First Watt or Marchand would be great. Depends how much you want to spend and if you want to take time to find one used. For me, even very low cost TDM or DBX sounded better than passive crossovers. Best wishes.
Check out the DBX units. I realize they're a A/D then D/A, but with all those possible adjustments I wouldn't worry about the digital conversion. This will be your best solution. Don't fear the digital processing as it's more accurate than the analog versions, and a whole lot cheaper.
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