Thanks dante, I thought that would be best, but always worth asking!You should try to include a 10Hz overlap as opposed to a hole not covered. The 10Hz overlap should give better rolloff and transition. Set the crossover higher than the speakers' lowest ability as opposed to setting it lower or you'll end up with a hole that will not be covered by either the speakers or the sub.
Might be a q for one of the Anthem threads, but I see a lot of posters get the same result with different room correction systems, where it sets the crossover to less than it should be. In my case less than the speakers can actually go down to. Surely a decent room correction system, particularly the highly regarded ARC should detect the lowest frequency supported by the speakers? Or has it been confused by the BK that goes up to 120Hz?