[mark_in_manc]

When I was involved in acoustics, I used to teach and work a little on horn systems. I remember there seemed to be a consensus that subdividing a horn attached to one driver didn't do very much , the normal maths analysis assuming that no velocity components (pressure gradients) occur across the horn cross-section, rendering the 'web' invisible. FE analysis would reveal things here, I guess.

I wonder how true that was. I guess mechanically the web is useful in stiffening up the whole structure.

Where in frequency do you think the cut-on is for these ones? It's a simple function of flare constant, as I remember.