A few months ago a friend of mine asked about replacing his aging PA. He was on a limited budget, and the idea of building some custom speakers came to mind. He had a wood shop, and was ready to make some saw dust. After a good amount of time designing things on paper and making minor tweaks, it was time to go. The attached image is what we came up with. Aside from foam backing the grills, they are done. The tops are a dual 12" and 2", and the subs are a single 18". The original top design called for the horn to be in the middle of the 12's, but he feared that he couldn't get the horns up high enough, so we settled for this.
So far, I'm very happy with my designs! The subs roll off nicely at 34hz, and the tops are solid from 76hz-16k. The rig's been out on a few gigs already, and it just sings. I keep forgetting to save SMAART traces, but hopefully I can get them posted soon. I was so happy with everything that I'm building 4 more subs currently!
Oh, and the whole system cost far less than what a system from a name brand would cost!