Adrian(or any of you other speaker gurus), I'm building a similiar project(built around a similiar midrange anyway, Im going to use an old magnavox 15" Alnico woofer for a while in an OB 'tll I build my bass horns),I was wondering what kind of tweeter are you going to use? I really wanted to build A conical tweeter with the same radiation pattern, but I've never seen a conical tweeter used. I do have a set of Coral tweeters that use a semiconical horn, but the mouth is rounded over(they reside in another speaker now). Currently I'm using some exponential magnavox horns with a 3"X9" mouth and alnico magnets. I damped the metal lens and it sounds pretty good(need some serious crossover work though--and I don't want to put the time into it if there is a better design out there that I can afford), but I really like the sound of the Corals and my midranges better. I don't know if its the shape of the lens, or the quality of the drivers. Do you think conicals would be worth the try? Thanks in advance for any input, I appreciate it.