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

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

1. ### 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

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5,164
1,081
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

Last edited: Jan 31, 2015
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3. ### BobK

7,682
1,686
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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5,164
1,081
Dec 18, 2013
Beat me by a whisker Bob

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5. ### Tomos

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Jan 31, 2015
oh and here is the picture

3
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Jan 31, 2015