I could be all wet here, I don't know if it has something to do with the long winters here in the northern hemisphere that's given a number of us extra time to think about this, but it's interesting how a number of posts have all popped up at about the same time here recently concerning considering the high frequencies, dispersing of sound from speakers, speaker diffusion (which I started a post on) and so on. There's something a number of us are obviously all noticing that we feel needs to be addressed with our overall HW sound and for me I feel it mainly starts with the high frequencies that seem to need to be spread out more vs. the more focused form we are experiencing now regardless of our sound system of choice. How this is accomplished is the next question which I haven't yet quite figured out.
No experience with the bi-polar speakers mentioned here but I like the concept. The only issue I might have with them (like any speaker) is placing them too closely to you which may not give the desired results as it appears from what they describe although they would be fine as front speakers, their intention is more for good side or rear speakers which tells me regardless of how you decide to use them, for the best results you will want them some distance from you which in some cases may not be possible.
Marc