Hi all, my first post in the lab. Some of you may have seen my open baffle project in the ob section. I am running alpha 15" woofers, one in each baffle and 8" full range drivers. The bass is sublime and will be for keeps no matter what I attempt to do. The 8" full range drivers have a very flat response and sound wonderful unless the music gets busy. I was advised to install a tweeter and so limit the fr unit to a narrower band, say 100Hz ( as it is now ) to 4000Hz, maybe 3000Hz. I am going to try some spherical horns ( tractrix ) and BMS comression drivers, as they are not too expensive for an experiment and are of good quality, so I'm told. At present I use a 2 way digital crossover and bi-amp and with the tweeter installed I will be using a 3 way digital crossover and tri-amping. If this works I may consider running a spherical horn from 4000Hz down but most only go down to 300Hz and my Alpha's sound dreadful at 300Hz. I would say 150Hz is their limit. Any ideas what to do.