For the sub, I was originally planning something along the lines of the LabSub. However, as these will be for pro use, I decided I am getting to old to continually lug that sort of weight around. Therefore I will be using single driver cabinets in multiples. Compared to the Labsub, these will be a bit taller (which gives better height for top boxes), about 60% the width, and not as deep (easier to fit in some venues). In that I can get longer horn path and larger than half LabSub mouth - should work well. Folding is along the LabSub lines, however longer path means more spiral overlap - looks like cross between LabSub and spiral horn. Autocad makes designing this much easier.

Cheers
Graeme