Dan, there doesn't appear to be any sensible way to reconcile the quoted language(actually p.30 rather than 29)about an appropriate crossover for each channel being set, with the display showing only the highest crossover frequency, which certainly isn't "appropriate" for the mains. You might try contacting Yamaha tech support and you might be lucky enough to find one who actually knows what's going on.

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Enjoy the music, not the equipment.