Why not try factory crossover freq.s of 400 & 2000? [from my old Audio equip directory] Looks like this is a 3 way speaker, so you'll have to use the speaker's passive x-over for one portion, since you would effectively have 4 freq. bands - high, mid, low on maggie, and sub is the 4th 'band'. I'd guess somewhere between 50 & 80 hz for the sub x-over freq. Good luck.
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