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Question of crossover

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1#
Koifarm 發表於 2008-10-29 18:38:48 | 顯示全部樓層
Dear windwss,

The filter you show is a 6 db lowpassfilter with a impedance correction network. The L is the lowpassfilter. The RC is for impedance correction network. Other value will change the sound but if the builder done his homework right the value's are right. Why whould you change the parts?
2#
Koifarm 發表於 2008-10-30 05:44:51 | 顯示全部樓層
Alfcat, all th time i have read this forum. But had nothing to ad. And i had a new job which take a lot of energy.

Keep up the great work. I like the way you build and write about it.

Sorry for this off topic reply.
3#
Koifarm 發表於 2008-10-30 16:50:54 | 顯示全部樓層
If you change the value from 7.3 uf to 6.8 uf as you did, the crossover frequentie of the woofer goes down with 700 Hz ( asuming 8 ohm woofer). So this will sound different because there will be a 700Hz hole between woofer and tweeter.
4#
Koifarm 發表於 2008-10-31 00:35:10 | 顯示全部樓層
[quote:e9d296f6c9="WINDWSS"]dear Koifarm,

How u calculate the Frequency? still using F=1/2piRC???[/quote]

Yes.

The impedance correction network ( CR) has a crossover frequentie of 2300 Hz. Below 2300 Hz the 3.3 ohm has no influence but above 2300Hz it lowers the impendance of the woofer.
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