A general question: The product line has a few "levels", but the models within each general alignment catagory seem similar, so I'm assuming the difference is quality of drivers? Which drivers are used in the least expensive 7 pi?

I want to build one of the models, and the 7 Pi corner horn looks interesting. Since I can't really get flush with my corners (3" out in one case) due to a windowsil and baseboard molding, is it possible to construct the corner horns without the triangular back plate, as long as the exact spacing to the back corner is maintained? My corner would, in effect, be the back plate.

Thanks, I'll have a lot more questions...