http://www.linkwitzlab.com/filters.htm
http://www.ethanwiner.com/filters.html
http://www.electronics-tutorials.com...ss-filters.htm
http://www.antonine-education.co.uk/...rc_filters.htm
It's worth to read it all, but the formula for the reactance is here. http://www.antonine-education.co.uk/...ve_filters.htm
HTH and good reading
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