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Thread: Electronics help needed

  1. #1
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    Electronics help needed

    Hi guys bit of a newbie and about to embark on the carputer world but i have a quick semi related question first. Beleow are some pics of the pcb on a bass tube i have.. its ok but the built in crossover is set too low..i e you get random booms oncertain tyes of songs. Was wondering iwhere the crossover part is and if it is possible to alter/bypass this element.
    Any ideas greatfully accepted
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  2. #2
    Raw Wave Confused's Avatar
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    Welcome to the forums!

    I can't help you...but could you make that pic a little smaller, i'm scrolling like mad here, and i'm running 1400x1050!!


    Garry
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  3. #3
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    this ones a bit better... and cheers for the welcome
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  4. #4
    Maximum Bitrate gizmomkr's Avatar
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    Looks like its mostly driven by the chip (guessing here)

    Its REALLY hard to say without a schematic. Also, cant tell whats under the goop.

    The ones running at speaker level are easy, rf chokes and caps... As for this one, probably better off replacing the thing.
    Gizmo-
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  5. #5
    Maximum Bitrate MikeHunt79's Avatar
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    I'm not really an expert at this type of thing... but could another crossover on top of this one?, eg. just put in a cap of the corrent value between the speaker and the crossover?

  6. #6
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    not sure.. what i was hoping was that i could isolate the crossover and then either splice in a new one or just bypass it all together. My basic understanding of a crossowver is that it is basically a resistor ... just ondered if there was anyone here who might be able to help

  7. #7
    Low Bitrate Linus's Avatar
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    Quote Originally Posted by flick
    My basic understanding of a crossowver is that it is basically a resistor ...
    The crossover will most likely be a capacitor (usually a large-ish cylinder) an inductance (coiled wire), or some combination of the two. If I remember right, for the simplest crossovers (1st order - probably what they used because they're cheapest), capacitors are low-pass (filter out the highs) and inductances are high-pass (filter out the lows). So IF it's a 1st-order crossover and IF you find a coiled wire, you could try replacing it with a new coil with a different inductance to change the crossover frequency.

    Unfortunately, I no longer have my book on speaker construction. Then I could give you more details.

    One more thing - I'm a little confused about how you decided that your random booms are because of a too-low crossover frequency. In my experience, higher crossover frequencies are more likely to make for inconsistent, boomy bass. That, and poorly designed speakers with peaky response. So I guess what I'm saying is that playing with the crossover doesn't seem to me like it would help any.

  8. #8
    Newbie PFDarkside's Avatar
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    Give me an example of music passages with boomy bass. Is it one note that sticks out? Is there a harmonic floating above the bass note? Tell me what songs and where, and I'll listen and try to analyze from over here.

  9. #9
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    cheers for the input... basically i'm assuming that a signal range is say 1 to 10, 1 being low. Now the way i assume a bass sub should work is to pick up say 123 and no more... emphasisning the lower end, this thing seems to pick up randon booms where i'm assuming it dips lo enough to hit levels 12or3 .. ok i realise while typing this its making little sense but basically i'd be happy to alter it so it played bass and the lower end of the mid range.

  10. #10
    Maximum Bitrate MikeHunt79's Avatar
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    capacitors are actually high pass, (they block bass), and inductors are low pass (block treble)

    Search google for info, theres a calc somewhere that calulates the cap/inductance values for what frequencies you want to block

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