I've always read that one of the best tweaks you can perform on your speakers is with a 9" level, positioning them front to back and side to side dead level. I have experimented with slight (1-3 degrees) backward tilt on many different types of speakers I've owned in the past and always found the dead level method proved to be correct, at least to my liking.
However, today we see numerous speaker designs where all or some of the drivers are mounted on angled or sloped baffles, some even reversing slopes, and some fairly radical. What's up with that? Should we all now experiment with more radical tilted back positioning of our typical box/column loudspeakers? Are speaker designers purposly trying to throw the sound in a less direct (toward the listener) array in an effort to achieve a bigger soundstage, more ambience? Additionally, I've never heard any mention of the sonics of this new approach when speakers of this type are reviewed.