Yeah Pete, I hear ya!
With a bar/club 3-way system, I'd be thinking along those same exact lines. But with this type of system (touring, line-array, outdoors) I think taking two lines w/ different freq. content does make a difference in addressing the problem that Jazzyvee brought to the table.... I'm sure there's a plugin you can buy for the Venue board that does all this ($20 a week), but it's more fun using Alembic equipment.... because.....
.....One can go a step further, and run a SF-2 out of the F1-X (w/ the x-over channel in band or hi pass mode).... this is a nice way of additively tuning your bass to the line array's mf-hf dispersion.
Edwin described the way frequencies collapse on themselves when they are conveyed through an inadequate system. None of these modern systems are conducive to a wavelength's travel through the dimensions as we would perceive it naturally. If you surround that wavelength with four walls, forget it! We all might as well quit while we're ahead, because it's never going to be perfect!....
