I appreciate the input guys, but now I have gotten to listen to a pair of LaScala`s and how effortless they sound at higher listening levels compared to my Heresy`s and KG-4`s and I have been able to borrow a sub just to try it with both sets of speakers it sounds really good but still strained at highter volume levels so i`m gonna definately build Cornscala`s in the near future..... but I am still curious and hope to get some input about adding a passive or 2, to each cabinet. I will most likely build this as a 2 way system like Bob Crites but the horn will be in a seperate cabinet on top of the bass cabinet