Hi Wayne. Thanks for the reply. I`m trying like a lot of folks to keep the cabinet size down to pacify the other half. I have an existing pair of homemade 2.5 cu ft bass reflex cabinets which i could retro fit the Pi 2 drivers into. Is this likely to work? They are well made cabinets with bracing and a 1.5" ply/mdf shell. I can adjust the port size. I`m wondering however if the horn drivers are better sounding than the piezo tweeters and if i should attempt some kind of a hybrid design. What do you think? Steve.