Help me build a semi-active crossover

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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/showdetl.cfm?&Product_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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