I have 4Pi plans and have ben planning to talk to you about it cause I can't read the whole crossover schmatic drawing, it's like not all of it is there, I've been using MSWord to view it but even by moving margins around I can't get all of it, the left side is missing. Also for now I just want to build an enclosure for the 2226's and have the horn on top in it's own baffle for now till I build the Gucci Cabs for the whole deal the 22226 and the 2235 loaded subs we talked about, if I can get them that is, which is also why I'm holding off giving it a proper effort till I know for sure what drivers I end up with as for now I only have the 2226's in my possession. Anyway for now all I really need is the recommended internal volume of the main cabinet and the crossover. THX Kelly