If size was no matter, and you were going to build a set of speakers, what would you build? I'm thinking of going with the line array open baffles with bass handled by either an infinite baffle sub or dipole sub.
Why not a transmission line? The tuba looks great (beleive me, I'm not knockin' on a design I haven't tried) but the sound of a MLTL imo matches the sound of open baffle very well (but I'm not sure how they will sound with line arrays...chipco?). Or maybe I've just gotten lucky.
On a seperate note, will dipole get you the extension in a subwoofer that you require? (No comment on IB, I've heard them work very well....just the cost + a big hole in the wall/ceiling )