Active crossover design?

Have a look at the sub-woofer controller and input buffer and high-pass filter projects on my website - use dual op-amps though. If you want more modularity and are stuck with single op-amps I have the pick-n-mix active crossover project (use the 2nd-order filters). I have a simple program on the utilities page of the website to calculate values for the filters.
 
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Hi,
is it a crossover you need or a pair of matched Low Pass and High Pass filters?

search for Ti.com
AAJ slyt306
Ti also have a large number of papers (application notes) on designing and building and correcting for errors of the various filter types.

Burr Brown also have software filter2 (S&K and MFB) and filter42 (state variable) that work well.

Try Linkwitz web site.