Sounds like the speaker is so resolving/revealing that every microscopic movement makes a night/day type of a difference, as in, this is a "very" high level speaker that involves a ton of critical care and not just your average/typical (cost no option even) speaker that you can make work quite simply without too much work.
Actually, I agree with Kal Rubinson's evaluation (from his excellent review in Stereophile):
In regard to ease of placement in a domestic room not exclusively dedicated to listening, the S-1EX surpassed all other speakers I've used. This means that anyone who buys the Pioneer is more likely to enjoy optimum results than with more finicky speakers.
All speakers require proper setup and some rooms are trickier than others...to say the least! While the S-1EX's are indeed very resolving and detailed, they have not presented me with any difficult/unusual placement problems/issues as compared with other floor standers that I've had in my room. Since they are front-ported, they can be placed closer to the front wall (back wall to some folks) than the typical rear-ported floor standers.