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-   -   Help me build a semi-active crossover (http://www.diyaudio.com/forums/parts/26971-help-me-build-semi-active-crossover.html)

officeboy 27th January 2004 06:04 PM

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?

tiroth 27th January 2004 06:07 PM

You need to know the input impedance of the following stage (probably an amp in your case). Apply the same equations using this resistance.

officeboy 27th January 2004 06:18 PM

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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