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Crossover or Hipass??

Discussion in 'Electronic Repair' started by Jammin Jimmy, Jul 29, 2004.

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  1. Jammin Jimmy

    Jammin Jimmy Guest

    Updating some old speaker cabs Disco type, previously they had a 15" driver
    and a peizo just soldered together and sounded quite good, I have new
    speakers and now I see bullet tweeters that require a crossover or hi-pass,
    the crossover is about 2x the price of the hi-pass, could someone give me
    the pros and cons?
    Thanks
     
  2. JURB6006

    JURB6006 Guest

    If the woofers are directly connected, you'll get better response by simply
    using a capacitor. The woofer's response is dropping at an uncontrolled rate,
    probably around 3-4 Khz.

    Without frequency response and impedance curves it's difficult to arrive at the
    proper value. You probably can find the response curve for the old tweeters,
    but without knowing the impedance curve of the new ones you'll have to play it
    by ear.

    Of course we're talking club speakers here, not Canton monitor speakers (ever
    hear them ? awesome reproduction !). Club speakers need a good amount of "boom
    & tingle", and adequate midrange between.

    Order you some capacitors, NOT electrolytics, get good poly dipped or some
    other high quality non-polars, high quality caps actually do sound better. I
    know.

    If you have a ten band EQ you can find the rolloff of the woofers, but you
    still don't have the actual impedance curve so it's still hit/miss.

    I'd start with 2.2uf, and have a bunch of 1 ufs on hand to add in paralell. If
    it uses multiple tweeters you must multiply by their number. Make sure you get
    caps rated 100 volts. They should be fine up to about 200 watts.

    If you wish you can start experimenting with bipolar electrolytics, once you
    arrive at a value then order the good ones. Starting with 2.2, adding a 1 will
    make it 3.2, if it sounds good there, order 3.3s, if you need two 1s, you might
    want to go with 4.7s. Just get as close as you can. If the value falls into a
    non-standard value, there are other ways, but the best way is paralell, then
    they share the current. Use them in series only if absolutely nessecary, also
    figuring it out is harder, you need to add the reciprocals of the values
    instead of just adding them up.

    As far as the boxed highpass filter, how do you know what frequency to get,
    also it'll only work properly on one tweeter (also true of a crossover).

    Keep me "posted". Good luck.

    JURB
     
  3. Asimov

    Asimov Guest

    "Jammin Jimmy" bravely wrote to "All" (29 Jul 04 23:04:14)
    --- on the heady topic of "Crossover or Hipass??"

    JJ> From: "Jammin Jimmy" <>

    JJ> Updating some old speaker cabs Disco type, previously they had a 15"
    JJ> driver and a peizo just soldered together and sounded quite good, I
    JJ> have new speakers and now I see bullet tweeters that require a
    JJ> crossover or hi-pass, the crossover is about 2x the price of the
    JJ> hi-pass, could someone give me the pros and cons?
    JJ> Thanks

    I feel bi-amping is more flexible than passive crossovers for big
    speakers. There is much less distortion and lower losses to begin
    with. Also the electronic filter design is much more precise and can
    be a brickwall by comparison. What is more, many preamps have tunable
    biamping outputs. Given a choice, passive crossovers are better suited
    for bookshelf or small room speakers.

    A*s*i*m*o*v

    .... Over a hundred billion electrons were used in crafting this tagline.
     
  4. Jammin Jimmy

    Jammin Jimmy Guest

    Thanks but most of this is a bit to technical for me, what I was asking is
    the same firm supply the boxed Hi pass the boxed crossover and the
    tweeter,they say thay both will do the job but thre crossover is double the
    price of the Hi pass
     
  5. Jammin Jimmy

    Jammin Jimmy Guest

    Thanks I can ony use the existing old amp and desk in this situation
     
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