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Old 4th May 2010, 16:49   #1
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Question Adding a capacitor to a crossover/tweeters

How does one calculate the correct value of capacitor to adjust the brightness/harshness/so on of a speaker?

I remember seeing just a cap in parallel to the OE tweeters I had on my Safari.
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Old 4th May 2010, 17:09   #2
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I think what you need is L Pad

L-PADS
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Old 4th May 2010, 23:00   #3
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Quote:
Originally Posted by abhibh View Post
I think what you need is L Pad

L-PADS
No, dont think so. Guess what I meant is some method to kill the shrill at high frequency.
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Old 5th May 2010, 03:37   #4
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chances are that its was in series, and you saw it wrong. Nobody connects a cap directly in parallel with a tweeter. It would act as a short & reduce high frequencies altogether.

Or unless it was used as a cheap alternative to reduce any supersonic frequencies ( proper way to do it is to use an inductor in series, and inductors are kinda hard to get)
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Old 5th May 2010, 22:08   #5
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Quote:
Originally Posted by greenhorn View Post
chances are that its was in series, and you saw it wrong. Nobody connects a cap directly in parallel with a tweeter. It would act as a short & reduce high frequencies altogether.

Or unless it was used as a cheap alternative to reduce any supersonic frequencies ( proper way to do it is to use an inductor in series, and inductors are kinda hard to get)
Passive Crossovers
Custom Crossovers Basics

What I should have used was the term: Low Pass Filter I guess.
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Old 5th May 2010, 22:40   #6
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Caps are usually used in series to filter out the accidental DC which could fry your voice coil
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Old 6th May 2010, 03:47   #7
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an LPF is used with a woofer
as the name implies, a Low Pass filter lets only lower frequencies pass through it.
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Old 6th May 2010, 15:08   #8
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There is no implication of *low frequencies* with *Low Pass Filter*, even though the most visible applications is for sub-woofers.

JK, do you remember the value of the capacitor? Unless the capacitor was of a *very* low value, it couldn't have been across the tweeter. Nothing would have reached the speaker. IF it was a small value, then your suspicion is true - to reduce the shrillness of the tweeter (Low Pass Filter to filter out higher frequencies. Even then this is not a good method, since it would be mucking up the real response of the tweeter in a rather empirical manner.

On the other hand, if it was in series it was to prevent frequencies below a certain frequency - and DC - from reaching the tweeter (High Pass Filter).
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Old 6th May 2010, 18:15   #9
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Quote:
Originally Posted by jkdas View Post
No, dont think so. Guess what I meant is some method to kill the shrill at high frequency.
Unless you want to reduce the overall level of the tweeter using an L-Pad, your best bet for fine tuning the highs is to use the EQ in the head unit. If you had an RTA, you would be able to more accurately identify which frequencies are bothering you.
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