Here's my new diy open baffle speakers, EV SP12C's that I re-coned and modified in my simple open baffle design.
So far, I'm really impressed with their sound. A little bright, but for a 12" driver, the high end extension is amazing. No need for a tweeter, maybe some baffle step compensation though. Bass is tight and accurate, but they don't go down really low.
For $150 and a few hours of work, I can't ask for better sounding speakers. I'm definitely hooked on open baffles!