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D.I.Y Speakers-Tweeter Problem :-(

Discussion in 'General Electronics Discussion' started by Tomos, Jan 31, 2015.

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  1. Tomos

    Tomos

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    Jan 31, 2015
    I have recently bought some tweeter capacitors for my tweeters (so they can work like tweeters) but I connected it up and it just passed audio through and I even played a low frequency and the tweeter was acting like a woofer! I knew this wasn't right so I connected it up a different way and it still did the same. I got it from amazon and for a second I thought they hadn't named it right, because they definitely got the picture wrong! I don't understand why it is not working. Can anybody give me some guidance please! :)


    Here is the amazon website:
    http://www.amazon.co.uk/3300uF-Spea...=1420914303&sr=8-1&keywords=capacitor+tweeter
    Photo on 31-01-2015 at 09.27.jpg
     

    Attached Files:

  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Hello
    The value looks rather large for a tweeter capacitor. I would expect around 22uF not 3300uF. Formula for frequency roll off = 1/2*pi*R*C = 1/2*pi*8*22uF = 904 Hz The 3330uF cap will have frequency roll off of 1/2*pi*8*3300uF = 6Hz so this is why your tweeter is responding to pretty much all frequencies.
    Thanks
    Adam
     
    Last edited: Jan 31, 2015
    Tomos likes this.
  3. BobK

    BobK

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    Jan 5, 2010
    A 3300uF capacitor will pass the entire audio spectrum into a 4Ω or 8Ω speaker. The -3dB point is 12Hz for a 4Ω and 6Hz for an 8Ω. This is not a useful capacitor for a tweeter crossover.

    So, your results are as expected.

    A tweeter crossover would be on the order of 10uF, depending on the speaker impedance and the crossover frequency you want.

    Bob
     
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  4. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Beat me by a whisker Bob :)
     
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  5. Tomos

    Tomos

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    Jan 31, 2015
    Ok thanks Adam very much helpful
    oh and here is the picture Photo on 31-01-2015 at 17.16.jpg
     
  6. Tomos

    Tomos

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    Jan 31, 2015
    thanks very helpful
     
  7. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Thanks
    Adam
     
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