Map, that's the 'problem', IM not so HO...the Walsh concept/approach is almost in stasis, except for the German Physiks units. Although I've not been fortunate to hear any of them, the methodology appeals to me...
(I try not to 'rant & rave', but you'll pardon me if I edge into that territory...*shrug*)
I've decided what & where I want to take my 'little project', in my odd sort of fashion.
A 3 way Walsh 'stack' has a certain 'bent appeal' to me. I realize that this might offend the 'full range F' folks (sorry, Map *G*), but it just might have 'legs'.
Start with a carbon fiber 'woofer' at the bottom.
The 'mid' (in the middle, natch) with an aluminum cone, lighter than what I'm currently using (2 mil vs. 5).
The 'tweet' up top with titanium foil.
All drivers selected for high heat resistance and capable of handling serious wattage. No more voice coil frying, no. And, loud is fun now and again...
(No wrinkles in the bass cone, either.)
The surrounds of a sorbotane/EVA laminate. The sorb on top with the EVA (which in my experience is stiffer and can hold the other up) underneath in plane.
I'll stay with the PVC for structure. Strong and has its' own absorption characteristics. Sheet stock available in black, but it likes paint for the tube stock.
I want to try to avoid 'mystery materials' on the cone interiors as much as possible, as it seems to me to be problematic in the long run. But I'll be happy to be proven wrong if that's what goes down.
Active EQ, obviously.
You heard it here, first. *G*
Lets' see how many iterations/'v.X' I get to slog through... ;)