another thing that causes "distortion" is a live room where there are lots of reflective surfaces and barely anything absorbtive or diffusive in the room.
when that happens, the reflected sounds are stronger than the direct sound and the whole thing turns to mush and is very irritating to the ears.
then, one finds it impossible to listen to a movie at Reference Level.
i may be wrong, but i think that most movies' audio tracks already incorporate all the necessary acoustic ambiance for an excellent reproduction, and does not need more contribution or reinforcement from
room surfaces. some reflections are very well acceptable, but the main source of sound should, whenever possible, be direct sound, with a weaker part of reflected sound, and that, mainly coming from the rear
of the room.