Thanks for the info, very informative. Seems this is a technology with great promise. Would the technology allow you to escape from the whole issue of adjusting for room acoustics for regular two channel stereo?
Yes and no I'd guess. Although I've never heard it in a normal listening room, I believe that in terms of imaging it would have a wider sweet spot than 2Ch stereo. But in every other respect you'd still have all the same room considerations as for 2Ch on the quality of the sound, i.e. the effects of room reflections, the speakers' polar response, room modes, etc.
And IIUC it works more effectively in a deader room / in the nearfield, so in that sense it may be more limiting. Although my experience towards the back and a bit off centre, in a concert space seating a few hundred people, was that it worked surprisingly well (better imaging than I think there would have been had just two channels been playing stereo from where I was seated, and very convincing 3D effect).
EDIT: all I'm saying I guess only applies to a well-executed system. I don't actually know whether this particular Yarra 3DX is as well-designed as the large PA system that I heard... Also, I was listening to music specific programmed to work on the WFS system. I have no idea whether something like this would work effectively when the input is 2Ch and some kind of processing is involved.