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Old 27th January 2004, 06:04 PM   #1
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Default Help me build a semi-active crossover

I've been searching for a few hours, and I can't find anything simple enough for what I need.
I want to make something very similar to these fmod crossovers
http://www.partsexpress.com/pe/showd..._ID=6765&DID=7

The only designs I can find for active type crossovers include opamps and that seems much too complicated.

Essentially I want to build a passive low pass crossover for a line out I guess. But since I donít know the speakers resistance I canít calculate things like inductors etc.

Can anyone point me in the right direction?
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Old 27th January 2004, 06:07 PM   #2
tiroth is offline tiroth  United States
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You need to know the input impedance of the following stage (probably an amp in your case). Apply the same equations using this resistance.
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Old 27th January 2004, 06:18 PM   #3
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You always find it yourself after a post right?
sigh..

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

Thatís got just what I was looking for.

Basically the same thing that fmod does.
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