Aye. I've always speculated about how to kill someone with a sonic boom from a jet (variable speed so that ALL of the sound reaches a specific point at the same time), but I never got around to making the equation for the speed over time. Mostly because it would involve too much geometry (and possibly some calculus) and have altitude as a third variable. But I do think it would be possible to arrange multiple sound start points so that they all intersect at one point. OTOH, I'm not sure how much of an area effect it would have.