Do you want passive or active? I'd suggest active, as I've heard they dont have some of the phase problemes that passive filters have, and when you add inductors and capacitors to the speaker circuit, you lose a bit of power. WinISD has circuitry design calculators, but only has designs for 1st and 2nd order filters. I'm no expert, but I'd say you could wire a 1st and 2nd order active filter in series and get a 3rd order filter. The first filter would cut down to 6db/octave, then the second filter would cut down another 12db/octave giving you a total of 18db/octave. There might be some problem with that I dont know about. There's probably a design using a single transistor.
I found a webpage that calculate everything, you might want to try it out.
http://ccs.exl.info/calc_cr.html
http://ccs.exl.info/calc_cr.html
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