405, 2402 sounded too hard for me.

    SEcond : we can realize a more simple filter for the hf ...

    regards
    I think, switching to another model is not an option for my dad. First of, he is in the Philippines and I am in California. I just buy the parts here and send them there. He ahs been using that system since day one and he loves them. He only stopped when his SG520 pre broke. I will be starting a thread regarding that soon. He was using an all JBL arsenal. I remember the sound still. It sounded so...I don't even know hoew to describe it but you can listen to it all day without fatigue. Let me know of other updates. Also, another thread fro the SE408S repair.

  13. #13
    Bruno GINARD
    Guest

    filter

    simple circuit based on the LX5/3115 for bass/mid, and a single cap in the high to use 2402 only as a complement of the 375.

    N 7000 isn(t necessary in a domestical use

    I have a similar circuit on my 376/2405

    TRy it,

    references are parts express ones
    Attached Images Attached Images

  14. #14
    Member qcautosports's Avatar
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    Quote Originally Posted by Bruno GINARD View Post

    N 7000 isn(t necessary in a domestical use
    I don't understand what you mean.

  15. #15
    Bruno GINARD
    Guest

    N7000

    You have two cell in the N 7000 :

    One cell is a low-pass circuit, ( where the inductor is in the serial line of the signal) for the 375. It means that above 7 Khz the signal will decrease at 12 db per octave

    THe second cell is the high pass circuit, for the 2402 (the capacitor is in the line.) it means that the signal will decrease below 7 KHZ 12 db per octave.
    IN a professional use, this filter will protect your tweeter for high current below 7 KHZ; thus you can drive the lspk with a lot of power.

    THe circuit on my paper is :

    -A Lx 5 Circuit for the bass spkrs ( low pass) and for the connexion at 500 Hz for the375 (high pass above 500 Hz). The switch/transformer assembly is substituted by a 16Ohms L Pad ( but you can re-use the original assembly).

    The 375 has NO filter in the high, because the natural cut-off of the speaker about 12 Khz, and the phase turnover inducted by a 12db/octave filter.

    The bullet tweeter have only a capacitor to have a natural and sweet slope around 8/10 khz.

    My english is'nt as good as it used to be, but i hope you shall understand!

    Rgds

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