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I need help building a crossover

Discussion in 'Electronic Basics' started by Ryan Richards \(Diesel Breath\), Jun 21, 2004.

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  1. I need to make a crossover.. nothing fancy or anything... I remember in
    college we went over how to make a crossover and I think it had something to
    do with a resistor and a capacitor... Anyway, here's what I'm trying to
    accomplish...

    I have a bass rig and the cab only goes up to 5kHz... I have a component
    system; meaning I have a preamp and a separate power amp... I want to insert
    the crossover between the pre and the power so the power amp isn't wasting
    its time with frequencies that the cab doesn't even support... I need it to
    crossover at 5kHz and slope at 18dB/oct... Any help is good help... thanks
    again
     
  2. JeffM

    JeffM Guest

    Posting the same question independently to multiple groups
    http://groups.google.com/groups?q=author:&filter=0
    is not the prefered method.
    http://66.102.7.104/search?q=cache:...s-google+do-not-post-to-each-group-separately

    This practice
    robs those people who do not habitually visit all the groups
    of the wisdom of others on the topic.
    It also doesn't let everyone know
    when the question has been answered sufficiently.

    If the query is relevant to multiple groups,
    DO cross-post (within reason).
    Proper use of the Followup-To line is also useful.
    http://groups.google.com/groups?q=u...ps&selm=
     
  3. Bob Masta

    Bob Masta Guest

    It sounds like all you need is a simple low-pass filter,
    and maybe not even that. I'd guess that with a normal
    bass, there would be little enough energy above 5 kHz
    to begin with. However, if you are using effects like
    fuzz, there might indeed be a lot of extra harmonic
    energy. I don't know how serious this would be for the
    amp, but it might sound too gritty for your preferences.
    I would have thought that the preamp had tone controls
    that would accomplish this nicely, but if that is home-built
    or otherwise without them, try adding just about any
    simple low-pass filter. I assume that the 5 kHz limit
    is in the speaker itself, not the power amp, otherwise
    don't bother. Start off with a simple passive R-C filter
    between the preamp and amp. You'll need to determine
    the impedance of the amp and include it in the calculations
    for a proper design, but you will probably be well served to
    just do it by ear: Increase the R or C until you hear some
    loss in the high end with the fuzz active, and adjust to taste.

    The cutoff frequency is 1 / (2 * pi * R * C), where R is in ohms
    and C is in Farads. So for example with a 0.01 uFd cap, you
    would solve for R = 1 / (2 * pi * 5000 * 0.01x10^-6) = 3180 ohms.
    Use the nearest value you have on hand.

    Hope this helps!


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
     
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