How Sound Works in Rooms (from YouTube)

But the final sentence opens a whole can of worms: the use of diffusers and absorbers "make the sound more natural."   But there is nothing 'natural' about the best symphony hall (which itself is far from perfect), or studio, and we never experience music in such an environment.
BTW, The person who made the video has others. Haven't looked yet but sure to be interesting. Glad I helped someone...
Acoustic is a more "deep" subject than meet the eye ...Or more than rolled the waves ....

Why a ionizer(non ozone one) for example can modify the sound in a room?

There is a scientific explanation for sure but not in audio threads.... 😁