I recently acquired a Xilica XP-8080 active digital crossover on ebay...a new unit that had not been used, but sold as used.  The Xilica XP8080 can accept up to 8 inputs and up to 8 outputs (hence its name), and is meant to be placed between your preamplifier's outputs and your amplifiers' inputs to replace your loudspeaker passive crossovers in order to directly couple your amplifiers outputs to your loudspeaker's woofers and midrange and tweeter drivers.  Other Xilica crossovers in this series