We will have to disagree on this one. I do not see the corner as a prefered solution because I don't believe that it will work as well as you claim. Do you have any measurements to support you belief?

At what frequency do you cross over from LF to HF and how far away are these two sources? Obviuosly you would need more than a 2-way system to do this. Are the design details on you web site?

You claim that you can get a constant directivity across the spectrum with this approach? Even at the crossover points?