Just posted on the FR driver site, but I thought it would be appropriate for this site also. I have just completed my first fullrange 5.1 setup using Babb drivers, models 534 up front and 514s in the rear. All I can say is wow! These little things can sing. Off axis response is excellent. Coherency, soundstaging, its all there an its all good. I have not tried to get to reference volumes ..yet, but I think these guys can get there. The boxes are constructed of solid white ash, 3/4" thick. The blue cones are a nice touch.