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Thread: 4345 Crossover Parts FS

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    4345 Crossover Parts FS


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    Senior Member BMWCCA's Avatar
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    Quote Originally Posted by RC Driver View Post
    Thanks for reviving one of my favorite threads!

    As a point of order and propriety: Do you have an interest in the products as the seller, a satisfied user, or otherwise??
    Inquiring minds want to know.

    And welcome to the LH group.
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

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    Quote Originally Posted by BMWCCA View Post
    Thanks for reviving one of my favorite threads!

    As a point of order and propriety: Do you have an interest in the products as the seller, a satisfied user, or otherwise??
    Inquiring minds want to know.

    And welcome to the LH group.
    I'm a seller of those details. 2.5 years ago I made and installed this biamping crossower in my JBL-4345. Very good step ahead.
    I'm living with this version more than 1.5 year with pleassure and satisfaction.
    Next I found autotransformers and I replaced the aircore inductors.
    Autotransformers are hard to find - it is necessary to make like order.
    Improvements may have been but at the level of self-hypnosis.
    But to return to the air core inductors I did not. Laziness.
    The some details lying of the year - maybe anyone be required.
    Participants of the forum - an additional discount.
    My schematic now:
    Name:  __Ver 2_2_AVT 4345 Bi-Amp.jpg
Views: 6110
Size:  49.8 KB

  4. #4
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    Some photos:
    Name:  B1.jpg
Views: 2982
Size:  91.4 KBName:  F1.jpg
Views: 2935
Size:  80.5 KBName:  F3.jpg
Views: 2909
Size:  95.7 KB

  5. #5
    Senior Member ivica's Avatar
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    Quote Originally Posted by RC Driver View Post
    I'm a seller of those details. 2.5 years ago I made and installed this biamping crossower in my JBL-4345. Very good step ahead.
    I'm living with this version more than 1.5 year with pleassure and satisfaction.
    Next I found autotransformers and I replaced the aircore inductors.
    Autotransformers are hard to find - it is necessary to make like order.
    Improvements may have been but at the level of self-hypnosis.
    But to return to the air core inductors I did not. Laziness.
    The some details lying of the year - maybe anyone be required.
    Participants of the forum - an additional discount.
    My schematic now:
    Name:  __Ver 2_2_AVT 4345 Bi-Amp.jpg
Views: 6110
Size:  49.8 KB
    Hi RC Driver,

    May be I am wrong, but here using auto transformer, I think that You have take in account the auto-transformer inductance at the secondary output....
    so may be to simulate the response of the network with and without the transformer....

    regards
    ivica

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    Quote Originally Posted by ivica View Post
    Hi RC Driver,May be I am wrong, but here using auto transformer, I think that You have take in account the auto-transformer inductance at the secondary output....so may be to simulate the response of the network with and without the transformer....regardsivica
    Those autotransformers I ordered at Moscow' workshop. Master made computer' calculation specifically for 4345 speakers. Very good English iron. Certainly looks not so good, but working fine.When I ordered autotransformers I mean the original crossover 3145 using autotransformers too. But this is very expensive way :-(Here the photo and schematic of the first version:Name:  T3-sm.jpg
Views: 2944
Size:  77.1 KBName:  T2-sm.jpg
Views: 2768
Size:  73.6 KBName:  _Ver 1fin +Bypass Bi-Amp.jpg
Views: 4624
Size:  53.3 KB

  7. #7
    Senior Member ivica's Avatar
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    Quote Originally Posted by RC Driver View Post
    Those autotransformers I ordered at Moscow' workshop. Master made computer' calculation specifically for 4345 speakers. Very good English iron. Certainly looks not so good, but working fine.
    When I ordered autotransformers I mean the original crossover 3145 using autotransformers too. But this is very expensive way :-(

    Here the photo and schematic of the first version:
    Name:  T3-sm.jpg
Views: 2944
Size:  77.1 KBName:  T2-sm.jpg
Views: 2768
Size:  73.6 KB
    Attachment 65202
    Hi RC Driver,

    Are You sure that connection pin 2 and 3 on the L-pads has to be connected in the way as shown on the schematic.
    I would expect that the wire between pins 2 and 3 has to be cut.

    regards
    ivica

  8. #8
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    Quote Originally Posted by ivica View Post
    Hi RC Driver,

    Are You sure that connection pin 2 and 3 on the L-pads has to be connected in the way as shown on the schematic.
    I would expect that the wire between pins 2 and 3 has to be cut.
    regards
    ivica
    Yes, off course. This is mistake on schematic. Big sorry.
    I did't change any other details in 4345 except networks.
    I use original L-Pads, wires and terminals.
    I can't to change schematic in post 3.
    Sorry again.
    Question - [email protected]

  9. #9
    Senior Member ivica's Avatar
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    Quote Originally Posted by RC Driver View Post
    Yes, off course. This is mistake on schematic. Big sorry.
    I did't change any other details in 4345 except networks.
    I use original L-Pads, wires and terminals.
    I can't to change schematic in post 3.
    Sorry again.
    Question - [email protected]
    Hi RC Driver,

    may be a model of auto transformer here, and the inductivity influences would helpful

    http://educypedia.karadimov.info/library/1_11.pdf

    regards
    ivica

  10. #10
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    Smile

    After some time I changed a topology my version.
    I've made some mistakes.Here is ver.4:
    Name:  IMG_0271.jpg
Views: 2580
Size:  97.5 KB
    I can say this is very good result :-)
    Attached Images Attached Images  

  11. #11
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    List

    hi can you help me? I need to make a list of the components that I need to buy the components thanks

  12. #12
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    Question

    Commenting on the bass section of this crossover the 5.4mH inductor and the 80uF cap define the 2nd order filter shape, the shunt components 20uF cap and 7.5 ohm resistor look like a zobel network, but what does the 10uF shunt capacitor do?
    Thanks
    DM

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