when I built my 2Pi's, I used the full thickness of R13 fibreglass insulation on three walls and used the recommended inductor, although the inductor affects the Alpha 10. They sound good. I also damped my tweeter "horn" later, just for the heck of it cause I had some extra Xtreme Dynamat, and it helped tighten up the bass and mids, to my surprise, and didn't really affect the high notes.

Good Luck!

Matts