http://home.hetnet.nl/~geenius/index.html I posted a pick of these in another thread after I ran across them hoping some of those here with experience designing their own speakers would chime in with some opinions. Since that didn't happen I guess I'll start my own thread about them and see what the experts think. The efficiency of just one of those 6.5" drivers is higher than the tweeter. Is that a bad thing, or does it look like the crossover network has looked after it? The drivers are available from Madisound and would run you about $340 for a pair. Can someone give a guestimate as to how much the parts for the crossover designs provided would cost? This link has some better quality copies of the pictures in the other article: http://www.speakerbuilding.com/content/1105/ The crossover schematics are images 11 and 12. Any other random thoughts (beavers and ducks)?