@alexberger and
@roxy54 --
"So when I go to friends or audio show I always hear compression from most of low sensitive speakers. Even big speakers like Wilson Audio. I feel it like a heavy, strained sound reproduction, unnatural, tiresome. Sound presses and it cause me a discomfort."
I really agree with this. Low sensitivity speakers don’t have the same sense of ease as high efficiency speakers, especially (but not exclusively) horn speakers.
I’d agree with this as well, although some of the "molasses"-like imprinting described, from my experience, is also a by-product of passive cross-overs, like a slight softening of the sound - a bit more smeared and less transparent, even. Most high efficiency speakers are passively configured also, but here the effect appears less pronounced.