I've not experimented with the B&G's. Way too expensive for me.Thanks for you comments on my array. The spacing is 5 inches, which is clearly within the range of Jim's paper, especially since I'm using active crosses at 2500 and 24db/octave.
People who hit me on it haven't heard it, and haven't built one of these to MY specs.
Listening is fabulous.
Thanks again.
Marlboro