An accidental discovery!
I'm up late, I'm bored, and so I decided to design another enclosure. I removed one of speaker drivers to put them in the new enclosure I'd be making tomorrow.
I rested it on a tall basket with a rug on top, and naturally they pointed up. I had the TV hooked up to them, and it was as if the sound wasn't coming from the driver! Usually with many speakers I'd have to close my eyes to fool myself. If I look directly at a pair of stereo speakers, I can tell even with a strong centre audio playback as if the stereo speakers are two mono sources.
But in this case, I am 3 feet away and I couldn't tell that the driver is making the sound. I have to have my face right up to it to break the illusion. I moved about in the room, sitting and standing and it's still invisible. Without the enclosure it was plasticky and thin, but the illusion is fantastic! Tried it with the other one but it didn't work. I suspect he position was off, and the condition wasn't correct. So the effect I got from the other driver is a fluke. Still though, I would like to recreate it again, in a multi-way configuration, like Linkwitz's Pluto.
If I could get it to work in stereo I wonder how the soundscape will be portrayed?