NBS' E. V. A. and Butterfly speaker systems are freakishly awesome and horrifying all at the same time, especially with those pointed edges. Cause, really, I thought it was a bench.
The speakers aren't obvious: the woofer faces the floor, and the apertures are on the side. All the sound reaches the listener indirectly. The speakers range from $25,000 to a whopping $200,000 if you have the money to do a good deed and stimulate the economy, all by yourself.