My understanding is that the general thought being put forth was 'room acoustics make the music more sibilant.'
This simply isn't possible.
If i misunderstood then i stand corrected.
But if i did get the point right, a bright or rather a reflective room, will enhance all sound frequencies, not just S sounds, with our ears being more sensitive to those in the mid and upper range. The t, k, a, c, r, s, and [pick any hard sound letter] will all be highlighted.
That's why some guy screaming in a heavy metal song can really be blasting on the ears with good, forward speakers whereas some softer whispery music/vocals just sound fantastic and clear.
