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Multi-Way Conventional loudspeakers with crossovers

newbee-help with tweeter capacitors
newbee-help with tweeter capacitors
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Old 16th November 2004, 07:40 PM   #1
planktlevel is offline planktlevel  United Kingdom
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Join Date: Nov 2004
Location: bournemouth
Default newbee-help with tweeter capacitors

sorry but im here on an experimental level. and i did not like the midrange effect that i was getting from my tweeters so i have used different capacitors but i dont like the sound shape i get i used some old capacitors on the same tweeters for some other speekers i built with a wonderful detailed but minimal topend sound but i know so little here as i have just begun that i dont know what the actuall micro-farro tollerence ect. they were.
Please can you help and explain to me what these measurments do and what i should look for if i want a very topend sound with none of that mid treble but without detail loss.I know its more complecated than this but i have to start on an experimental level as i learn.......thankyou
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Old 16th November 2004, 07:53 PM   #2
BillFitzmaurice is offline BillFitzmaurice  United States
Join Date: May 2004
Location: New Hampshire
The first thing you want to do is stop substituting caps if you don't know what you're doing or you stand a good chance of frying your tweeter voice coils. Read a book on DIY loudspeaker building, most will have a section on crossovers, so you know what's safe to do and what is not. Experimentation is a good thing but can be costly if you don't have some training in theory first.
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Old 16th November 2004, 09:16 PM   #3
gary f is offline gary f  Canada
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Join Date: Aug 2003
Location: Quebec city
What kind/brand/model of tweeter is it??

Capacitors are used to stop the low frequencies from entering the tweeter. The higher the value of the capacitor is, the more you have low frequency passing throught the tweeter.

don't put capacitor with values above 4 or 6 uF in serie with the tweeter or you may damage your unit. general advice.

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Old 17th November 2004, 02:22 PM   #4
RJ is offline RJ  United States
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Join Date: Oct 2004
Maybe the fault is not the tweeter. Woofers have breakup modes around 4000 hz and up.
This woofer starts breaking up at 7000 hz. See first graph;

Maybe what you need is an inductor to help flatten the breakup. Example: 1 - 8 ohm tweeter and 1 - 8 ohm woofer to be crossed over at 3000 hz.
Put a 0.42 mh coil in series with the woofer + connection and a 6.6 uF cap in series with the tweeter speaker.
Two sites that will help you with your problem

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