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  1. #1
    Senior Member Skywave-Rider's Avatar
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    Altec 9844-8B

    Hi,
    I just got a pair of Altec 9844-8Bs. They use two 414 16E woofers and a 902 HF driver
    with 811B horn.

    I'd like to refresh the crossover and add a tweeter, of course that would require a custom network.

    Well, I have a pair of K-77s I took out of my Klipsch Heresies which were replaced by
    the Bob Crites tweeter. I could use those. I might, at some point in the future upgrade
    to a better tweeter (Beyma/Crites/?), so hopefully it would be compatible.

    Since I have no design skills, but can solder like a champ,
    I wonder if anyone can point me in the right direction for a crossover design that would work well.

    Thanks!

  2. #2
    Senior Member CONVERGENCE's Avatar
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    Yes you can build a 3 way second order reverse polarity crossover.

    Parts List

    Capacitors
    C1 = 1.54 uF
    C2 = 16.83 uF
    C3 = 1.37 uF
    C4 = 12.31 uF
    Inductors
    L1 = 0.4 mH
    L2 = 3.3 mH
    L3 = 0.32 mH
    L4 = 3.22 mH

    2nd Order Reverse Polarity

    6400 Hertz / 800 Hertz

    8 Ohm Tweeter / 8 Ohm Mid / 8 Ohm Woofer
    2.45 db Bandpass Gain, Spread = 8 : 3 octaves
    Attached Images Attached Images  

  3. #3
    Senior Member Skywave-Rider's Avatar
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    Thanks Convergence!
    I am currently specing out the components at Parts Express.
    I am in your debt.
    Best wishes!

  4. #4
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    Quote Originally Posted by Skywave-Rider
    Thanks Convergence!
    I am currently specing out the components at Parts Express.,,, snip ,,,,,,
    - FWIW, you should add to your order a qty of ;
    - ( 4 ) 50 watt , 8 ohm variable Lpads .
    - You'll need 2 per crossover .
    - Ask Convergence where to locate them in the circuit & how to wire them in .


  5. #5
    Senior Member Skywave-Rider's Avatar
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    Thanks, I was just about to press "submit order." Convergence, what do you think? Do those L-Pads go in the tweeter and squawker circuits? Or function as his/los? Can I do without them? I like the idea of going without them, but that might be unrealistic?
    Thanks in advance.
    Last edited by Skywave-Rider; 11-11-2007 at 12:30 PM. Reason: misread

  6. #6
    Senior Member CONVERGENCE's Avatar
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    LPad (Driver Attenuation Circuit)

    Z = 8 Ohms

    A = 2 db

    Parts List

    Resistors
    R1 = 1.65 Ohms
    R2 = 30.9 Ohms

    AFTER L3 AND C3 FOR HORN AFTER C1 L1 FOR TWEETER
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