Mike, there's no problem in setting a speaker crossover higher(but not lower)than results from the Audyssey measurements. If the Audyssey setting for the VP100 was 60Hz, that means that it will provide equalization down that far and obviously includes higher frequencies. So, setting the VP100 at 80Hz(which I'd suggest)or higher won't disable any of the room equalization which is being applied to it.

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Enjoy the music, not the equipment.