For those looking for the "air" image sound of planer spkrs, try a pr of tweeters xover at 8K or so and place them in front of the mains such that they are way out of time alignment.
May have to pad them down a bit to taste.

Turn out the lights and listen to the sonic image.

A pr of KSN1016 piezos with 8 ohms across it works well.

Fun stuff to play with.

BTW, anyone aware of the Parts Express "NSB" drivers? I have a case of 'em here if anyone wants a pr to try out.