Right--the bipole-dipole is a finished design, albeit an expensive one. It has two Seas 5" magnesiums and 2 AC G2 ribbon tweets per side, with a phase toggle switch to change modes. It's quite a toy. As usual, I only got to hear one of them, but in its diffuse mode, you could place the speaker in the middle of a long wall and it would sound like there were two orchestras playing--one on each side of the room. Flip the switch, and you've got one orchestra in the middle. Flip the switch.................. I did a lot of flipping. I'm agnostic on whether you want a diffuse source on the sides and direct in the rear. It seems like it could make for some funny front-back pans if that happens very often in HT source material. But maybe it would sound great 99% of the time.