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Thread: finding a 12dB/Octave Slopes active crossover for 4344

  1. #1
    Junior Member loman69's Avatar
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    finding a 12dB/Octave Slopes active crossover for 4344

    Dear all,

    I am a JBL 4344 user in Hong Kong.
    My system is in bi-amp mode with a JBL M552 Xover and i am OK with the performance.
    Now i am wondering any 12dB/Octave Slopes active crossover is good for my system because i found the original passive Xover of 4344 is in 12dB/Octave Slopes.......

    my current system:
    CDP: EMT981
    PRE: Revox C298 mixer
    Xover: JBL M552
    Amp: Dynaudio Acoustics DCA 650(an OEM model of MC2 DCA650, 350Wx 2 in 8 Ohm) x 2

    I want an analog Xover, Bryston /Accuphase is far over my budget.....
    i tried Urei 525 before but it was not my taste....

    your recommendation are highly appreciated

    joel


  2. #2
    Junior Member loman69's Avatar
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    japanese recommendation: 18db octave slope....
    http://jbl43.net/JBL43xxlist.html

  3. #3
    Heather [Senorita member] hjames's Avatar
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    Quote Originally Posted by loman69 View Post
    japanese recommendation: 18db octave slope....
    http://jbl43.net/JBL43xxlist.html
    I have a pair of biamped 4341s
    (nearly upgraded to 4344 spec - awaiting my 2425s early next year)

    I'm using the Ashley XR1001 - 24db slope ...
    I found it an improvement on the JBL 552 I used to use ...

    Specs and such are here -
    http://www.ashly.com/product/xr-series.htm
    2ch: RPi-4, Oppo, Acurus RL-11, TFM-25, 2pr JBL L212, Heath Valencias,Von Schw VR4
    7: Oppo BDP103D, B&K, UREI 809A, JBL B460,

  4. #4
    Administrator Robh3606's Avatar
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    Well there are a couple of things you could do. You could go for a 5235 and build the cards from the ones you get with it. Problem with that is the elctronics in the 5235 are a bit dated and the M552 should be better. It would however allow you to try the 4344 with the original JBL voltage drives.

    I have 4344 clones and have run them with an M552 which I also was happy with but I am using a JBL DX-1 with 12db slopes. The DX-1 sounds better than the M552 so that is what I have stayed with. If you can find a DX-1 grab it as the cards are not all that hard to make and we have several schematics for them.

    I really need to make custom cards from the 4344 although they seem to sum properly using the XPL cards I have in there now.

    Rob
    "I could be arguing in my spare time"

  5. #5
    Junior Member loman69's Avatar
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    hi james,
    yeah i would like to try Ashly.....because it's easy to find one on ebay....


    hi rob,
    i also tried urei 525 before......M552 was more clear and transparent.
    it's very difficult to find 5234/5235 with proper cards now and i am not a DIY guy

  6. #6
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    Quote Originally Posted by loman69 View Post
    hi james,
    yeah i would like to try Ashly.....because it's easy to find one on ebay....
    Well, what do you know? Here is a nice one, right here:

    http://www.audioheritage.org/vbullet...ad.php?t=23292

  7. #7
    Junior Member loman69's Avatar
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    hi chas,

    thanks for your offer
    i will think about it......

    joel

  8. #8
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    Here's another source for you. Marchand will make any slope you like, solid state or tube-type (valves). Designed primarily for hi fi. In Rochester N.Y., USA.

    http://www.marchandelec.com/

  9. #9
    Senior Member Ian Mackenzie's Avatar
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    Joel,

    Check your pms

  10. #10
    Junior Member loman69's Avatar
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    thank you guys!

    i would like to know that how to conect my so-called 2 ways 4344 system properly.

    Connection 1: all output signal from preamp(left & right channel) go directly into my JBL M552, then the crossover divide it into HF & LF.
    HF goes into the passive crossover of 4344
    LF goes directly into the the woofer

    problem: the HF went through 2 corssovers(both M552 and internal passive crossover of 4344)

    Connection 2: my friend gave me a Y cable so the output singal from the preamp can be devided into 2.
    Singal 1(from 20-20,000hz) simply goes directly into internal passive crossover of 4344
    Singal 2 goes to M552, then the LF(from 20-320hz) goes directly into the woofers

    For me, i perfer connection 2 because the coherence and the deeper bass.

    Am I doing it right?

  11. #11
    Administrator Robh3606's Avatar
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    What position is the Biamp Switch in??

    Rob
    "I could be arguing in my spare time"

  12. #12
    Junior Member loman69's Avatar
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    Quote Originally Posted by Robh3606 View Post
    What position is the Biamp Switch in??

    Rob
    Hi Rob,

    Sorry......i am a little bit confused.
    Can you elaborate?


    thanks,

    joel



  13. #13
    Administrator Robh3606's Avatar
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    On the back of the 4344 there should be a Biamp Switch like on the 4345. What position is it in??

    Rob
    "I could be arguing in my spare time"

  14. #14
    Junior Member loman69's Avatar
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    rob,

    for sure they are in "external crossover" position...

  15. #15
    Administrator Robh3606's Avatar
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    The correct way is the feed the LF and HF amps from the outputs of the M553. No Y connectors required. It's the L/R line into the M553 and HF and LF line outs to the amps.

    It is supposed to go through the 2 crossovers on the high side.

    Rob
    "I could be arguing in my spare time"

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