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Passive x-over question

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Old Nov 7, 2003
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Question Passive x-over question

If I were to put a 6 ohm tweeter on a passive crossover than is made for a 4 ohm tweeter will if affect the crossover frequency? How would it be affected.

thx
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Old Nov 7, 2003
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What's the frequency range of the tweeter?
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Old Nov 7, 2003
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Originally posted by darklegacy540
What's the frequency range of the tweeter?
Why would that matter...I am sure both tweeters are equal in that regard, because the crossover that comes with each is at 2500 hrtz...I wondering if the difference in ohms can affest the x-over.
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Old Nov 7, 2003
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Re: Passive x-over question

.
Originally posted by fonto
If I were to put a 6 ohm tweeter on a passive crossover than is made for a 4 ohm tweeter will if affect the crossover frequency? How would it be affected.

thx
Excellent question Fonto. I really dont think it would change anything being 6 ohms. I think it would stay the same from 4 ohm to 8 ohm. Now if you were using a 2 ohm tweet, then i think it would change the crossover frequincy.
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Old Nov 7, 2003
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check-out the "passive crossover" section of this website... from my understanding they say it will change?

Basic Car Audio


....hmmm, this is tough to understand, I dunno what is right.
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Old Nov 8, 2003
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I think it will, a passive crossover is mostly just a bunch of inductors and caps. I think that it will change the crossofer frequency. If you look at crossover building sites, there's a chart of capacitance and inductance for specific speaker resistance, for example:

The Inductance and Capacitance of an 8 ohm speaker crossed over at 4000 Hz is 0.33 mH and 5 µF respectively. At 4000 Hz, a 4 Ohm speaker needs a 0.16 mH inductor and 10 µF Capacitor.

Given the same Capacitance and inductance, a different Speaker Impedence should change the crossover frequency. I'm not sure whether it will go up or down though.
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Old Nov 8, 2003
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Ed, I think you are right...the crossover frequency will probably go down.

Originally posted by Ed
I think it will, a passive crossover is mostly just a bunch of inductors and caps. I think that it will change the crossofer frequency. If you look at crossover building sites, there's a chart of capacitance and inductance for specific speaker resistance, for example:

The Inductance and Capacitance of an 8 ohm speaker crossed over at 4000 Hz is 0.33 mH and 5 µF respectively. At 4000 Hz, a 4 Ohm speaker needs a 0.16 mH inductor and 10 µF Capacitor.

Given the same Capacitance and inductance, a different Speaker Impedence should change the crossover frequency. I'm not sure whether it will go up or down though.
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Old Nov 8, 2003
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it will definitely affect it.

he frequency should go down, by 2/3. but thats what information winISD gives me concerning passive 1st order filters, could be less, could be more.

but if the impedance goes up by 1/3rd on a 1st order passive filter, the cutoff goes down by 1/3rd (3000 to 2000)
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Old Nov 8, 2003
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Originally posted by WhiteRabbit
but if the impedance goes up by 1/3rd on a 1st order passive filter,
It'll vary on what order x-over you use. 1st order, 4th order, etc etc etc..
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Old Nov 9, 2003
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cool, I learned a lot by looking this stuff up online
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Old Nov 9, 2003
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also check out http://www.passivecrossovers.com/
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