T, I experimented a bit(pretty much just on general principle)with my M22s when I installed my EP500, but I'd already determined(using a Stryker test-tone CD)that in-room my M22s were essentially flat to well below 100Hz(more like 70-75Hz). So, I'm using the common 80Hz crossover, although I tried 40,50,60,80.100,120,150 and 200Hz.

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Enjoy the music, not the equipment.