This past weekend I showed a speaker at RMAF that incorporates an unusual amount of adjustability.
Its frequency response curve can be "accurate" (approximately flat), or it can be "something else".
A significantly "something else" curve was preferred by a huge margin by those of us involved in setting up the room. We adjusted by ear (and I trusted younger ears more than my own). After the show I modeled what the response curve was after our adjustments, and it sloped gently downward by about 3 dB per decade north of 200 Hz. This isn’t news - this sort of curve has worked well for others.
Point being, the ears don’t necessarily perceive what the eye expects from looking at a curve.
Duke
dealer/manufacturer