diyAudio Forums Archive > Top > Other Stuff > Electronics and Parts Help me build a semi-active crossover - Click HERE for Original Thread officeboy 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/show...t_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 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 You always find it yourself after a post right? sigh.. http://www.t-linespeakers.org/tech/...assiveHLxo.html That’s got just what I was looking for. Basically the same thing that fmod does.

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