I'm thinking that the 1" compression driver may indeed be the way to go so I dont loose out on HF performance. But the reason I wanted the horn to go to ~500Hz and up is that the vocals are supposed to sound a lot better when coming from the one speaker. I know there are vocals below 500Hz but this is meant to be the best way to do reproduce them. Also, I didn't want half the vocals coming from a direct radiator (like a 12" or 15" to cover down to 70Hz or so with the horn) and the other coming from a wide dispersion horn, might make it sound a bit funny off-axis? Have you got any comments on this matter?

Cheers! Adrian