Doesn't crossing the signal over at the 3DB point (presumably that is the 3db point for the 804's) create a 3db dip at that point (even with the sub)? I thought the concept was set the crossover point somewhat higher so that there isn't a dip. Obviously if that is higher then the sub can produce that's an issue. But its hard to conceive of a sub being inaccurate at 60Hz. Of course everyone's room and ears are different.