Marketing says yes, science, I don't know. Just like standing waves in a room, the lack of parallel sides in the cabinet are supposed to prevent standing waves inside the box. B&W's high end speakers use a similar approach. Not sure how much it actually helps, but I like the visual impact.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire