Yes, Michael; those who set the crossover to their mains as low as 40Hz are able to set their center and surround crossovers independently. Considering your speakers, I'd suggest that the THX researched and recommended 80Hz crossover should work well for all of them, including the M60s. There shouldn't be a good reason for setting the M60s large. Let the PC12+ handle the range up to 80Hz that it does best. Take part of the bass load off of the M60s so that they can play what they do best a little more cleanly.

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Enjoy the music, not the equipment.