"By acoustically isolating the two stereo channels, each ear hears only the correct stereo channel. The left ear hears left channel, and the right ear hears right channel"
The above is from their site. And from the look of the from the show above. Sound like they are super beamy speaker. So, they are made for only ONE listener.
I have Single Driver speakers based on 6" Fostex driver and they are pretty beamy. If I move my head just a few inches neither side or back and froth the sound will change. But look like Polk is taking this to the extreme with those two 5.25" and two 1" tweeter, I believe their canceling out any sound projected out to the sides and only a narrow beam of sound between them can be heard when you are sitting in the right spot. This is pretty much the opposite of what omnidirectional speakers like Bose 901 and etc try to do.
Very interesting. Would love to hear them just to see what is like.