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Well, if you know the crossover points of the crossovers, you can get a set of other brand name crossovers that are similar.
Or just get another 2 channel amp and invest in an electronic crossover.
MB Quart MUSiCOMP crossovers I think have a crossover setting of 3700. Most of them have a set HPF/LPF of around 3000-5000Hz. Polk Audio is around 900 and Alpine is 1500 for the Type X.