Crossover builder

I have been using a pair of Monsoon audio FPF-1600 audio speakers for a couple of years now and love the sound which cant be beat for anywhere near the price. Monsoon has since discontinued building speakers, both audio and multimedia. I just aquired some computer transducers whic are identical to the ones used in my towers and would like to build a center and surrounds to match my mains. What I need is someone to build the nescassary crossover for the speakers for me. Any advise?