Help me build a semi-active crossover

officeboy · 27th January 2004, 06:04 PM

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 don’t know the speakers resistance I can’t 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

That’s got just what I was looking for.

Basically the same thing that fmod does.

27th January 2004, 06:04 PM	#1
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	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 don’t know the speakers resistance I can’t calculate things like inductors etc. Can anyone point me in the right direction?

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27th January 2004, 06:07 PM	#2
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	You need to know the input impedance of the following stage (probably an amp in your case). Apply the same equations using this resistance.

27th January 2004, 06:18 PM	#3
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	You always find it yourself after a post right? sigh.. http://www.t-linespeakers.org/tech/f...ssiveHLxo.html That’s got just what I was looking for. Basically the same thing that fmod does.

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